What additives are in vaccines?
A. Chemicals are used in food and medicines to prevent the growth of harmful germs and reduce spoilage; in vaccines, chemical compounds are used to inactivate (kill) a virus or bacteria or stabilize it, helping to preserve the vaccine and keep it effective and sterile. Chemical components used as preservatives in vaccines occur in very small quantities, far too small to provoke a serious allergic response in most people. Almost all childhood vaccines are Thimerosal free.