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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. How to get the most out of vitamin D3
7-Dehydrocholesterol (7-DHC) is a zoosterol that functions in the serum as a cholesterol precursor, and is photochemically converted to vitamin D 3 in the skin, therefore functioning as provitamin-D 3. The presence of this compound in human skin enables humans to manufacture vitamin D 3 (cholecalciferol).
Unlike the other twelve vitamins, vitamin D is only conditionally essential - in a preindustrial society people had adequate exposure to sunlight and the vitamin was a hormone, as the primary natural source of vitamin D was the synthesis of cholecalciferol in the lower layers of the skin’s epidermis, triggered by a photochemical reaction with ...
Most people in the world depend on the sun to get vitamin D, [31] and elderly populations in low UVB countries experience higher rates of cancer. [32] There are not many foods that naturally have vitamin D. [33] Examples are cod liver oil and oily fish. If people cannot get sunlight, then they will need 1,000 IU of vitamin D per day to stay ...
Vitamin D3 needs for the average adult between the ages 19 and 70 years old is 600 IU (15 mcg) per day, says Pelitera. “This includes foods, for example, 1 cup of fortified milk contains about ...
“It also may play an important role in our immune system and decrease the risk of cardiovascular disease.” There are two sources of vitamin D: Vitamin D2 comes from fortified foods and ...
Additionally, vitamin D3 deficiency, common in older adults due to reduced skin synthesis and limited sun exposure, further disrupts calcium homeostasis by decreasing intestinal absorption of calcium. [173] As kidney function declines with age, the conversion of vitamin D3 to its active form is impaired, exacerbating the deficiency.
But “vitamin D3 is more bioavailable (a.k.a has a stronger ability to be absorbed and used in the body), which is why people tend to prefer vitamin D3," says JoAnn Manson, M.D., MPH, DrPH, a ...
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