Vitamin D3: ELISA Kits

25-hydroxy-vitamin D₃ (25(OH)D₃) is synthesized in the liver and is the primary circulating form of vitamin D. Its blood concentration, which reflects 25(OH)D₃ produced by exposure to ultraviolet B, as well as dietary and vitamin D supplementation, is felt to be the best indicator of vitamin D status. 25(OH)D₃ is metabolized to 1-alpha,25(OH)₂D₃ in the proximal tubular cells of the kidney by the enzyme 1-alpha-hydroxylase. The vitamin D structure is similar to that of classic steroid hormones, ...