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Review
Q1 Maternal Cannabis Use during Lactation and Potential Effects on
Q13 Human Milk Composition and Production: A Narrative Review
Q12 Irma Castro-Navarro 1,*
, Mark A McGuire 2
, Janet E Williams 2
, Elizabeth A Holdsworth 3
,
Courtney L Meehan 4
, Michelle K McGuire 1
1 Q2 University of Idaho, Margaret Ritchie School of Family and Consumer Sciences, Moscow, ID, United States; 2 Department of Animal, Veterinary,
and Food Sciences, University of Idaho, Moscow, ID, United States; 3 Department of Anthropology, the Ohio State University, Columbus, OH, United
States; 4 Department of Anthropology, Washington State University, Pullman, WA, United States
ABSTRACT
Cannabis use has increased sharply in the last 20 y among adults, including reproductive-aged women. Its recent widespread legalization is
associated with a decrease in risk perception of cannabis use during breastfeeding. However, the effect of cannabis use (if any) on milk
production and milk composition is not known. This narrative review summarizes current knowledge related to maternal cannabis use
during breastfeeding and provides an overview of possible pathways whereby cannabis might affect milk composition and production.
Several studies have demonstrated that cannabinoids and their metabolites are detectable in human milk produced by mothers who use
cannabis. Due to their physicochemical properties, cannabinoids are stored in adipose tissue, can easily reach the mammary gland, and can
be secreted in milk. Moreover, cannabinoid receptors are present in adipocytes and mammary epithelial cells. The activation of these re- ceptors directly modulates fatty acid metabolism, potentially causing changes in milk fatty acid profiles. Additionally, the endocannabinoid
system is intimately connected to the endocrine system. As such, it is probable that interactions of exogenous cannabinoids with the
endocannabinoid system might modify release of critical hormones (e.g., prolactin and dopamine) that regulate milk production and
secretion. Nonetheless, few studies have investigated effects of cannabis use (including on milk production and composition) in lactating
women. Additional research utilizing robust methodologies are needed to elucidate whether and how cannabis use affects human milk
production and composition.
Keywords: cannabis, breastfeeding, breastmilk, milk composition, cannabinoids, cannabinoid receptors, human milk, lactation, peroxisome
proliferator-activated receptors, prolactin
Statement of Significance
To our knowledge, no review has focused on the potential effects of maternal cannabis use on human milk composition and production. The
evidence provided here supports the possibility that, through several well documented pathways, cannabinoids might alter lipid metabolism in
the mammary gland, as well as milk production and secretion. Considering the recent increase in cannabis use among reproductive-aged women,
this narrative review highlights the need for well-designed, focused studies to address this question.
Abbreviations: 11-OH-THC, 11-hydroxy-tetrahydrocannabinol; AEA, N-arachidonoylethanolamide or anandamide; CBD, cannabidiol; CB1R, cannabinoid type 1
receptor; CB2R, cannabinoid type 2 receptor; CLA, conjugated linoleic acid; ECS, endocannabinoid system; FABP, fatty acid-binding protein; GH, growth hormone;
GPR, G protein-coupled receptor; MEC, mammary epithelial cell; NSDUH, National Survey on Drug Use and Health; PPAR, peroxisome proliferator-activated receptor;
PRL, prolactin; THC, Δ-9-tetrahydrocannabinol; THC-COOH, carboxy-tetrahydrocannabinol.
* Corresponding author. E-mail address: irma@uidaho.edu (I. Castro-Navarro).
journal homepage: https://advances.nutrition.org/
https://doi.org/10.1016/j.advnut.2024.100196
Received 18 December 2023; Received in revised form 20 February 2024; Accepted 22 February 2024; Available online xxxx
2161-8313/© 2024 The Author(s). Published by Elsevier Inc. on behalf of American Society for Nutrition. This is an open access article under the CC BY license
(http://creativecommons.org/licenses/by/4.0/).
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Methods
The research to write this narrative review was initially
performed using PubMed and Google Scholar databases. The
preliminary search included the terms “cannabis,” “marijuana,”
“lactation,” “human milk,” and “breastfeeding.” Additional
searches were conducted by looking for specific concepts
addressed in each section. Articles cited in the papers obtained
during the searches were also included. No restriction on the
time of publication was established.
Overall Trends in Cannabis Use
Cannabis (Cannabis sativa, Cannabis indica, and Cannabis
ruderalis; often referred to collectively as marijuana) is one of the
world’s most commonly used drugs, with >200 million people
using it in 2020 [1]. Cannabis use is increasingly legalized in
many regions around the globe, including numerous states in
United States. California became the first state in the United
States to allow medical use of cannabis in 1996. As of 2023, 21
states, 3 territories, and the District of Columbia have legalized
recreational cannabis use, and an additional 16 states have
regulated cannabis for medical use [2]. The use of this plant and
its derivatives among adults has spread in conjunction with its
legalization. In 2002, the Substance Abuse and Mental Health
Services Administration reported that 6.2% of the population in
United States used cannabis in the previous year [3]. Cannabis
use in the United States has nearly tripled since that time and was
reported to be 18.7% in 2021 with the greatest prevalence
(35.4%) among young adults aged 18– 25 y [3].
Not only has the prevalence of cannabis use increased, but
variation in cannabis products offered and the potency of those
products is greater than ever. Historically, smoking dried
cannabis flowers containing Δ-9-tetrahydrocannabinol (THC),
the major psychoactive cannabinoid, was the most common
method and product used. However, a notable variety of
cannabis products, developed from processed raw cannabis, are
now available (Table 1) [4–10], providing a wide diversity of
modes of use [11]. Data from Washington State’s cannabis
traceability system named Cannabis Central Reporting System
(https://lcb.wa.gov/ccrs) shows that, although cannabis flower
was still the most purchased product between 2014 and 2016
(accounting for two-thirds of expenditures), cannabis extracts
sales increased 145% in that period [6].
Potency of cannabis products, typically quantified as per- centage of THC per weight of product, has also increased in
recent decades. Several studies analyzing THC content in mari- juana dry flower in the United States reported an increased po- tency of >10% in the last decade [6,12–14]. This increase in THC
content may be a response to the rising demand for high-dose
THC products [14,15]. For example, the sale of high-dose THC
(>20% THC per weight) flower strains grew 50% between 2014
and 2016 in Washington State. An increase was also observed for
the sale of cannabis extracts, for which average THC potency is
triple that of products made from the cannabis flower [6]
(Table 1).
Cannabis Use by Reproductive-Aged Women
Although cannabis use is more prevalent among men than
women, this gender gap is narrowing; 42% of people who use
cannabis in North America are women, which is the highest
proportion worldwide [1]. This relatively high-usage rate among
North American women includes their reproductive years and
during pregnancy and lactation [16,17]. The National Survey on
Drug Use and Health (NSDUH) from 2002 through 2014
included surveys from of 200,510 women, 18–44 y of age. The
population was described as 61% White, 17.2% Hispanic, 13.7%
Black, and 8% other race/ethnicity; 59% had some college ed- ucation; and 55.9% had annual family incomes <$50,000.
Among the 10,587 pregnant women included in this survey,
prevalence of past-month use of cannabis increased 62.4% be- tween 2002 and 2014, although the frequency of use within this
population was low (<4%) [17]. Data collected in the NSDUH
also indicated that use rates during pregnancy increased sub- stantially from 3.4% to 7.0% between 2002 and 2017, with the
highest prevalence of daily marijuana use reported during the
first trimester [18]. The 2017 annual Pregnancy Risk Assessment
Monitoring System recorded information about the prevalence of
cannabis use during the postpartum period in 7 states (Alaska,
TABLE 1
Summary of cannabis products, routes, and modes of use; average Δ-9-tetrahydrocannabinol concentrations; and average amount of Δ-9-tetra- hydrocannabinol (mg) in a unit or package
Cannabis product1 Route of administration Mode of use THC concentration (THC % per weight of product)
or total THC in product (mg/unit or mg/package)
Flowers (i.e., bud, dried herb) Inhaled (smoked) Cigarettes, joints, blunts, pipes, bongs 22% [4]; 14%–18% [5]; 21% [6]; 20% [7]
Hash, resin, kief Inhaled (smoked) Cigarettes, joints, blunts, pipes, bongs 44%, 71%, and 34%, respectively [4];
hash/kief 41% [7]
Liquid concentrates
(oil, tinctures), dried herb
Inhaled (vaped) Cartridges, vape pens 59%–74% [4]; 69% [6]; 68% [7]
Solid or semisolid concentrates
(shatter, wax)
Inhaled
(flash vaporized)
Dabs, slang 75% [4]; 73% [7]
Concentrates infused Oral Edibles (candy, baked goods,
sublingual sprays, drinks, capsules)
2–8 mg/unit [4]; 0.01–99.1 mg/unit [8];
capsules 5–90 mg/unit; baked goods
8.4–50.6 mg/unit [9]; median through
products 1⁄4 10–25 mg/unit [10]
Concentrates infused Transdermal Lotions, balms, gels, patch 69 mg/unit [4]; 5 mg/unit [10]
Concentrates infused Rectal or vaginal Suppositories 240 mg/package [10]
1 Most popular cannabis products used by route/mode of administration; cannabis products can be adapted for use through different modes.
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Illinois, Maine, New Mexico, New York, Pennsylvania, and West
Virginia). They reported that overall prevalence of marijuana use
among 4604 postpartum participants was 5.5%, with 4.1% of
breastfeeding women reporting current use [19].
In contrast to overall usage trends, which are on the upswing,
the perception of the dangers of cannabis use among women of
reproductive age has declined [16,20–22]. In fact, cannabis
products are occasionally viewed as representing a less harmful,
more effective substance compared with over-the-counter and
prescription medications [23,24]. Indeed, cannabis and
cannabis-based products (containing THC) are often used
[24–26]—and some dispensaries are advising them—for treat- ment of pregnancy-related morning sickness [27]. During
breastfeeding, the main reasons reported by women for using
cannabis include the treatment of health problems such as anx- iety, depression, gastrointestinal problems (e.g., loss of appetite
and nausea), chronic pain, and posttraumatic stress disorder [28,
29].
Although very little is known about the potential effect of
maternal cannabis use during pregnancy and lactation on the
infant, THC has been detected in meconium of infants of mothers
who use cannabis [30–32] and in human milk [33–38], clearly
indicating that the infant can be exposed to this and other
compounds found in cannabis or metabolites thereof. Multiple
studies in the last decade have associated prenatal cannabis
exposure to negative newborn outcomes, such as low birth- weight, preterm birth, or higher neonatal intensive care unit
admission rates [32,39–43]. Longitudinal cohort studies have
also associated prenatal cannabis exposure with poorer perfor- mances in verbal activities, short-term memory, or attention in
infants and young adults [44–46]. However, inconsistent results
have been observed in academic achievement, and it has been
suggested that maternal/infant socioeconomic status might be
mediating some of the relationships reported with poorer per- formance [47,48]. Nonetheless, research will need to be con- ducted to rigorously evaluate different forms of cannabis use
(smoking, vaping, or ingesting) and to control for the amount of
cannabis used to elucidate if there is a dose–response effect of
prenatal cannabis exposure on infant outcomes.
There are even fewer studies evaluating the potential effects
of maternal cannabis use on the infant during breastfeeding, and
these studies have substantial limitations in that they include
low numbers of participants and the co-use of alcohol, tobacco,
and other drugs [49]. The scientific literature regarding the po- tential risks and benefits of cannabis use during breastfeeding is
extremely limited and does not provide clear guidance [50]. Due
to the limited evidence of effects of perinatal cannabis use, it is
unclear whether the benefits of breastfeeding outweigh the po- tential risks of exposure to THC or its metabolites via breast milk.
Organizations, such as the American Academy of Pediatrics,
American College of Obstetricians and Gynecologists, the Acad- emy of Breastfeeding Medicine, and the United States FDA
recommend reduction or cessation of cannabis use by pregnant
and breastfeeding women [49,51–53]. Nonetheless, it is clear
with the increasing cannabis use trends that these organizations’
recommendations are not being followed. Furthermore, these
recommendations are generally based on lack of evidence and
extreme caution (precautionary principle) rather than scientific
evidence of harm.
Pharmacokinetics of Cannabinoids and Their
Incorporation into Human Milk
Cannabinoids are grouped into 1 of 3 categories depending on
their origin. They are referred to as phytocannabinoids if derived
from the plant Cannabis sativa, endocannabinoids if produced in
the human body, and synthetic cannabinoids if they are manu- factured as “designer drugs” that bind to the cannabinoid re- ceptors. To date, 125 cannabinoids have been isolated from the
Cannabis sativa plant [54], among which THC and cannabidiol
(CBD) are the most abundant and well-studied. THC is the
compound in cannabis that produces many of its psychoactive
effects, whereas CBD is a nonpsychoactive cannabinoid reported
to have medicinal (e.g., analgesic, antispasmodic, and
anti-inflammatory) properties [55,56].
The timing of cannabinoid appearance in the circulatory
system after cannabis use varies widely and depends on the route
of administration. Peak plasma THC concentration is achieved
faster (within 3–10 min), and maximum concentrations in
plasma are higher when the cannabis is inhaled compared with
when it is ingested [56,57]. The amount of cannabinoids that can
reach the circulatory system after inhalation ranges from 10% to
50% of the total present in the product used, although there is
high interindividual variability related to depth of inhalation,
puff duration, and length of breath hold [58,59]. When cannabis
products are ingested, the appearance of THC in blood is slower,
typically resulting in maximal circulating concentrations after 1
h [9].
Approximately 90% of the THC in blood is partitioned into
the plasma compartment, where it is almost entirely found
bound to low-density lipoproteins [58]. Once in the blood,
cannabinoids rapidly redistribute into well-vascularized organs
and, due to their lipophilic nature, can easily be distributed to
adipose tissue (Figure 1). Indeed, adipose tissue may be the
major long-term accumulation depot, where fatty acid conju- gates of THC and 11-hydroxy-tetrahydrocannabinol
(11-OH-THC) may be formed, increasing their stability and
reaching adipose-to-plasma ratios of up to 104:1 [58,59].
Therefore, it is highly likely that the amount and distribution of
stored cannabinoids is affected by body composition [56], but
results from the few studies that have investigated this have not
been conclusive, as described below.
Ewell et al. [60] explored the potential association between
body composition and pharmacokinetics of circulating THC after
consumption of different edible marijuana products and found
that none of the body composition characteristics (including age,
height, bone mineral content, BMI, fat percentage and fat, and
lean and total mass) were consistently related to pharmacoki- netic parameters for any product. Wong et al. [61] assessed the
potential effect of exercise on plasma concentrations of THC in
people who regularly use cannabis and detected a positive cor- relation between BMI (generally used as an indirect indicator of
adiposity) and exercise-induced increased concentration of
plasma THC. Whereas higher BMI might represent greater adi- pose tissue mass (which could therefore store greater amounts of
lipophilic cannabinoids), high BMI can also reflect greater
muscle mass. Therefore, more studies are needed to describe
how body composition, as assessed by more sophisticated
methods such as dual x-ray absorptiometry, might influence
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cannabinoid pharmacokinetics and whether these relationships
are similar across the lifespan. Indeed, pregnancy and lactation
are stages of particular interest to this concern. The significant
changes in body fat mass that occur during pregnancy and
lactation may have different effects on THC circulation than
static body fat mass.
In addition to their high lipid-solubility, cannabinoids have a
small molecular weight (314.46 g/mol), allowing them to
transfer into and become concentrated within lipid-rich tissues,
such as the breast [34] (Figure 1). Indeed, several studies
[33–38,62,63] have demonstrated the presence of phytocanna- binoids and their metabolites in human milk (Table 2). Relative
incorporation of cannabinoids into milk appears to be different
depending on time postpartum. During the first days of lactation,
milk-producing mammary epithelial cells (MECs, sometimes
referred to as lactocytes) are small, and the spaces between them
are wide. These wide intercellular gaps allow leukocytes, Ig,
proteins, and drugs (including cannabinoids) to transfer easily
from the mother’s circulation into the milk [64]. Once the
intercellular gaps (sometimes referred to as leaky tight junctions)
are reduced in size, the transfer of drugs and other large mole- cules into the milk occurs by passive or facilitated diffusion down
their concentration gradients [65].
The passage of drugs into milk is affected by many additional
factors, such as acid–base dissociation constant (pKa) and pro- tein binding [64]. Due to its lipophilic nature and small molec- ular weight, THC transfers particularly readily into milk. A
pharmacokinetic study carried out by Baker et al. [33]
demonstrated that, after maternal cannabis inhalation, 2.5%
(range: 0.4%–8.7%) of the THC dose was secreted in the milk.
Once in milk, THC can be partially ionized because of its basic
pKa (10.6) and is therefore not able to pass back into maternal
plasma through passive diffusion even when its concentration is
greater in milk than in maternal plasma [65]. This phenomenon
leads to accumulation of THC in the milk, explaining the high
milk-to-plasma ratios (up to 8:1) reported previously [36,38].
Moreover, cannabis metabolites stored in adipose tissue may
have a slow release into the blood circulation and eventually
milk during lactation because these compounds can be detected
in milk from women who frequently use cannabis (>2 times/wk)
even after several weeks of abstention [38].
THC circulates through the body via the bloodstream, even- tually reaching the liver. Metabolism of THC includes hydrox- ylation in the liver through cytochrome P450, resulting in
11-OH-THC, which also has psychoactive effects. Plasma
concentrations of 11-OH-THC after oral ingestion are greater
than those observed in the plasma after smoking cannabis [58].
Degradation of THC by gastric secretions (e.g., hydrochloric
acid), combined with first-pass liver metabolism, reduces
bioavailability of THC to 6%–7% of the ingested dose
[58,59]. Further oxidation of 11-OH-THC produces
carboxy-tetrahydrocannabinol (THC-COOH), which is eventu- Q3
ally glucuronidated [58]. Most of the cannabinoids and their
metabolites are excreted in feces (65%–80%), with the
remainder in urine (20%–35%) [57]. The metabolites excreted
in feces—mainly in the form of nonconjugated metabolites—can
FIGURE 1. Absorption, transport, and metabolism of cannabinoids, including the most common routes of administration (inhaled and ingested) in
relation to their presence in milk. Abbreviations: 11-OH-THC, 11-hydroxy-tetrahydrocannabinol; THC-COOH, carboxy-tetrahydrocannabinol;
THC, Δ-9-tetrahydrocannabinol. Created with BioRender.com. Q11
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TABLE 2
Published research reporting concentrations of cannabinoids and their metabolites in milk produced by women who use cannabis.
Reference n Timing and
frequency of
cannabis use
Milk collection methodology Cannabinoids and
metabolites
concentrations in
milk, median (IQR) or
specified units
Time PP Excl. BF Collection
method
Collection
time
Full exp. Single/
both
breast
Perez-Reyes and
Wall, 1982 [36]
2 Subject 1: 1/d
Subject 2: 7/d
7–8 mo NR NR NR NR NR Subject 1: 105 ng/mL
THC; 11-OH-THC and
9-carboxy-THC were
not detected.
Subject 2: 340 and 4
ng/mL THC and 11-
OH-THC, respectively;
9-carboxy-THC not
detected.
Marchei et al.,
2011 [62]
1 NR NR NR NR NR NR NR 86 and 5 ng/mL THC
and 11-OH-THC,
respectively.
Baker et al., 2018
[33]
8 0.025–1 g/d
Abstained for 24 h
before using 0.1 g
of dry flower
3–5 mo Yes Pump 20 min and
1, 2, and 4
h after use
- Both Mean and maximum
(1 h after use) THC:
53.5 and 94 ng/mL,
respectively.
Bertrand et al.,
2018 [34]
50 88% of subjects
used at least daily
2/3 of
women
<1 y
NR NR NR Yes NR THC: 9.47 (IQR:
2.29–46.78) ng/mL (n
1⁄4 34)
11-OH-THC: 2.38
(IQR: 1.35–5.45) ng/
mL (n 1⁄4 5)
CBD: 4.99 (IQR:
2.92–5.97) ng/mL (n
1⁄4 5)
Moss et al., 2021
[35]
20 Used daily. Last
use <48 h before
sample collection
<2 mo NR NR 2 wk and 2
mo PP
No NR THC: 27.5 (IQR:
0.9–190.4) ng/mL (n
1⁄4 34)
11-OH-THC: 1.4 (IQR:
0.7–5.2) ng/mL (n 1⁄4
5)
THC-COOH: 1.9 (IQR:
0.5–16.6) ng/mL (n 1⁄4
18)
CBD: 1.2 (IQR:
0.5–17.0) ng/mL (n 1⁄4
13)
Sempio et al.,
2021 [37]
30 Used during
pregnancy;
frequency not
provided
NR NR NR NR NR NR THC: 8.08 (range:
0.84–130) ng/mL (n 1⁄4
30)
11-OH-THC: 1.94
(range: 1.66–2.42)
ng/mL (n 1⁄4 5)
THC-COOH: 1.30
(range: 2.05–2.98)
ng/mL (n 1⁄4 7)
Wymore et al.,
2021 [38]
25 Prenatal use >2
times/wk
1–6 wk NR NR Through
first 6 wk
PP
NR NR THC in all samples:
3.2 (IQR: 1.2, 6.8), 5.5
(IQR: 4.4, 16.0), and
1.9 (IQR: 1.1, 4.3) ng/
mL in 1, 2, and 6 wk,
respectively
Josan et al., 2022
[63]
13 Daily use during
pregnancy (n 1⁄4
12) and PP period
(n 1⁄4 8)
6–8 wk NR Pump From daily
or weekly
pumped
NR NR THC: 22 (range:
0.625–503) ng/mL (n
1⁄4 13)
11-OH-THC: 6 (range:
4–22) ng/mL (n 1⁄4 3)
THC-COOH: 2.6
(range: 1.6–5.9) ng/
mL (n 1⁄4 5)
Abbreviations: 11-OH-THC, 11-hydroxy-tetrahydrocannabinol; BF, breastfeeding; CBD, cannabidiol; excl., exclusively; exp., expression; IQR,
interquartile range; NR, not reported; PP, postpartum; THC, Δ-9-tetrahydrocannabinol; THC-COOH, carboxy-tetrahydrocannabinol.
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be detected for over a week after use [66–69]. Conversely,
metabolites in urine are mainly excreted in conjugated form,
and a single dose of THC may result in measurable metabolites
in urine for 12 d. Nevertheless, substantial differences can be
observed in the period of excretion depending on use frequency;
although cannabis cannabinoid metabolites can be detected in
urine for (on average) 8.5 d after use in people who occasionally
use cannabis, average time for excretion is 19 d in people who
frequently use cannabis [58].
Cannabinoid Receptors in Mammary Epithelial
Cells
The physiologic and psychoactive effects of cannabis use are a
result of the interaction of phytocannabinoids with the endo- cannabinoid system (ECS). This system is composed of canna- binoid receptors (detailed below), their endogenous ligands
(mainly anandamide [N-arachidonoylethanolamide [AEA]) and
2-arachidonoylglycerol) and the enzymes responsible for endo- cannabinoid synthesis, reuptake, and degradation (fatty acid
amide hydrolase and mono-acyl glycerol lipase) [70].
The main receptors in this system are G protein-coupled re- ceptors (GPRs) referred to as cannabinoid type 1 receptors
(CB1Rs) and cannabinoid type 2 receptors (CB2Rs), although
cannabinoids can also bind to GPR55, GPR18, GPR3, GPR6, and
GPR12. CB1R is particularly abundant in certain regions of the
central nervous system, such as the frontal cortex, hippocampus,
basal ganglia, and cerebellum. Decreased presence of CB1R in
the central nervous system is associated with disruption of its
many roles such as control of motor function, cognition and
memory, and analgesia [71]. Some studies also provide evidence
for presence of CB1R in peripheral tissues, such as adrenal
glands, pituitary gland, heart, lung, prostate, liver, uterus, ovary,
testis, bone marrow, thymus, and tonsils [72–74], as well as
adipose tissue, pancreas, and skeletal muscle [75]. Conversely,
CB2Rs are abundantly present in peripheral organs and cells with
immune function, including macrophages, the spleen, tonsils,
thymus, and leukocytes, as well as the lungs and testes [71].
The presence of CB1R and CB2R in MECs has been described
mostly in studies related to breast cancer, as CB2R is overex- pressed in some subtypes of mammary gland tumors [76]. Only a
limited number of studies, however, have reported the presence
(or absence) of cannabinoid receptors in MECs of healthy
women. Josan et al. [77] detected a higher expression of the
cannabinoid receptor 2 gene (CNR2) in differentiated HC11 cells
(a mouse MEC line) than in undifferentiated cells. Regarding
human cell lines, Caffarel et al. [78] evaluated expression of
CB1R and CB2R in healthy human MECs as well as in several
human breast cancer cell lines by real-time quantitative PCR and
confocal microscopy. Higher concentrations of CB1R mRNA
were detected in healthy MECs compared with cancerous breast
tissue, whereas the opposite was observed for CB2R mRNA.
Qamri et al. [79] also investigated the presence of CB1R and
CB2R in healthy human MECs and several breast cancer cell lines
using tissue microarray. Expression of both receptors was
detected in all cancer cell lines assessed as well as in healthy MEC
samples. However, they reported a higher percentage of CB1R
and CB2R staining in breast cancer cell lines (28% and 35%,
respectively) than in healthy MECs (3% and 5%, respectively).
The expression of the cannabinoid receptor genes CNR1 and
CNR2 in lactating human MECs has been proved in a limited
number of studies [80,81]. Lemay et al. [81] sequenced mRNA
found in the milk fat layer from 3 colostrum, 5 transitional, and 8
mature milk samples. CNR1 and CNR2 genes were expressed in 1
colostrum sample and 1 mature milk sample, respectively. Twig- ger et al. [80] analyzed mammary cells isolated from human milk
(n 1⁄4 8) and nonlactating mammary tissue (n 1⁄4 7) using single-cell
transcriptomic methodology. Although the expression of CNR1
was low overall, higher expression was observed in nonlactating
mammary tissue samples than in human milk samples. Expression
of CNR2 was low and similar in both groups of samples [80].
Further research with a larger number of samples is necessary to
disclose if and how the expression of CNR1 and CNR2 might be
affected by the lactation process.
Cannabinoids can also bind to peroxisome proliferator- activated receptors (PPARs) [57,82], a family of nuclear hor- mone receptors (including isoforms α, β/δ, and γ) that can bind
to DNA sequences, leading to changes in the transcription of
target genes. Although PPARs are primarily activated by unsat- urated fatty acids [83], it has been suggested that cannabinoids
can also activate PPAR in different ways. For example, canna- binoids can 1) be transported intracellularly by fatty
acid-binding proteins (FABP) and activate PPAR directly; 2)
activate surface cannabinoid receptors causing intracellular
signaling cascades that lead to the activation of PPAR indirectly;
and 3) be metabolized into cannabinoid metabolites, which can
activate PPAR [84–86].
PPARs have been detected mainly in adipose tissue and, to a
lesser extent, in mammary tissue of several species. Studies in
cattle have demonstrated that the gene peroxisome proliferator- activated receptor γ (PPARG) is highly expressed in adipose tis- sue and moderately expressed in mammary tissue and in a
mammary epithelial cell line (MAC-T) [87,88]. Moreover,
expression of PPARG in the mammary gland increases during
pregnancy and lactation [88,89]. The PPARG gene has been Q4
found to be expressed also (in low-to-moderate amounts) in
lungs, spleen, ovaries and, at very low concentrations, in liver,
kidneys, leukocytes, and small intestine [87,90,91]. In mono- gastrics such as mice and humans, PPARG is also highly
expressed in adipose tissue [92–95].
The expression of the gene peroxisome proliferator-activated
receptor α (PPARA) is more widespread among tissues and cells
than that of PPARG. The highest expression of PPARA has been
described in the kidney and liver, followed by adipose tissue,
small intestine, and semitendinosus muscle in dairy cattle.
Mammary glands of cattle have a relatively modest expression of
PPARA [90]. PPARβ/δ is the least studied PPAR isotype. Bionaz
et al. [90] observed similar expression of the gene peroxisome
proliferator-activated receptor δ (PPARD) in all bovine tissues
and cells assessed (including adipose tissue, rumen, jejunum,
liver, kidney, muscle, hoof, lung, mammary gland, and placenta).
Expression of PPARD in bovine mammary cells has also been
demonstrated by others [96].
As mentioned above, cannabinoids can be transported
intracellularly bound to FABPs, proteins that mainly mediate
the cytosolic movement of lipids [86]. FABPs are found in
numerous cell types of mammalian tissues involved in the up- take and/or utilization of fatty acids [97]. Indeed, high
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concentrations of FABPs have been found in rat [98,99] and
bovine [100] mammary tissue.
In addition, transient receptor potential channels are highly
selective epithelial calcium (Ca2þ) channels involved in ionic
homeostasis and cellular signaling [101]. Cannabinoids can bind
to members of the transient receptor potential vanilloid channel
subfamily expressed in healthy human breast tissues [102].
Cannabinoids can also bind to monoamine transporters, adeno- sine equilibrative nucleoside transporters, and glycine receptors
[57,82] whose possible effects on lactogenesis and milk syn- thesis are currently unknown.
As previously discussed, there are several pathways through
which cannabinoids might interfere with MEC function. How- ever, the mammary gland is a complex matrix made up of MECs,
stroma cells, adipose tissue, blood and lymphatic vessels, and
nerve tissue [103]. Consequently, studying the effects of can- nabinoids in isolated MECs does not fully replicate the envi- ronment of the human mammary gland. Indeed, use of a more
naturalistic and complex tissue matrix that includes adipose cells
would be more translatable. The use of organoids, for example, is
an important model for human mammary gland research [104]
because 3-dimensional mammary organoid models reproduce
extracellular conditions, maintain spatial morphology, and could
be cocultured with adipocytes and other stromal components
[104]. Moreover, organoids can be maintained in controlled
medium, thus inducing the lactating conditions and in turn
making it possible to understand the effects of cannabinoids on
the full scope of the lactating mammary gland [105,106].
Effects of Cannabinoids on Milk Composition
Roles of the ECS include regulating several physiologic pro- cesses such as homeostasis and energy balance, as well as mod- ulation of numerous neuro-processes, including anxiety, feeding
behavior/appetite, emotional behavior, depression, neuro- genesis, neuroprotection, reward, cognition, learning, memory,
and pain sensation [55,107]. Regarding the possible relationship
of the ECS with milk composition, one of the most closely linked
potential roles of the ECS is its likely modulation of lipid
metabolism. This is because modulation of lipid metabolism is
carried out in part through direct activation of PPARs or through
the activation of cannabinoid receptors (Figure 2), which in turn
triggers a cascade of reactions that ultimately activate PPARs
(108). PPARs activated by cannabinoid form a heterodimer with
the retinoid X receptor (RXR). This PPAR/RXR complex can bind
to specific response elements in the DNA, in turn regulating
expression of target genes involved in lipid metabolism and cell
differentiation [109]. PPARγ is upregulated in mammary tissue
during lactation, suggesting an essential role in regulation of
milk fat synthesis [110].
In addition, the endocannabinoid AEA acts as an agonist of
both CB1R and PPARγ, causing adipocyte differentiation and
lipid accumulation [111,112]. Treatment of mouse 3T3-F442A
preadipocytes with the CB1R receptor agonist HU210—a syn- thetic cannabinoid—increased the concentration of PPARγ and
the accumulation of lipid droplets [113]. The same effect was
observed after treating mouse adipocytes with AEA; increased
PPARG2 gene expression and CB1R protein content were
observed compared with untreated cells [112]. Moreover, acti- vation of adipocyte CB1Rs in mice stimulates lipoprotein lipase
activity [114]. This enzyme plays an important role in milk fat
synthesis as it regulates the hydrolysis of circulating triglyceride
and the uptake of fatty acids in the mammary gland [115].
Accordingly, blocking CB1R binding in adipose tissue increases
lipolysis, decreases lipogenesis, and increases the oxidation of
fatty acids inside the adipocyte [108].
In addition to endocannabinoids, some polyunsaturated fatty
acids such as some isomers of conjugated linoleic acid (CLA) can
act as natural PPARγ ligands. Indeed, the effect of t10c12-CLA on
lipid milk composition—both in animals and humans—has been
described previously. More specifically, treatment with PPARγ
ligand t10c12-CLA has a clear negative effect on lipogenic net- works in several species such as cattle [91,116], mice [117],
goats [118], and humans [119].
Whether cannabinoids have the same effect is currently un- known, but as described above, cannabinoids might modulate
milk macronutrient composition, especially lipid and fatty acid
content, by activating cannabinoid receptors and/or PPARγ.
FIGURE 2. Putative effects of cannabinoids in mammary epithelial cells and secretion of cannabinoids in milk. Abbreviations: CBR, cannabinoid
receptor; FA, fatty acid; FABP, fatty acid-binding protein; PPAR, peroxisome proliferator-activated receptor; RXR, retinol X receptor; TRPV,
transient receptor potential vanilloid. Created with BioRender.com.
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However, only a limited number of studies have addressed the
direct effect of phytocannabinoids on milk composition, and
additional rigorous research is warranted.
In a recent in vitro study, the effect of THC and CBD on milk
production was investigated using HC11 cells (a MEC line iso- lated from mice). After treating HC11 cells with different
amounts of either THC or CBD, reduced transcription (lower
mRNA concentrations) of the protein synthetic genes casein β
(CSN2) and whey acidic protein was observed for both canna- binoids. THC and CBD treatments also decreased expression of
several genes related to lipid metabolism (fatty acid synthase
[FASN], fatty acid-binding protein 4 [FABP4], glucose trans- porter 1 [GLUT1], hexokinase 2 [HK2], perilipin 2 [PLIN2], and
lipoprotein lipase [LPL]) and reduced overall lipid concentra- tions [77]. These results suggest that cannabinoids may affect
human milk macronutrient composition. However, the effect of
cannabis or its metabolites on the lactating mammary gland
needs to be confirmed with in vivo and clinical studies.
In humans, only one study has investigated the association
between cannabis use and milk composition. In the study con- ducted by Josan et al. [63], a single milk sample was collected
from 19 breastfeeding women who used cannabis and 17
breastfeeding women who did not use cannabis over 6–8 wk
postpartum. The participants provided 2 ounces of milk from
their daily or weekly expression, using either manual or electric
pumps. Milk samples were analyzed for several cannabinoids by
HPLC-mass spectrometry; lactose using an ELISA kit; and lipids,
total carbohydrates (as sum of lactose and oligosaccharides), and
crude protein (including nonprotein nitrogen and true protein)
from nitrogen content using a Miris Human Milk Analyzer. No
differences were observed in concentrations of lipids, total car- bohydrates, crude protein, or true protein in milk produced by
women who used compared with those who did not use
cannabis. However, lactose concentrations were higher in the
milk produced by women who used only cannabis (not mixed
with tobacco) compared with those of women who did not use.
When controlling for cooccurrence of tobacco use, milk pro- duced by women who used cannabis and tobacco had lower
concentrations of total carbohydrates and higher concentrations
of crude and true protein [63]. Because sampling details were
not provided (unknown amount of foremilk and hindmilk) and
timing of sampling was not controlled for a variety of important
factors (e.g., time of day and time since last feed) related to
variation in milk composition (e.g., lipid content), these data
should be interpreted with caution. In addition, time since last
cannabis exposure was not recorded. Clearly, additional
well-controlled studies are needed to understand the potential
effects of maternal cannabis use on milk composition.
Maternal Cannabis Use and Milk Production
The endocrine system is responsible for regulating lactation,
including mammogenesis (development of the mammary gland),
lactogenesis (establishment of lactation), and galactopoiesis
(maintenance of milk secretion). Milk production is controlled by
prolactin (PRL) and growth hormone (GH), although regulation of
milk production is slightly different depending on the species. GH
is dominant in ruminants, whereas PRL is dominant in rodents and
humans [120,121]. In humans, lactogenesis starts in mid- pregnancy with the differentiation of the mammary gland to
secrete small quantities of specific milk components through a
combination of high concentrations of estrogen and progesterone.
However, secretion of milk is inhibited by progesterone at this
point. The second step in lactogenesis occurs around parturition;
after a rapid decrease of progesterone concentrations, inhibition
of PRL release ends and milk production and secretion start. The
suckling action of the infant at the breast (or pumping) causes
FIGURE 3. Feasible effects of cannabinoids on the hypothalamus–pituitary axis related to lactation. Created with BioRender.com.
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release of oxytocin in the hypothalamus that stimulates milk
ejection in the mammary gland and the release of PRL by the
anterior pituitary gland (Figure 3). Conversely, secretion of
dopamine and/or the lack of suckling stimuli (or pumping) inhibit
PRL release, and consequently, milk production [120,122].
Cannabinoids such as THC and CBD are known to interact
with the dopaminergic system [123,124], leading to possible
effects on milk synthesis. However, studies to determine how
cannabinoids interact with the dopaminergic system [125–128]
have yielded inconclusive results (described below), and more
research is warranted.
Effects of cannabinoids on PRL
The inhibitory effect of endocannabinoids AEA and 2-arachi- donoylglycerol on PRL has been demonstrated in mice [74,129,
130], and a similar effect was observed after THC administration
[131,132]. Rodríguez de Fonseca et al. [125] observed a brief
rise in plasma PRL before a prolonged decrease after THC
administration in rats. Pagotto et al. [126] proposed a biphasic
action of cannabinoids on PRL secretion; first an increase of PRL
secretion by activation of CB1R in the pituitary, followed by an
inhibitory effect through the activation of dopamine release.
However, studies in monkeys have shown both a reduction of
circulating PRL concentrations [127] and no clear trends [128]
after THC administration.
The specific effect of THC on PRL was addressed in 2 studies
on rats carried out in the 1980s. In the first study, THC was
injected to ovariectomized rats, and serum PRL concentrations
were assessed before and after treatment. The research reported
that THC suppressed serum PRL concentrations 10 min after the
treatment, an effect that lasted for 1 h [133].
In the second study, THC or vehicle was injected into lactating
rats before initiating suckling or once suckling was established
[134]. After treatment with vehicle, serum PRL concentrations
increased from 14 to 215 ng/mL during suckling and decreased
to 74 ng/mL 1 h after suckling ceased. Conversely, in the THC
group, PRL concentration did not change during suckling,
reaching the highest concentration at 53 ng/mL. When testing
the THC effect once suckling was established, they observed that
serum PRL concentration declined following treatment, and
concentrations remained lower even though the suckling
continued. Whether the THC effects on serum PRL concentra- tions observed in lactating rats also occur in lactating women has
not been explored.
The effect of THC on human serum PRL concentrations in
nonlactating women using cannabis has been studied, but results
are conflicting. Some studies have concluded that THC does not
affect serum PRL concentration after acute exposition
[135–137]. However, D’Souza et al. [136] observed that plasma
PRL in a group of people who frequently used cannabis (>10
exposures over last month) was lower than in people who did not
use. On the contrary, Lee et al. [138] quantified PRL in the serum
of 6 people who chronically and heavily used cannabis (used for
5 y, and between 25 and 30 d of use within the last months)
and reported that half had elevated PRL concentrations beyond
the reference range.
The association of cannabis use and milk production was
considered in one study carried out by Josan et al. [63].
Lactating women over 6–8 wk postpartum who used cannabis
(n 1⁄4 22) and others who did not use cannabis (n 1⁄4 18)
completed a survey about breastfeeding practices and usage
patterns of cannabis. The 66.7% of the women who used
cannabis during pregnancy used it daily, mostly via smoking
(94%). Postpartum use was reported by 55%, following similar
patterns; 66.7% used cannabis daily, and most (83%) smoked
[63]. In this study, the group of women who used cannabis
self-reported lower concentrations of milk production (average
amount of milk pumped at one time) during the first 6 wk
postpartum. It is important to note that, 41% and 36.4% of the
participants who used cannabis reported cigarette use during
and after pregnancy, respectively, and reduced production of
milk among tobacco-smoking women has been reported [139].
Therefore, it is still unknown whether cannabis use itself does
indeed influence milk production.
The possible reduction in milk production caused by canna- binoids’ effects on PRL concentrations could be a factor affecting
the establishment of breastfeeding. Indeed, concerns about milk
supply is one of the main reasons why women stop breastfeeding
completely before 6 mo [140,141]. Although a shorter duration
of breastfeeding was observed in women who used cannabis than
in those who did not use [142], the association of this shorter
breastfeeding duration with lower milk production was not
addressed in the study.
To evaluate the possible effect of cannabinoids on milk pro- duction, accurate methods to measure milk production must be
used to achieve reliable results. Factors influencing variability in
milk production, such as time postpartum, time of the day, time
since last breastfeeding session, and maternal factors (e.g.,
adiposity and medications) must be controlled for or at least
detailed. Likewise, an accurate analytical method for measuring
milk production, such as deuterium dilution or test-weighing,
needs to be used to fully understand the physiology and out- comes that might be associated with cannabis use during
breastfeeding [143]. Thus, studies designed to determine the
specific effect of cannabis (and not other products such as to- bacco) on milk production should be pursued.
Effects of cannabinoids on dopamine and oxytocin
Increased dopamine release caused by cannabinoids has been
observed in studies using murine models [144,145]. Moreover, it
has been suggested that this cannabis-induced release of dopa- mine is caused by the activation of CB1R in the hypothalamus
[146,147]. Higher dopamine concentrations might inhibit PRL
release from the pituitary, affecting regulation of milk synthesis
and secretion [148].
The effect of cannabinoids on oxytocin during lactation was
assessed in an animal model study. Intravenous THC or vehicle
was injected into lactating rats and the stretch response of the
pups—a signal of milk ejection—was recorded [149]. Milk
ejection is caused by an increase in the mammary pressure
provoked by the release of oxytocin. The intervals between milk
ejections before THC or vehicle injection were 7 and 6.5 min,
respectively. After injection of vehicle in the control group,
intervals between milk ejections remained similar to those
before treatment. However, after injection of THC, there was a
latency period of 59 min before the next milk ejection was
observed; even after resuming milk ejections, intervals were
lengthened (between 15 and 16 min).
In addition to regulating lactogenesis, oxytocin and dopamine
play key roles in establishment of the mother–infant bond. In
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animal models, higher oxytocin receptor concentrations have
been observed in rats that showed more attachment to the pups.
The same effect has been observed with dopamine; decreased
dopamine transporters are associated with weakened maternal
behavior [150]. A recent study demonstrated that the ECS is
involved in the oxytocin-dependent formation of pair bonds. The
administration of an endocannabinoid antagonist to female
paired prairie voles inhibited the oxytocin-bonding effect and
even increased “rejection-like” behaviors toward their partners
[151]. The possible effect of cannabis use on mother–infant
bonding has yet to be explored.
Summary
Prevalence of cannabis use among the United States popula- tion has increased over the last 20 y with a notable proportion of
pregnant and breastfeeding women reporting use. At the same
time, perceived risk of cannabis has decreased within this pop- ulation. It is widely demonstrated that phytocannabinoids can be
found in milk produced by women who use cannabis during
pregnancy and/or breastfeeding. Although empirical support in
human is lacking, results from animal studies and human studies
focused on nonpregnant, nonlactating individuals suggests the
possibility that long-term accumulation of cannabinoids in
mammary adipose tissue might interfere with the process of
lactogenesis by directly activating cannabinoid receptors.
Furthermore, phytocannabinoids may affect milk output and
composition, especially lipid and fatty acid profiles, by modu- lating the expression of genes involved in fatty acid synthesis.
Regulation of synthesis and secretion of milk might also be
affected by cannabinoids via their interactions with the endo- crine system. However, substantial research is needed utilizing
rigorous methods for milk collection and production to demon- strate any of these potential effects.
Author contributions
The authors’ responsibilities were as follows – ICN, MKM,
MAM: conceptualized and designed this review; ICN: researched,
analyzed the background literature, and drafted the manuscript;
MKM, MAM, JEW, EAH, CLM: provided critical review, com- mentary, and revisions to the manuscript; and all authors: read
and approved the final manuscript.
Q5 Conflict of interest
The authors report no conflict of interest.
Q6 Funding
Q7 The authors reported no funding received for this study.
Q8 References
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36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
14