The number following the PEG refers to the molecular weight of that substance. The ingredients in the Pfizer COVID-19 and Moderna vaccines includes PEG-2000. It also helps to penetrate cells to jumpstart your immune system. PEG is used in the Pfizer and Moderna mRNA COVID-19 vaccines to protect the mRNA in the vaccine. creams, facial products, and baby wipes). preservatives and supplements), and cosmetic products (e.g. wound dressings and laxatives), household products (e.g. Polyethylene glycols (PEGs) are synthetic chemicals that are used frequently in our daily lives. This article discusses polyethylene glycol allergy. While we still do not know exactly what is causing all of these reactions, one of the potential culprits is polyethylene glycol. Approximately 90% of these reactions occurred within the first 30 minutes after injection.

There have been approximately 5 cases of a severe allergic reaction to these vaccines per 1 million doses administered. (Updated ) – Over 300 million doses of the Pfizer/BioNTech (also known as Comirnaty) and Moderna mRNA COVID-19 vaccines have been administered in the United States.