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2. Experts Say This Is Real Difference Between Vitamin D and D3

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   Vitamin D2 vs. D3 Uses. Both vitamin D2 and vitamin D3 will help to increase vitamin D levels in the blood, says Pelitera. However, some studies have shown that supplementing vitamin D3 does a ...

3. Cholecalciferol - Wikipedia

   en.wikipedia.org/wiki/Cholecalciferol

   Low levels of vitamin D3 are more commonly found in individuals living in northern latitudes or with other reasons for a lack of regular sun exposure, including being housebound, frail, elderly, or obese, having darker skin, and wearing clothes that cover most of the skin. [23] [24] Supplements are recommended for these groups of people. [24]

4. Vitamin D2 vs. D3? Are artificial sweeteners bad? Readers ...

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5. Previtamin D3 - Wikipedia

   en.wikipedia.org/wiki/Previtamin_D3

   Previtamin D 3 is an intermediate in the production of cholecalciferol (vitamin D 3). It is formed by the action of UV light, most specifically UVB light of wavelengths between 295 and 300 nm, acting on 7-dehydrocholesterol in the epidermal layers of the skin. [1] [2] [3] The B ring of the steroid nucleus structure is broken open, making a ...

6. Vitamin D - Wikipedia

   en.wikipedia.org/wiki/Vitamin_D

   Vitamin D 2 is found in fungi and is produced by ultraviolet irradiation of ergosterol. [158] The vitamin D 2 content in mushrooms increases with exposure to ultraviolet light, [159] and is stimulated by industrial ultraviolet lamps for fortification. [158] The United States Department of Agriculture reports D 2 and D 3 content combined in one ...

7. Alfacalcidol - Wikipedia

   en.wikipedia.org/wiki/Alfacalcidol

   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 ]