Australian Icon Vegemite is one of the richest sources of B vitamins, specifically thiamine, riboflavin, niacin and folate (B1, B2, B3 and B9, respectively). Unlike Marmite and some other yeast extracts, the base version contains no vitamin B12 although both B6 and vitamin B12 are added to the low-salt formulation. The main ingredient of Vegemite is yeast extract, which contains a high concentration of glutamic acid, the source of Vegemite's rich umami flavour. Vegemite does not contain any fat, added sugar or animal content. It contains gluten (a composite of storage proteins).