// Hacker Noon · 12 March 2026

COVID-19 Vaccines Linked to Minor, Temporary Changes in Menstrual Cycle Length

A large analysis from the Apple Women’s Health Study examined 128,000 menstrual cycles from nearly 10,000 participants. Researchers found that receiving vaccines like Pfizer‑BioNTech COVID‑19 Vaccine, Moderna COVID‑19 Vaccine, or Johnson & Johnson COVID‑19 Vaccine was linked to a very small increase...

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