NIH Orders $1.67 Million Study on How Coronavirus Vaccines Affect Menstrual Cycles

Six months after the coronavirus vaccines were widely distributed in the United States, the National Institutes of Health (NIH) has called for a $1.67 million study on how the shots affect women’s menstrual cycles.

Since early 2021, women have reported strange side effects after receiving their first two doses of the coronavirus vaccines, though those reports have been largely anecdotal. Fearing an increase in vaccine hesitancy among women, the NIH said in an announcement last week that it will further investigate claims that the vaccines negatively affect a woman’s reproductive health: