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1 Squalene is a component of some adjuvants that are added to vaccines to enhance the immune response. 2  MF59, an adjuvant produced by Novartis and added to the FLUAD flu vaccine, is such an example. 3  Squalene by itself is not an adjuvant, but emulsions of squalene with surfactants do enhance the immune response.hat is squalene? 1  Squalene is a naturally occurring substance found in plants, animals, and humans. 2  Squalene is also found in a variety of foods, cosmetics, over-the-counter medications, and health supplements. 3  Squalene is commercially extracted from fish oil, and in particular shark liver oil.
Neither study suggests how the vaccine may have become contaminated with squalene. Squalene is found in humans, animals and plants, and squalene from shark oil and other sources has been used for many years as an ingredient in cosmetics and other personal care preparations.qualene has been used as an adjuvant in several experimental human vaccines, including HIV vaccines, in efforts to boost the immune response, but the DoD has stated in the past that squalene was never intentionally added to the anthrax vaccine.