Researchers at Oregon Health & Science University reveal COVID-19 vaccines affect a woman’s menstrual cycle. The study tracked the menstrual cycles of 3,959 participants throughout six cycles. Those who received their first dose of the vaccine waited 0.71 days longer on average for their next menstrual cycle. Researchers said the delay of vaccinated women’s menses appeared to be temporary and noted that after two cycles later, the vaccinated group reverted to the length of their pre-vaccination cycle.
