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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 ...
Calcitriol is a hormone and the active form of vitamin D, normally made in the kidney. [8] [9] [10] It is also known as 1,25-dihydroxycholecalciferol.It binds to and activates the vitamin D receptor in the nucleus of the cell, which then increases the expression of many genes. [11]
Cholecalciferol is a form of vitamin D which is naturally synthesized in skin and functions as a pro-hormone, being converted to calcitriol. This is important for maintaining calcium levels and promoting bone health and development. [4] As a medication, cholecalciferol may be taken as a dietary supplement to prevent or to treat vitamin D ...
She adds, "Because natural food sources are limited and most people do not spend enough time in the sun, many foods are fortified or enriched with vitamin D, from cow's milk, to non-dairy milk ...
It’s not an excuse to get more sun exposure. Low vitamin D doesn’t give you a free pass to a day of sun tanning. “Some research suggests that five to 30 minutes of midday sun exposure ...
Salmon is one of the richest natural sources of vitamin D. A 3-ounce serving of cooked salmon provides around 570 IU of vitamin D, covering about 95% of your daily needs. Wild-caught salmon tends ...
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