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Cannabis Boosts Young Men's Testosterone 23%, Fertility Unclear

5/28/2026

Summary

Story summary

A University of Geneva study found cannabis use raised testosterone by about 23% in young men.
Researchers measured blood plasma from 94 Swiss conscripts aged 18-23, split evenly between users and non-users.
Hormone analysis traced the rise to Leydig cells in the testes, while adrenal androgen levels stayed unchanged.
The authors warned that higher testosterone does not mean better sperm quality and urged more research on long-term fertility effects.

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Story summary

A University of Geneva study found cannabis use raised testosterone by about 23% in young men.
Researchers measured blood plasma from 94 Swiss conscripts aged 18-23, split evenly between users and non-users.
Hormone analysis traced the rise to Leydig cells in the testes, while adrenal androgen levels stayed unchanged.
The authors warned that higher testosterone does not mean better sperm quality and urged more research on long-term fertility effects.