維他命d3 相關
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The major natural source of vitamin D is synthesis of cholecalciferol in the lower layers of the epidermis of the skin, through a photochemical reaction with Ultraviolet B (UV-B) radiation from sun exposure or UV-B lamps. [1] Cholecalciferol and ergocalciferol can be ingested from the diet and supplements.
Cholecalciferol (vitamin D3) appears to stimulate the body's interferon type I signaling system that protects against bacteria and viruses, unlike vitamin D 2. For psoriasis, cream that includes vitamin D3 can have a good effect, or UVB phototherapy. Vitamin D
Vitamin D receptor. The vitamin D receptor ( VDR also known as the calcitriol receptor) is a member of the nuclear receptor family of transcription factors. [5] Calcitriol (the active form of vitamin D, 1,25- (OH) 2 vitamin D 3) binds to VDR, which then forms a heterodimer with the retinoid-X receptor.
Vitamin D deficiency or hypovitaminosis D is a vitamin D level that is below normal. It most commonly occurs in people when they have inadequate exposure to sunlight, particularly sunlight with adequate ultraviolet B rays (UVB).[1] [2] [3] Vitamin D deficiency can also be caused by inadequate nutritional intake of vitamin D; disorders that limit vitamin D absorption; and disorders that impair ...
Calcifediol, also known as calcidiol, 25-hydroxycholecalciferol, or 25-hydroxyvitamin D3 (abbreviated 25 (OH)D3 ), [1] is a form of vitamin D produced in the liver by hydroxylation of vitamin D 3 (cholecalciferol) by the enzyme vitamin D 25-hydroxylase.
Previtamin D3 is an intermediate in the production of cholecalciferol ( vitamin D 3 ). It is formed by the action of UV light, most specifically UVB light of wavelengths between 295 and 300 nm, acting on 7-dehydrocholesterol in the epidermal layers of the skin. [1] [2] [3]
Vitamin K2 or menaquinone ( MK) ( / ˌmɛnəˈkwɪnoʊn /) is one of three types of vitamin K, the other two being vitamin K 1 ( phylloquinone) and K 3 ( menadione ). K 2 is both a tissue and bacterial product (derived from vitamin K 1 in both cases) and is usually found in animal products or fermented foods. [1]