Cannabis and Fertility: How THC Affects Egg Health

Cannabis use is climbing worldwide, helped along by legalization and changing cultural views.  At the same time, cannabis products today are far more potent than they were a few decades ago, with THC levels sometimes exceeding 30%.  While research has already shown how cannabis affects sperm health, much less is known about how it impacts eggs—the female gametes essential for reproduction.

A new study¹ published in Nature Communications fills this gap by investigating how THC, cannabis’s main psychoactive compound, affects human oocytes (eggs) and the environment in which they mature.  The results show that THC exposure can interfere with chromosome organization, reduce embryo quality in IVF settings, and potentially influence fertility outcomes.

Study Findings on Cannabis and Female Fertility

The researchers looked at the problem in two ways.  First, they studied over 1,000 women going through in vitro fertilization (IVF).  They tested the fluid that surrounds the eggs (called follicular fluid) for THC and compared the outcomes between women who had THC in their system and those who didn’t.

Next, they ran lab experiments using donated eggs.  These eggs were exposed to realistic levels of THC to see how the compound affected their growth and development.

The results were clear.  Women with THC in their follicular fluid were less likely to produce healthy embryos with the correct number of chromosomes.  In the lab, THC exposure caused problems with the “spindles” that help pull chromosomes apart during cell division, leading to more errors.

These mistakes are important because they can cause infertility, miscarriage, or genetic conditions in embryos.

Key Takeaways from the Research

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The study paints a nuanced picture.  On the one hand, THC exposure was associated with slightly higher rates of egg maturation, suggesting it may speed up specific cellular processes.  On the other hand, this acceleration seems to come at a cost.  Eggs exposed to THC were more likely to show chromosomal abnormalities, and embryos from THC-positive patients were less likely to develop normally.

This highlights a paradox: while cannabis compounds can interact with the body’s natural endocannabinoid system—an important regulator of reproduction—introducing external cannabinoids like THC may disrupt the delicate balance needed for healthy egg development.

Why This Matters for Fertility and Pregnancy

For individuals trying to conceive, whether naturally or through IVF, egg quality is one of the most important factors for success.  Errors in chromosome segregation are a leading cause of failed implantation, miscarriage, and certain birth conditions.  By showing that THC exposure increases the risk of these errors, the study underscores the potential reproductive dangers of cannabis use, particularly during the window of egg maturation.

This is especially important because many patients do not disclose cannabis use to their doctors. In the study, 73% of women who tested positive for THC had not reported using cannabis on their intake forms.  With cannabis use often seen as harmless compared to other substances, this gap in communication could leave patients unaware of its fertility implications.

Broader Context: Cannabis and Reproductive Health

The new findings build on a growing body of evidence connecting cannabis use to reproductive outcomes.  Past research has shown that cannabis use during pregnancy is associated with increased risks for fetal growth restriction and developmental complications.  Studies also suggest that CBD, while non-intoxicating, is not necessarily risk-free during pregnancy.

On the male side, past studies have linked cannabis use to reduced sperm count, motility, and DNA integrity.  However, newer research paints a more complicated picture.  A recent meta-analysis in Andrology found no significant association between cannabis use and key semen parameters, suggesting that the effects on male fertility may not be as clear-cut as once believed.

Cannabis, Reproductive Health, and Pregnancy Risks

This study fits into a larger conversation about how cannabis influences sexual and reproductive health.

• Fertility planning: Research on sperm quality shows cannabis can alter DNA methylation and motility, and now similar concerns are emerging for eggs.  Couples trying to conceive may need to reconsider cannabis use during this period.
• Sexual wellness: Some evidence suggests cannabis can improve sexual satisfaction for certain users, but this benefit must be weighed against potential risks when conception is a goal.
• Pregnancy risks: Cannabis use among pregnant women remains worryingly high despite clear evidence of harm to developing fetuses.  Adding concerns about egg health strengthens the case for more education and caution.

What Patients Should Know

For women undergoing IVF or hoping to become pregnant, these findings carry practical implications.  Even low or moderate cannabis use can leave measurable traces of THC in follicular fluid, potentially affecting egg development.  Because egg supply is finite—women are born with all the eggs they will ever have—protecting their quality is essential.

Doctors may begin counseling patients more directly about cannabis use during fertility treatment, much like they already do for alcohol and tobacco.  Patients, meanwhile, can take these results as a reminder that “natural” does not always mean risk-free, especially when it comes to reproduction.

Conclusion

Cannabis is increasingly embraced worldwide, but this new research shows it may come with hidden costs for female fertility.  THC exposure can accelerate egg maturation while simultaneously increasing chromosomal errors, leading to fewer healthy embryos.  For people trying to conceive, especially through IVF, cannabis use could reduce the odds of success.

As legalization continues and social acceptance grows, it becomes more important than ever for patients and healthcare providers to talk openly about cannabis use.  With better awareness and more research, individuals can make informed choices about how cannabis fits—or doesn’t—into their journey toward parenthood.

Reference

^{1. Duval, C., Wyse, B. A., Fuchs Weizman, N., Kuznyetsova, I., Madjunkova, S., & Librach, C. L. (2025). Cannabis impacts female fertility as evidenced by an in vitro investigation and a case-control study. Nature Communications, 16, 8185. https://doi.org/10.1038/s41467-025-63011-2}