(4) Tamarinds contain high levelsof tartaric acid, just as citrusfruits contain citric acid.Tartaric acid, a carboxylic acid,gives tamarind its sour color.It also contains a significantlevel of vitamin C, E, and B,calcium, iron, phosphorous,potassium, manganese, anddietary fiber. There are also anumber of organic compoundsthat make tamarind a powerfulantioxidant and anti-inflammatoryagent.