Health agencies think that an ingredient used in all COVID-19 vaccines can result in allergic reactions. The chemical structure of the ingredient is related to polyethylene glycol (PEG), found in many everyday products like foods, cosmetics, and medications.
Doctors found that one individual experienced PEG-related anaphylaxis after his Pfizer shot, but he had a history of allergic reactions to many PEG-containing products. That’s why it is important to be aware of your allergies, if you have any, of course.
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