Fibroblast Growth Factor 23 (FGF23) is a member of the fibroblast growth factor family, primarily involved in the regulation of phosphate metabolism. It is a hormone produced by osteocytes and osteoblasts in the bone. FGF23 functions to reduce serum phosphate levels by inhibiting renal tubular phosphate reabsorption and decreasing the synthesis of 1,25-dihydroxyvitamin D.
