THC in the Reproductive Environment
A new study reveals that cannabis use, particularly exposure to its active compound THC, directly interferes with female fertility and reduces the success of in vitro fertilization (IVF). Researchers detected THC and its metabolites in the follicular fluid—the liquid that surrounds and nourishes eggs in the ovaries—of women undergoing IVF treatment. This discovery proves that cannabis compounds can reach and act on developing eggs.
Impact on Egg and Embryo Quality
THC exposure not only accelerated egg maturation but also increased risks. Eggs that matured in the presence of THC showed more frequent chromosomal segregation errors and spindle abnormalities, structures that play a vital role in correct cell division. Consequently, embryos formed from these eggs carried higher chances of chromosomal abnormalities and were less often euploid, meaning they had the correct number of chromosomes. Because euploid embryos are more likely to implant successfully and develop normally, their decline directly reduces IVF success rates.
Broader Implications for Fertility
Women undergoing IVF who had THC in their follicular fluid produced fewer chromosomally normal embryos. This evidence suggests that cannabis use, even when occasional, can make conception through assisted reproduction more difficult and extend the time it takes to achieve pregnancy. Researchers also found that THC exposure altered gene activity linked to chromosome organization, inflammation, and cell structure, which all play key roles in embryo development.
A Call for Caution
Although scientists still need more data on how dose, frequency, and method of cannabis use affect fertility, the current results raise clear concerns. Women considering or undergoing IVF can improve their chances of success by avoiding cannabis and protecting the quality of their embryos.
