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The aim of this prospective cohort study was to investigate the effect of coronavirus disease 2019 (COVID-19) vaccinations on menstrual cycle and ovarian reserve in reproductive aged-women. Health care providers ( n  = 258) vaccinated with inactivated (CoronaVac) and mRNA based (Pfizer-BioNTech®) COVID-19 vaccines were included. All subjects completed a gynaecological and menstrual history questionnaire and Anti-Mullerian Hormone (AMH) levels were measured in serum samples collected before first vaccination and at 1 st , 3 rd , 6 th  and 9 th  months. The prevalence of new-onset menstrual dysregulation following vaccination was 20.6% and it was statistically significant compared to baseline ( p  = 0.001). Menstrual pattern turned back to normal in 59.6% of vaccinated women. Serum AMH levels gradually decreased until 6 th  month of follow-up compared to baseline ( p  &lt; 0.001). A significant increase in serum AMH level was observed at 9 th  month of follow-up compared to 6 th  month follow-up levels ( p  &lt; 0.001). The decrease in serum AMH level was statistically significant regardless of serum anti SARS-CoV-2 antibody levels, subgroups of age, occupation, menstrual dysregulation following vaccination and presence of gynaecological diseases. In conclusion, vaccination against SARS-CoV-2 causes a transient decrease on serum AMH levels and moderate irregularities in menstrual pattern increasing with age and is mostly reversible.

The effect of COVID-19 vaccinations on menstrual cycle and serum anti-Mullerian hormone levels in reproductive age women