Sourced of - https://philipmcmillan.substack.com/p/why-do-menstrual-irregularities-occur This is a crucial question for women and especially children in the context of potential longer term issues. About 66% of menstruating women are affected! Needs further clarification. Link to the paper below: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8976114/ Muhaidat, Nadia, et al. "Menstrual symptoms after COVID-19 vaccine: a cross-sectional investigation in the MENA region." International Journal of Women's Health 14 (2022): 395.