Taurine widely exists in the intracellular fluid of various tissues of animals in free form, and it is rarely contained in plants. The content of taurine is high in the main organs of mammals, such as heart, brain and liver; The most abundant content is marine fish, shellfish, marine plants, seaweed, shrimp, conch, clams, etc. the fish taurine in sardine and sardines is also very rich.