A peer-reviewed study published by the journal Obstetrics & Gynecology on January 5, 2022, found that women receiving one dose of a COVID-19 vaccine during a single menstrual cycle had an increase in cycle length of nearly one day.
And a study subgroup that received two COVID-19 vaccine doses in the same menstrual cycle (358 users) had a more significant average increase in cycle length of two days.
However, this change appears to decrease in subsequent cycles, indicating that the menstrual changes likely are temporary.
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