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Vitamin D3, aka cholecalciferol, is important for bone health and immune function. Experts discuss benefits, sources, risks and who needs a supplement.
While some studies have found that vitamin D 3 raises 25(OH)D blood levels faster and remains active in the body longer, [42] [43] others contend that vitamin D 2 sources are equally bioavailable and effective for raising and sustaining 25(OH)D. [44] [45] If digestive disorders compromise absorption, then intramuscular injection of up to ...
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 ...
2. Vitamin B12. One of eight B-complex vitamins, vitamin B12 is found naturally in some types of fish, red meat and fortified foods.It plays a key role in central nervous system function, DNA ...
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]
The term vitamin does not include the three other groups of essential nutrients: minerals, essential fatty acids, and essential amino acids. [2] Major health organizations list thirteen vitamins: [3] [4] [5] Vitamin A (all-trans-retinols, all-trans-retinyl-esters, as well as all-trans-β-carotene and other provitamin A carotenoids) Vitamin B 1
Preformed vitamin A is fat-soluble and high levels have been reported to affect metabolism of the other fat-soluble vitamins D, [24] E, and K. The toxic effects of preformed vitamin A might be related to altered vitamin D metabolism, concurrent ingestion of substantial amounts of vitamin D, or binding of vitamin A to receptor heterodimers .
D3 is better at raising blood levels of vitamin D, but D2 also works well. The main thing, says Dr. Manson, is to take whichever you choose along with a bit of food that contains fat .