Alum, (IPA: /ˈæləm/) refers to a specific chemical compound and a class of chemical compounds. The specific compound is the hydrated aluminum potassium sulfate with the formula KAl(SO4)2.12H2O. The wider class of compounds known as alums have the related stoichiometry, AB(SO4)2.12H2O.
Alum is used in vaccines as an adjuvant to enhance the body's response to immunogens.
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