The covid 19 vaccines are very safe for most people! Though I have had the measles vaccine, the diphtheria vaccine, the TB vaccine and the Polio vaccine. When I was a kid and never experienced any side effects from those vaccines at all. But many people do experience minor side effects from the covid 19 vaccines such as tiredness and fatigue, mild fever and sometimes pain for a few days at the site of the injection. Which seems strange. By the way people under 18 will not be offered the covid vaccine because the risk to them from covid 19 is so small.