I believe shedding was confirmed in some fashion. Which makes sense; if you can have intranasal vaccination, vaccinations can spread through air. If the function of the virus is to produce spike proteins, and the vaccine causes you to produce spike proteins, shedding makes sense.

Vitamin sources of calcium, I think it was, also increases the chance of kidney stones. It's recommended to get a lot of things through a balanced diet rather than through supplements. IIRC similar doses from food products didn't show any increases in kidney stone formation, while supplements did.

I believe I've heard more negatives than just blood clotting for K as well, but cannot recall for sure.