Messenger RNA in vaccines is taken up by cells, translated into protein over days, and then breaks down, ceasing protein production.

“first of all when the messenger RNA is taken up by cells and everybody it's primarily something called dendritic cells which is the major kind of antigen presenting cell in your body that present cells presents antigens to the immune system through the rest of the immune system so it's taken up it's in a lipid nanoparticle the lipid nanoparticles taken up in the cell it's stripped away and then that messenger RNA enters the ribosomal system where like the other couple hundred thousand copies of messenger RNA that are in your cytoplasm it's then translated to a protein and that happens over over days and then the messenger RNA like all message rnas breaks down and and is no longer making that protein”