Anyone interested should follow Sen Ron Johnson's current Senate investigation into the "safe and effectives". Just hitting the wingnut sites now.
Snippet of their coverage, based on released documents:
In February 2021, Israeli health officials warned the CDC of “large reports of myocarditis, particularly in young people” following Pfizer injections, just two and a half months after the vaccine received emergency use authorization.
By April, the CDC was already reviewing myocarditis data from Israel and the Department of Defense. But instead of alerting the public, they stayed quiet.