The problem with these mRNA vaccines as I see it is that they are programming your cells to make the spike protein on the surface of covid-19. Then your body amounts an immune response to the spike protein.
Just think that through. They are programming your body to basically have an autoimmune reaction. I don't think it is safe and the testing has been inadequate. Some of the people with severe reactions may have already had covid-19, so as soon as their body starts making the spike protein their immune system goes into overdrive attacking healthy tissues.
They also say that the message from the RNA wears off quickly but what if it lasts longer in some people then they think?
I definitely will not be rolling the dice with this technology.