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Vitamin D (ergocalciferol-D2, cholecalciferol-D3, alfacalcidol) is a fat-soluble vitamin that helps your body absorb calcium and phosphorus. Having the right amount of vitamin D, calcium, and phosphorus is important for building and keeping strong bones.
Sulphur Helps Mobilize Vitamin D from the Sun? When unprotected skin is exposed to the sun, the skin synthesizes vitamin D3 sulfate. While vitamin D is normally considered fat soluble, vitamin D3 sulfate is a form of the vitamin that is actually water soluble. This allows this type of vitamin D to travel freely in the blood stream. On a side note, the vitamin D3 in supplements is not the same vitamin D3 as what you get from the sun and should not be considered an adequate substitute.