![]() ![]() When the active form of vitamin D binds to this receptor, it turns genes on or off, leading to changes in your cells. Calcitriol interacts with the vitamin D receptor (VDR), which is found in almost every single cell in your body. This is the active, steroid-hormone form of vitamin D. Second, it is converted to calcitriol, or 1,25(OH)2D, mostly in your kidneys. ![]() First, it is converted to calcitriol, or 25(OH)D, in your liver. Vitamin D needs to undergo two conversion steps to become active (8Trusted Source, 9Trusted Source). Of the two, D3 (cholecalciferol) seems to be almost twice as effective at increasing blood levels of vitamin D as D2 (ergocalciferol) (6Trusted Source,.Vitamin D2 (ergocalciferol). Found in some plants, mushrooms, and yeasts.Vitamin D3 (cholecalciferol). Found in some animal foods, like fatty fish and egg yolks.Two main dietary forms exist (5Trusted Source): Vitamin D is a fat-soluble vitamin, meaning that it dissolves in fats and oils and can be stored in your body for a long time.This article explains everything you need to know about vitamin D. Yet only a handful of foods contain significant amounts of this crucial vitamin, and deficiency is very common. For this reason, vitamin D is often referred to as “the sunshine vitamin.” However, sun exposure rarely provides adequate vitamin D, making it necessary to obtain it from supplements or your diet. In fact, it’s a steroid hormone produced from cholesterol when your skin is exposed to the sun. Vitamin D is completely different than most other vitamins. ![]()
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