Covid 19 Vaccines and Mensturation

As the COVID-19 vaccines first rolled out in the United States, an unanticipated, anecdotal side effect started to emerge: Many people speculated that the vaccine seemed to have an effect on their menstrual cycle.

Studies that examined whether those anecdotes could be explained by science were sparse and small—which is not surprising, given the slow pace of research on menstruation within vaccine trials. Then, in July, the largest study of its kind published in the journal Science Advances added some support to the claims people were sharing online. Here’s what we know so far about how the COVID vaccines may affect a person’s period and why more research is still needed.

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