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Michael F. Holick (/ ˈ h ɒ l ɪ k / HOLL-ik; [1] born 1946) is an American adult endocrinologist, specializing in vitamin D, such as the identification of both calcidiol, the major circulating form of vitamin D, and calcitriol, the active form of vitamin D. His work has been the basis for diagnostic tests and therapies for vitamin D-related ...
This author and Vitamin D specialist explains why the vitamin is so essential—and how mushrooms may be the key to healthy levels. No One Gets Enough of This Depression-Fighting Vitamin, but a ...
Calcifediol is strongly bound in blood by the vitamin D-binding protein. [5] Measurement of serum calcifediol is the usual test performed to determine a person's vitamin D status, to show vitamin D deficiency or sufficiency. [4] [5] Calcifediol is available as an oral medication in some countries to supplement vitamin D status. [4] [6] [7]
Vitamin D 2 is found in fungi and is produced by ultraviolet irradiation of ergosterol. [161] The vitamin D 2 content in mushrooms increases with exposure to ultraviolet light, [162] and is stimulated by industrial ultraviolet lamps for fortification. [161] The United States Department of Agriculture reports D 2 and D 3 content combined in one ...
Alfacalcidol (or 1-hydroxycholecalciferol) is an analogue of vitamin D used for supplementation in humans and as a poultry feed additive. Alfacalcidol has a weaker impact on calcium metabolism [ 3 ] and parathyroid hormone levels [ 4 ] than calcitriol ; but significant effects on the immune system , including regulatory T cells . [ 5 ]
In addition to its vitamin D content, trout is packed with high-quality protein and heart-healthy omega-3 fatty acids, which can help fight inflammation and support cardiovascular health. Trout ...
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Ergocalciferol may be used as a vitamin D supplement, whereas cholecalciferol (vitamin D 3) is produced naturally by the skin when exposed to ultraviolet light. [15] Ergocalciferol (D 2 ) and cholecalciferol (D 3 ) are considered to be equivalent for vitamin D production, as both forms appear to have similar efficacy in ameliorating rickets ...