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[4] The second activation step takes place predominantly in the kidneys where 1-hydroxylase converts 25-hydroxyvitamin D to 1,25-dihydroxyvitamin D (calcitriol), an active secosteroid hormone that binds nuclear receptors in enterocytes, osteoblasts, renal tubules, parathyroid cells, and numerous immune and endocrine cells to modulate hundreds of genes involved in calcium-phosphate homeostasis, skeletal remodelling, and immunoregulation

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This is not another list of benefits

If you recall what Ive previously said about HGH, one of its main benefits is fat loss but it does come with its fair share of nasty side effects (insulin resistance, compromised natural HGH production, negatively pituitary gland function, etc.)