Cannabis
Cannabinoids
🟡 Several human studies point the same way, with a plausible biological mechanism, but the evidence is not yet conclusive.
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In brief
Cannabis and fertility: this page reviews Cannabis (Cannabinoids) — documented mechanism, everyday exposure situations and possible alternatives. Level of evidence: Probable.
- Where it's found
- Occasional or regular recreational use, smoked or inhaled.
- Suspected mechanism
- The endocannabinoid system is involved in sperm maturation and ovulation; regular use is associated with lower sperm concentration.
- Suggested alternative
- Reduce frequency during the period of trying to conceive; the effect is partly reversible.
- Source
- EARTH studies; reviews on cannabis and reproductive function.
Frequently asked questions
Cannabis: how is it linked to infertility?
The endocannabinoid system is involved in sperm maturation and ovulation; regular use is associated with lower sperm concentration.
Where is Cannabis found in everyday life?
Occasional or regular recreational use, smoked or inhaled.
How can exposure to Cannabis be reduced?
Reduce frequency during the period of trying to conceive; the effect is partly reversible.
What is the level of evidence for Cannabis?
Probable. Several human studies point the same way, with a plausible biological mechanism, but the evidence is not yet conclusive.
Map your everyday exposures in about ten minutes.
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Related factors
Including a factor does not mean it causes infertility: it is simply worth monitoring, depending on its level of evidence.
Content last updated: September 14, 2026