Abstract
The biochemistry of chromium(III) has been a poorly understood field of endeavor. Despite four decades of investigation, only recently has a somewhat clear picture of the role of Cr been refined. Chromium(III) is required for proper carbohydrate and lipid metabolism in mammals, although chromium deficiency is difficult to achieve. Conditions that increase circulating glucose and insulin concentrations increase urinary chromium output. Chromium is excreted after an insulin challenge in the form of the oligopeptide chromodulin. Chromodulin may be the key to understanding the role of chromium at a molecular level as the molecule has been found to bind to activated insulin receptor, stimulating its kinase activity. An examination of the history of studies of chromium picolinate and glucose tolerance factor illustrates the difficulties and problems associated with biochemical studies dealing with chromium(III).
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