Study links menstrual cycle timing to COVID vaccine side effects
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By Hugo Francisco de Souza Reviewed by Susha Cheriyedath, M.Sc. Jun 8 2026 New app-based research suggests that the menstrual cycle phase may influence COVID-19 vaccine reactogenicity, raising fresh questions about how hormonal fluctuations shape immune responses. Study: Menstrual cycle phase and its association with COVID-19 vaccine outcomes among period tracking app users . Image Credit: SeventyFour / Shutterstock In a recent study published in npj Women’s Health , researchers investigated
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