1-hydroxy Vitamin D3

Vitamin D aids in the absorption of calcium and has central roles in bone formation and maintenance, hypertension, cancer, and immunity.{15096,19429} 1-hydroxy Vitamin D3 is a synthetic prodrug which is converted by cytochrome P450 isoforms to the vitamin D receptor agonist 1,25-dihydroxy vitamin D3 in vivo.{21568,21563} Such prodrugs are effective in suppressing the synthesis and secretion of parathyroid hormone in secondary hyperparathyroidism, an action which requires the vitamin D receptor.{21564,21563,21567} 1-hydroxy Vitamin D3 supports bone growth both in postmenopausal women and in glucocorticoid-induced osteoporosis.{21585,21586} It also provides renal and cardiovascular protection during chronic kidney disease.{21565,21584}