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Vitamin D
Vitamin D is a fat-soluble vitamin that is naturally present in very few foods, added to others, and available as a dietary supplement. It is also produced endogenously when ultraviolet rays from sunlight strike the skin and trigger vitamin D synthesis. Vitamin D obtained from sun exposure, food, and supplements is biologically inert and must undergo two hydroxylations in the body for activation. The first occurs in the liver and converts vitamin D to 25-hydroxyvitamin D [25(OH)D], also known as calcidiol. The second occurs primarily in the kidney and forms the physiologically active 1,25-dihydroxyvitamin D [1,25(OH)2D], also known as calcitriol.
Vitamin D is essential for promoting calcium absorption in the gut and maintaining adequate serum calcium and phosphate concentrations to enable normal mineralization of bone and prevent hypocalcemic tetany. It is also needed for bone growth and bone remodeling by osteoblasts and osteoclasts. Without sufficient vitamin D, bones can become thin, brittle, or misshapen. Vitamin D sufficiency prevents rickets in children and osteomalacia in adults. Together with calcium, vitamin D also helps protect older adults from osteoporosis.
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Vitamin D
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35% off Reg: $ 6.79
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Calcium Citrate Magnesium Plus Vitamin D3 Caplets
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20% off Reg: $ 12.95
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Calcium Citrate Plus Vitamin D3 Caplets
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20% off Reg: $ 9.95
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Calcium Magnesium Zinc Plus Vitamin D3 Softgels
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20% off Reg: $ 9.95
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Liquid Calcium Magnesium Citrate Plus Vitamin D3
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20% off Reg: $ 12.50
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Milk-Free Calcium 1200 mg Plus Vitamin D3 Softgels
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20% off Reg: $ 9.95
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Vitamin D3 1000 IU Softgels
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20% off Reg: $ 6.95
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Vitamin D3 1000 IU Vcaps
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20% off Reg: $ 8.95
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Vitamin D3 2000 IU Softgels
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20% off Reg: $ 10.95
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Vitamin D3 2000 IU Vcaps
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20% off Reg: $ 15.95
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Vitamin D3 400 IU Softgels
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20% off Reg: $ 5.95
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Vitamin D3 400 IU Vcaps
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20% off Reg: $ 7.95
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