Melatonin May Protect Against Cannabis-Related Hormonal Disruption in Female Rats
Melatonin supplementation reversed cannabis-induced disruption of reproductive hormones in female rats, with effects mediated primarily through CB1 receptors.
Quick Facts
What This Study Found
Cannabis extract significantly altered levels of GnRH, FSH, LH, estradiol, progesterone, and prolactin in female rats. Blocking CB1 receptors caused more hormonal disruption than blocking CB2, suggesting CB1 primarily disrupts the hypothalamic-pituitary-gonadal axis. Melatonin ameliorated these effects even when cannabinoid receptors were blocked.
Key Numbers
50 female rats in 10 groups of 5. Treatment lasted 14 days. Cannabis extract dose: 2 mg/kg. Melatonin dose: 4 mg/kg. CB1 blockade caused more hormonal toxicity than CB2 blockade.
How They Did This
Fifty female Wistar rats were divided into 10 groups receiving various combinations of cannabis extract, CB1 blocker (rimonabant), CB2 blocker (AM630), and melatonin over 14 days. Reproductive hormones were measured using ELISA assays.
Why This Research Matters
This study provides mechanistic evidence for how cannabis might disrupt female reproductive hormones and identifies a potential protective strategy. The finding that CB1 receptors play a larger role than CB2 in hormonal disruption adds specificity to our understanding.
The Bigger Picture
With rising cannabis use among women of reproductive age, understanding how cannabis affects reproductive hormones is increasingly relevant. The melatonin finding, while preliminary, opens a line of inquiry into protective supplementation.
What This Study Doesn't Tell Us
Animal study with only 5 rats per group, limiting statistical power. Short 14-day treatment period. Rat reproductive physiology differs from humans. The cannabis extract dose may not reflect typical human consumption patterns.
Questions This Raises
- ?Would melatonin supplementation have similar protective effects in humans?
- ?Are the hormonal changes observed at this dose relevant to typical human cannabis consumption levels?
Trust & Context
- Key Stat:
- CB1 causes more hormonal disruption than CB2
- Evidence Grade:
- Small animal study with 5 rats per group over a short treatment period. Findings are mechanistically interesting but far from clinical application.
- Study Age:
- 2026 animal study.
- Original Title:
- Melatonin mitigates hormonal toxicity in cannabis-treated female Wistar rats: involvement of cannabinoid receptor.
- Published In:
- Journal of cannabis research, 8(1), 27 (2026)
- Authors:
- Oluwasola, A
- Database ID:
- RTHC-08531
Evidence Hierarchy
Tests effects in animals (usually mice or rats), not humans.
What do these levels mean? →Frequently Asked Questions
Does cannabis affect female reproductive hormones?
In this rat study, cannabis extract significantly altered six key reproductive hormones. Human evidence is still limited but growing.
Could melatonin actually protect against these effects in people?
This is an early animal finding. Whether melatonin has similar protective effects on human reproductive hormones during cannabis use has not been tested.
Read More on RethinkTHC
Cite This Study
https://rethinkthc.com/research/RTHC-08531APA
Oluwasola, A. (2026). Melatonin mitigates hormonal toxicity in cannabis-treated female Wistar rats: involvement of cannabinoid receptor.. Journal of cannabis research, 8(1), 27. https://doi.org/10.1186/s42238-025-00375-8
MLA
Oluwasola, A. "Melatonin mitigates hormonal toxicity in cannabis-treated female Wistar rats: involvement of cannabinoid receptor.." Journal of cannabis research, 2026. https://doi.org/10.1186/s42238-025-00375-8
RethinkTHC
RethinkTHC Research Database. "Melatonin mitigates hormonal toxicity in cannabis-treated fe..." RTHC-08531. Retrieved from https://rethinkthc.com/research/oluwasola-2026-melatonin-mitigates-hormonal-toxicity
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.