Vitamins - Import export

There are two types of Vitamin D. Vitamin D2 (ergocalciferol) is obtained from food. It is metabolized by liver to its active form 25 hydroxycalciferol [25 OHD2]. Vitamin D3 (cholecalciferol) is synthesized in skin by sunlight's UV rays. It is metabolized by liver to 25 dihydroxycalciferol [25 OH D3] is involved in many biochemical functions including calcium and bone metabolism regulation. Vitamin D deficiency is associated with Ricketts, osteomalacia, depression and impaired cognitive function. Elevated Vitamin D levels decrease depression. High-dose vitamin D3 is also used to prolong remission intervals in multiple sclerosis (MS) patients.

Vitamin D5，a member of the family Vitamin D wich was discovered by Edward Mellanby in 1919 during his classic experiments with rickets, is about 180-fold less active than vitamin D3, in calcification of rachitic cartilage and about lOO- to 200-fold less active in induction of bonecalcium mobilization. In stimulation of intestinal-calcium transport, vitamin D5 is about 80 fold less active than vitamin D3. More information, please visit the website:http://www.bocsci.com/vitamin-d5-cas-71761-06-3-item-453668.html

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