Chromium has the effect of enhancing insulin action, preventing atherosclerosis and promoting growth and development. 1. Enhance the role of insulin: chromium is an important component of glucose tolerance factor in the body, in glucose metabolism, chromium as a co-factor, has the effect of enhancing insulin. 2. Involved in lipid metabolism: chromium and fat metabolism are closely related, chromium can increase the level of HDL and apolipoprotein A and reduce the level of serum cholesterol, with the role of preventing atherosclerosis. 3. Chromium promotes fat and protein synthesis, which in turn promotes growth and development. Trivalent chromium mainly exists in natural food and living organisms, and is a low-toxicity substance, which has not been found to cause poisoning due to excessive dietary intake. Hexavalent chromium is highly toxic, mainly from industrial production, and occupational exposure can lead to acute poisoning, chronic poisoning and carcinogenicity.