Chronic cannabis extract reduced sperm count, testosterone, and fertility markers in male mice
Male mice given bhang (cannabis extract) daily for 36 days showed reduced sperm count, motility, and testosterone levels, with changes in testicular cannabinoid receptor expression.
Quick Facts
What This Study Found
Adult male mice received oral bhang (cannabis extract) at 3 or 6 mg/kg daily for 36 consecutive days. The chronic exposure produced multiple reproductive impairments.
Sperm count, viability, and motility all declined significantly. Circulating testosterone levels dropped due to reduced activity of a key steroidogenic enzyme (3-beta-HSD) in the testes.
The study also confirmed that CB1 and CB2 cannabinoid receptors and the endocannabinoid-degrading enzyme FAAH were present in mouse testes. Bhang exposure significantly altered the levels of these proteins.
Both in vivo and in vitro experiments showed bhang directly affected testicular function by reducing luteinizing hormone receptor expression, suggesting effects beyond just hormonal disruption from the brain.
Key Numbers
Bhang doses: 3 or 6 mg/kg/day for 36 days. Significant reductions in sperm count, viability, motility, and testosterone. Significant changes in CB1, CB2, and FAAH protein levels in testes.
How They Did This
Controlled animal study in adult male Parkes strain mice. Bhang administered orally at 3 or 6 mg/kg/day for 36 days. Sperm parameters, testosterone levels, enzyme activity, and protein expression measured by immunohistochemistry. In vitro testicular tissue exposure also performed.
Why This Research Matters
The study demonstrated that cannabis can directly affect testicular function through the endocannabinoid system, not just indirectly through hormonal disruption, expanding understanding of how cannabis affects male fertility.
The Bigger Picture
The presence of cannabinoid receptors in testicular tissue and their alteration by chronic cannabis exposure suggested a direct pathway through which cannabis could affect male reproductive health.
What This Study Doesn't Tell Us
Mouse model with oral bhang administration that may differ from human cannabis consumption patterns. Doses and duration may not be directly comparable to human use. Fertility outcomes (actual mating success) were not tested.
Questions This Raises
- ?Are these reproductive effects reversible after cannabis cessation?
- ?Do similar changes in testicular cannabinoid receptors occur in human cannabis users?
Trust & Context
- Key Stat:
- Sperm count, motility, and testosterone all declined after 36 days of cannabis
- Evidence Grade:
- Controlled animal study with dose-response design and mechanistic investigation, but limited to mouse models.
- Study Age:
- Published in 2011. Research on cannabis and male reproductive health has continued.
- Original Title:
- Effects of chronic bhang (cannabis) administration on the reproductive system of male mice.
- Published In:
- Birth defects research. Part B, Developmental and reproductive toxicology, 92(3), 195-205 (2011)
- Database ID:
- RTHC-00470
Evidence Hierarchy
Tests effects in animals (usually mice or rats), not humans.
What do these levels mean? →Frequently Asked Questions
Can cannabis affect male fertility?
In this mouse study, chronic cannabis extract reduced sperm count, sperm motility, and testosterone. The testes have cannabinoid receptors that were directly affected by cannabis exposure.
Does cannabis lower testosterone?
In mice, 36 days of daily cannabis extract reduced circulating testosterone by decreasing the activity of a key enzyme needed for testosterone production. Human studies have shown mixed results.
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Cite This Study
https://rethinkthc.com/research/RTHC-00470APA
Banerjee, Arnab; Singh, Ajit; Srivastava, Puneet; Turner, Helen; Krishna, Amitabh. (2011). Effects of chronic bhang (cannabis) administration on the reproductive system of male mice.. Birth defects research. Part B, Developmental and reproductive toxicology, 92(3), 195-205. https://doi.org/10.1002/bdrb.20295
MLA
Banerjee, Arnab, et al. "Effects of chronic bhang (cannabis) administration on the reproductive system of male mice.." Birth defects research. Part B, 2011. https://doi.org/10.1002/bdrb.20295
RethinkTHC
RethinkTHC Research Database. "Effects of chronic bhang (cannabis) administration on the re..." RTHC-00470. Retrieved from https://rethinkthc.com/research/banerjee-2011-effects-of-chronic-bhang
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.