The package insert that comes with the vaccine will set forth all the warnings and known side effects. So far they appear to be mild (sore arm, some headache) and 6 reported anaphylactic shock out of more than a million doses. Assuming that’s all accurately reported, it should be very safe. And yes, the Pfizer and Moderna vaccines are “messenger DNA”, meaning they don’t have live or inactivated virus but rather a synthetic that has been modified to deliver the message to our immune system for help, and it is actually our own system that knocks out the coronavirus. It should be safe but best to get it where a professional is standing by in case of shock (which can be managed by epinephrine and adrenaline if necessary). For me, I’m taking it as I see it as a better risk than getting COVID.