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  Indian J Med Microbiol
 

Figure 1 Vitamin D2 and D3: Vitamin D2 and D3 are inactive biologically and require two separate hydroxylations by 25-hydroxylase (liver) and 1-α-hdroxylase (kidney) to give rise to the active form (1,25-dihydroxyvitamin D3; calcitriol). Source: Adapted from “The role of vitamin D in nervous system health and disease” (C., M., J., V., & C., 2013).

Figure 1 Vitamin D2 and D3: Vitamin D2 and D3 are inactive biologically and require two separate hydroxylations by 25-hydroxylase (liver) and 1-α-hdroxylase (kidney) to give rise to the active form (1,25-dihydroxyvitamin D3; calcitriol). Source: Adapted from “The role of vitamin D in nervous system health and disease” (C., M., J., V., & C., 2013).