These proteins help the viruses grow before they go into the vaccine. It comes from an organic form of mercury called ethylmercury, a safe compound that - unlike other forms of mercury - does not remain in the body.Įthylmercury is different from the standard form of mercury that can cause illness in large doses, and it is also different from the mercury found in seafood, called methylmercury, which can stay in the body for years. Thimerosal has been safely included in vaccines since the 1930s. Single-dose vials, prefilled syringes, and nasal sprays do not need a preservative, because the risk of contamination is so low. Without it, the growth of bacteria and fungi are common in these vials. This ingredient is only present in multi-dose vials, which contain more than one dose. Thimerosal is a preservative, and it keeps vaccines from becoming contaminated. They are not always present in flu vaccines, some of which are aluminum-free. This allows scientists to include smaller amounts of the inactivated influenza viruses in these vaccines.Īs with formaldehyde and most ingredients in flu shots, the amount of aluminum present is extremely small.Īluminum salts are also in drinking water and various health products, such as antacids and antiperspirants. Aluminum saltsĪluminum salts are adjuvants - they help the body develop a stronger immune response against the virus in the vaccine. However, the tiny amounts present in flu vaccines are harmless.įormaldehyde’s role in a flu shot is to inactivate toxins from viruses and bacteria that may contaminate the vaccine during production. In high doses, formaldehyde is toxic and potentially lethal. In 2020–2021, this is one known as the Phuket strain.įormaldehyde, a chemical typically present in the human body, is a product of healthy digestive function.
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