Vitamin D, 25-Hydroxy

The main function of vitamin D in the body deals with calcium absorption, transport, deposition, and metabolism. Decreased levels can result in symptoms involving disturbed calcium use, nerve and muscle impairment, soft or fragile bones, or, if severe enough, the classic disease called rickets. An excellent source of vitamin D is sunshine on the skin, 15 to 20 minutes daily. Other sources of vitamin D are butter, eggs, milk, cod liver oil, and cold-water fish.

The RDA for vitamin D is 600 I.U. A suggested supplemental level is 600 to 1000 I.U. 2000 I.U./day can lead to toxicity.

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