By PPN News Staff
A large international study confirmed a link between COVID-19 vaccination and longer menstrual periods, but the increase for most females was less than one day.
Using the findings from a previous U.S. study, investigators included data from nearly 20,000 people from Canada, the United Kingdom, the United States, Europe and other regions who received any of the nine different COVID-19 vaccines (BMJ Medicine 2022;1:e000297. doi: 10.1136/bmjmed-2022-000297).
The investigators