I'm not sure if they "know for a fact", but the fact that
Posted on: January 25, 2022 at 20:44:33 CT
CulturedDan
MU
Posts:
93705
Member For:
15.08 yrs
Level:
User
M.O.B. Votes:
0
the manufacturer of Regen-cov itself said they were losing effectiveness is enough for me.