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The safety of vaccine ingredients, including the use of polyethylene glycol (PEG) and other excipients, has been evaluated in clinical trials.
The principal components of the most widely used are the active immunogen ( or a viral vector), a set of lipid or stabilizing excipients that protect and deliver that active ingredient, salts and buff...
Vaccines contain antigens plus small amounts of adjuvants, preservatives, stabilizers and residuals that regulators and large bodies of evidence say are safe at the tiny doses used in licensed product...
(thiomersal) remains used primarily as a preservative in multi‑dose vials of influenza (flu) vaccines worldwide, while routine childhood vaccines in high‑income countries have been reformulated to be ...