Does Your Menstrual Cycle Affect Vaccinations?

Does it matter where you are in your menstrual cycle when you get vaccinated? Someone finally decided to find out.

A new study in npj Women’s Health looked at 1,474 women who used the Clue app and got a COVID vaccine. If you were vaccinated during the follicular phase (first half of your cycle, estrogen rising), then there was a 35% higher odds of reporting any side effect, not worse, just more likely to happen in general. Vaccinated during the luteal phase? Fewer reported side effects, but a