B vitamins are indispensable trace elements to maintain health and help prevent diseases. They also play a great role in losing weight, participating in the metabolism of fat and sugar in the body, helping to promote the metabolism of the body and helping to burn fat. B vitamins are a kind of water-soluble small molecular compounds, which have no similar structure and generally participate in various physiological processes in the form of coenzyme. The known B vitamins mainly include: vitamin B 1 (ammonium sulfate), vitamin B2 (riboflavin), vitamin B3 (nicotinic acid), calcium pantothenate (pantothenic acid), vitamin B6 (pyridoxine) and vitamin B7 (biotin). B vitamins are indispensable substances in the metabolism of sugar, fat and protein. B vitamins affect the metabolism of substances by forming coenzyme in organisms. B vitamins are composed of compounds with similar biological activities but different chemical components, and can exist in free form.