Theobromine, also known as xantheose, is the principal alkaloid of Theobroma cacao. Theobromine is slightly water-soluble (330 mg/L) with a bitter taste. In industry, theobromine is used as an additive and precursor to some cosmetics. It is found in chocolate and several other foods, including tea, some American hollies and the kola nut. It is a white or colourless solid, but commercial samples can appear yellowish.