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2. Cholecalciferol - Wikipedia

   en.wikipedia.org/wiki/Cholecalciferol

   Some unwanted isomers are formed during irradiation: these are removed by various techniques, leaving a resin which melts at about room temperature and usually has a potency of 25 000 000 to 30 000 000 International Units/gram. Cholecalciferol is also produced industrially for use in vitamin supplements from lichens, which is suitable for ...

3. Vitamin D - Wikipedia

   en.wikipedia.org/wiki/Vitamin_D

   Vitamin D 3 (cholecalciferol) is produced industrially by exposing 7-dehydrocholesterol to UVB and UVC light, followed by purification. The 7-dehydrocholesterol is sourced as an extraction from lanolin, a waxy skin secretion in sheep's wool. [203] Vitamin D 2 (ergocalciferol) is produced in a similar way using ergosterol from yeast as a ...

4. Wait, Should You Be Taking Vitamin D2 or D3? - AOL

   www.aol.com/wait-taking-vitamin-d2-d3-150000295.html

   There's lots of confusion around the difference between vitamin D2 and vitamin D3, and which is best for whom. Doctors and experts explain.

5. International unit - Wikipedia

   en.wikipedia.org/wiki/International_unit

   In pharmacology, the international unit (IU) is a unit of measurement for the effect or biological activity of a substance, for the purpose of easier comparison across similar forms of substances. International units are used to quantify vitamins and biologics ( hormones , some medications , vaccines , blood products and similar biologically ...

6. Vitamin D deficiency - Wikipedia

   en.wikipedia.org/wiki/Vitamin_D_deficiency

   In a study by De Niet et al., [72] 60 subjects with vitamin D deficiency were randomized to receive 2000 IU vitamin D3 daily or 50 000 IU monthly. They reported a similar efficacy of the two dosing frequencies, with the monthly dose providing more rapid normalization of vitamin D levels.

7. Vitamin D and neurology - Wikipedia

   en.wikipedia.org/wiki/Vitamin_D_and_neurology

   Vitamin D (the inactive version) is mainly from two forms: vitamin D 3 and vitamin D 2. Vitamin D 3, or cholecalciferol, is formed in the skin after exposure to sunlight or ultra violet radiation or from D 3 supplements or fortified food sources. Vitamin D 2, or ergocalciferol, is obtained from D 2 supplements or fortified food sources. [3]