The Pfizer & Moderna #COVID19 vaccines contain polyethylene glycol (PEG), a substance used to coat the mRNA to help it access cells in the body.
It is safe & is also found in toothpaste, laxatives & other products.
https://www.sciencemag.org/news/2020/12/suspicions-grow-nanoparticles-pfizer-s-covid-19-vaccine-trigger-rare-allergic-reactions