Cannabis May Harm Male Fertility Through Multiple Pathways
A comprehensive review finds THC disrupts testosterone, sperm motility, and sperm shape through cannabinoid receptors in the testes, while CBD's long-term fertility effects remain uncertain.
Quick Facts
What This Study Found
THC disrupts the hypothalamic-pituitary-gonadal axis, reducing luteinizing hormone and testosterone levels. Cannabinoids interact with CB1 and CB2 receptors in testes, epididymis, and sperm cells, modulating testosterone synthesis, sperm motility, morphology, and capacitation. THC impairs mitochondrial activity and causes abnormal sperm shape. CBD's reproductive impact is less studied but uncertain long-term.
Key Numbers
THC affects: luteinizing hormone levels (reduced), testosterone levels (reduced), sperm motility (impaired), sperm morphology (abnormal), mitochondrial activity (impaired), capacitation (altered). Receptors involved: CB1 and CB2 in testes, epididymis, and sperm.
How They Did This
Narrative review synthesizing experimental and clinical studies on cannabis and male reproductive function. Covers spermatogenesis, sperm function, hormonal regulation, and the endocannabinoid system's role in reproductive homeostasis.
Why This Research Matters
With cannabis use rising among men of reproductive age, understanding fertility impacts is increasingly important. The evidence shows THC affects multiple steps of sperm production and function, potentially contributing to declining sperm counts observed worldwide.
The Bigger Picture
Male fertility has been declining globally for decades, and cannabis use has increased over the same period. While cannabis isn't the sole cause, this review suggests it may be a modifiable risk factor for couples trying to conceive.
What This Study Doesn't Tell Us
Narrative review format. Many studies are preclinical. Dose-response relationships in humans unclear. Most studies examine THC; CBD and other cannabinoids less studied. Difficult to isolate cannabis effects from tobacco co-use and lifestyle factors.
Questions This Raises
- ?Are fertility effects reversible after stopping cannabis?
- ?How long before conception should men stop using?
- ?Does CBD pose the same risks as THC for fertility?
Trust & Context
- Key Stat:
- Evidence Grade:
- Comprehensive review with consistent findings across experimental and some clinical studies, though many gaps in human dose-response data.
- Study Age:
- Published in 2026, synthesizing the latest evidence on cannabinoids and male reproductive health.
- Original Title:
- Phytocannabinoids and Male Fertility: Implications of Cannabis sativa and the Endocannabinoid System in Reproductive Regulation.
- Published In:
- Plants (Basel, Switzerland), 15(3) (2026)
- Database ID:
- RTHC-08256
Evidence Hierarchy
Summarizes existing research without a strict systematic method.
What do these levels mean? →Frequently Asked Questions
Can cannabis affect a man's ability to have children?
Evidence suggests yes — THC reduces testosterone, impairs sperm motility and shape, and disrupts the hormonal system controlling reproduction. These effects occur through cannabinoid receptors located directly in the testes and on sperm cells.
Is CBD safer than THC for male fertility?
CBD shows anti-inflammatory and antioxidant properties that could theoretically help, but its long-term impact on reproductive function hasn't been well studied. The review notes this as an important knowledge gap.
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Cite This Study
https://rethinkthc.com/research/RTHC-08256APA
Erukainure, Ochuko L; Nambooze, Jennifer; Chukwuma, Chika I. (2026). Phytocannabinoids and Male Fertility: Implications of Cannabis sativa and the Endocannabinoid System in Reproductive Regulation.. Plants (Basel, Switzerland), 15(3). https://doi.org/10.3390/plants15030473
MLA
Erukainure, Ochuko L, et al. "Phytocannabinoids and Male Fertility: Implications of Cannabis sativa and the Endocannabinoid System in Reproductive Regulation.." Plants (Basel, 2026. https://doi.org/10.3390/plants15030473
RethinkTHC
RethinkTHC Research Database. "Phytocannabinoids and Male Fertility: Implications of Cannab..." RTHC-08256. Retrieved from https://rethinkthc.com/research/erukainure-2026-phytocannabinoids-and-male-fertility
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.