Research challenges long standing beliefs about cannabis and male hormones

The relationship between cannabis use and the male hormonal system has long been a subject of scientific debate. A new study conducted by the University of Geneva (UNIGE), in collaboration with the Swiss Center for Applied Human Toxicology (SCAHT), offers fresh insight into this complex interaction, suggesting that cannabis use does not suppress testosterone levels in young men and may even be associated with an increase in its testicular synthesis.

Published in Communications Medicine, the research analyzed plasma samples from 94 Swiss conscripts, aged 18 to 23, split equally between confirmed cannabis users and non-users. By examining hundreds of hormones rather than focusing solely on testosterone, researchers were able to gain a more comprehensive view of the body’s steroid metabolism.

Understanding the Hormonal Shift

The study found that cannabis use is associated with an increase of approximately 23% in testosterone levels among young men. According to Professor Serge Rudaz of the UNIGE Faculty of Science, the research team was able to pinpoint the source of this increase specifically within the testes, particularly affecting Leydig cells, which are responsible for producing testosterone. Notably, androgens produced by the adrenal glands showed no such change.

Did You Know? The research team identified two new potential biomarkers of regular cannabis use—hydroxyprogesterone (11B-OHP4) and dihydroprogesterone (5B-DHP4)—which are metabolites derived from the hormone progesterone.

Despite these findings, researchers caution against assuming a direct link to improved fertility. The connection between testosterone levels and sperm quality remains highly complex. The observed hormonal increase is a compensatory response by the body to reduced sensitivity in certain androgen receptors, or that individuals with naturally higher testosterone levels may be more prone to risk-taking behaviors associated with cannabis use.

Expert Insight: Samantha Carter notes that while this study provides a significant step forward by broadening the scope of hormonal analysis, the clinical implications for long-term male reproductive health remain an open question. The findings underscore the necessity for further research to establish whether there is a specific toxicity threshold for cannabis exposure.

Future Implications

The discovery of new hormonal biomarkers could assist in monitoring endocrine disruptions related to regular cannabis exposure. Looking ahead, the scientific community may use these findings to expand studies into previously overlooked hormones that could influence the male reproductive system. Further investigation will be required to determine if these biological changes have measurable impacts on long-term fertility or if they indicate potential health risks at higher levels of consumption.

Why study at the University of Geneva? A cosmopolitan city in the heart of Europe

Frequently Asked Questions

Does cannabis reduce testosterone in young men?
No, this study suggests that cannabis use does not reduce testosterone levels in young men and is actually associated with an increase of about 23% in testosterone.

Does this increase in testosterone mean better fertility?
Not necessarily. The researchers emphasize that this increase in hormone levels cannot be directly interpreted as an indicator of sperm quality, as the link between testosterone and fertility remains complex.

What are the new biomarkers discovered by the researchers?
The researchers identified two new potential biomarkers for regular cannabis use: hydroxyprogesterone (11B-OHP4) and dihydroprogesterone (5B-DHP4), both of which are metabolites derived from progesterone.

How do you think these new findings might change the way researchers approach studies on the long-term effects of cannabis on the male reproductive system?