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| It can be acquired either by ingestion or by exposure to sunlight. Vitamin D2 (ergocalciferol) is obtained from plants. Vitamin D3 (cholecalciferol) is stable to heat, light, and storage and is derived from animal products. For comparison, human breast milk contains only 4 to 60 IU per quart. It is estimated that the RDA can be achieved through the exposure of 30% of a persons skin surface to the sun for 30 minutes at moderate latitudes. If longer exposure times are had, even with the darkest skin color, sufficient levels of vitamin D are produced. Care must be taken in treating vitamin D deficiency, since high doses of vitamin D are toxic and can result in the permanent deposit of minerals in the heart, lungs and kidneys. In adults, vitamin D toxicity occurs with eating 50,000 IU or more per day. In infants, toxicity occurs with 1,000 IU per day. |
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