I believe shedding has now been proven in a peer-reviewed study:
BREAKING STUDY: Pfizer mRNA Found in Over 88% of Human Placentas, Sperm, and Blood — and in 50% of Unvaccinated Pregnant Women
https://www.thefocalpoints.com/p/breaking-study-pfizer-mrna-found
https://www.thefocalpoints.com/p/pfizer-mrna-invades-fetal-tissue