mRNA is a description of a type of molecule that occurs naturally in the body, just like DNA and RNA occur. You already have some.
That said, the vaccines are said to be mRNA that has been artificially synthesized. Unless you get a lot of injections, you wouldn't even have the opportunity to have artificial mRNA in your body.
It's theoretically possible that anything small enough to go through a syringe could be in a vaccine, so... it's possible they've been in vaccines before, but it's quite a stretch, outside of experimental stuff.
mRNA is a description of a type of molecule that occurs naturally in the body, just like DNA and RNA occur. You already have some.
That said, the vaccines are said to be mRNA that has been artificially synthesized. Unless you get a lot of injections, you wouldn't even have the opportunity to have artificial mRNA in your body.
It's theoretically possible that anything small enough to go through a syringe could be in a vaccine, so... it's possible they've been in vaccines before, but it's quite a stretch, outside of experimental stuff.
Thank you for your very detailed clear response! I appreciate your time and expertise!