I got the first Moderna shot against my better judgment—and I was never warned by anyone of any possible correlation between the "vaccine" and iron and/or ferritin. I'm sure that there are many other interactions, etc., that haven't been brought to light as well—and that is what's wrong with using something that hasn't been tested over time. I got my Moderna shot in March 2021 and I am still having issues with iron and ferritin....both are now in the normal range, but low in the range. They don't know if that will ever change. I've also bumped up my protein consumption and take two 750-mg grass-fed desiccated beef liver capsules every day.