what is vitamin d synthesized from?
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While it can also be obtained from dietary sources or supplements, vitamin D3 (cholecalciferol) is synthesized in the human skin from 7-dehydrocholesterol upon exposure to ultraviolet-B (UVB) radiation from sunlight (see the separate article on Vitamin D and Skin Health).
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One USP unit of vitamin D2 is equivalent to one International Unit (IU), and 1 mcg of vitamin D2 is equal to 40 USP Units. Each capsule contains Vitamin D (Ergocalciferol) 1.25 mg equivalent to 50,000 USP Units in an edible vegetable oil.
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There are two main kinds of vitamin D—D2 (ergocalciferol) and D3 (cholecalciferol). D2 is found in plant foods, including fungi like mushrooms and yeasts. D3 is only available in animal foods, and it's the type of vitamin D your body makes on its own when it's exposed to UV light.
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Vitamin D Complex features a generous dose of vitamin D, along with efficacious amounts of the other fat-soluble vitamins, A, E (tocopherols and tocotrienols), and K (K1 and K2).
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Vitamin D is not one chemical but many. The natural type is produced in the skin from a universally present form of cholesterol, 7-dehydrocholesterol. Sunlight is the key: Its ultraviolet B (UVB) energy converts the precursor to vitamin D3.
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The short answer is from food, the sun or supplements. There are two main kinds of vitamin D—vitamin D2 and vitamin D3—which you can get from (and occur naturally in) certain foods like salmon, tuna, mackerel and beef liver and egg yolks.
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How Do Vitamin D2 and D3 Differ? There are two main kinds of vitamin D—D2 (ergocalciferol) and D3 (cholecalciferol). D2 is found in plant foods, including fungi like mushrooms and yeasts. D3 is only available in animal foods, and it's the type of vitamin D your body makes on its own when it's exposed to UV light.
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Vitamin D is a fat-soluble vitamin that plays an important role in calcium homeostasis and bone metabolism. Vitamin D deficiency can lead to osteomalacia and rickets in children and osteomalacia in adults.
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Calcifediol is further hydroxylated by the kidneys to form calcitriol (also known as 1,25-dihydroxycholecalciferol), the biologically active form of vitamin D.
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Few foods naturally contain Vitamin D. But eggs are one of the very best natural sources, with Vitamin D in the yolk. And now we've made it even easier to get 'eggs-tra' Vitamin D. That's because our hens' unique diet means they lay eggs with 28% more Vitamin D per 100g than regular eggs.
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Vitamin D2 is ergocalciferol and comes from plant-based sources. Vitamin D3 is cholecalciferol and comes from animal-based sources. Both supplements are processed in the body by the liver to 25-hydroxyvitamin D, though vitamin D3 is thought to provide higher levels of 25D.
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Vitamin D is commonly known as ergocalciferol (Vitamin D2) and cholecalciferol (Vitamin D3). Vitamin D2 and D3 are broken down to their active form, calcitriol, in the body. Calcitriol works by increasing absorption of calcium and phosphorus in the body.
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Vitamin D2 mainly comes from fortified foods like breakfast cereals, milk, and other dairy items. Vitamin D3 is made by your own body when you are exposed to sunlight. It is also found in some foods, including eggs and fatty fish, such as salmon, tuna, and mackerel.
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There are two major types of vitamin D1,2: Vitamin D2 (ergocalciferol) – which is synthesized by plants and is not produced by the human body. Vitamin D3 (cholecalciferol) – which is made in large quantities in the skin when sunlight strikes bare skin.
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There are a few naturally occurring food sources of vitamin D. These include fatty fish, fish liver oil, and egg yolk. Some foods are, however, fortified with vitamin D.
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What is vitamin D3? Vitamin D3 (cholecalciferol) is an over-the-counter vitamin D supplement available in a variety of strengths. It is available in oral tablets and capsules, as well as oral and sublingual solutions. Vitamin D3 comes from animal sources such as fish oil, fatty fish, liver, or egg yolks.
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Vitamin D also promotes bone health. Common sources of vitamin D include tuna, fortified milk, and egg yolks. If you aren't getting enough vitamin D in your diet, talk to your doctor about taking a supplement to meet your recommended daily amount.