Very. Social media has been inundated with reports of shedding since April/May 2021, including stories of bleeding and upset menstrual cycles from women who have been in contact with others who have been vaccinated; too many to be ignored.

The advice is to steer clear of people in the weeks following their vaccination. But it is not known how long shedding continues.
The nay-sayers say that you need a live virus for shedding to occur and there is no live virus in the vaccine (REALLY?!?) You will find pages and pages of respectable website, like webmed and health.com, insisting that shedding is not possible.
Nevertheless the reports keep coming. see RightsFreedom for details of a Pfizer document that confirms ‘Covid Vaccine Shedding’ leading to ‘Menstrual Cycle Disruption’ and ‘Miscarriage’ is possible via ‘skin-to-skin contact’ and ‘breathing the same air’
REMEDIES
If you are not vaccinated and feel that you have shed upon, then there are remedies. Many swear by Pine Needle tea . Others use one of the Covid Cures as a prophelactic – for prevention.