Along with the other fat soluble vitamins A, E and K, vitamin D dissolves more easily in oil than in water. This gives vitamin D the duel identity as a fat-soluble vitamin and a hormone. Vitamin D is required for the normal growth and development of bones and teeth in children. Normal muscle contraction and nerve function is supported by vitamin D. Studies have shown possible anti-cancer properties, especially for myeloid leukemia, breast and colon cancers. Being exposed to sunlight for fifteen minutes, three times a week can provide adequate amounts of vitamin D. For the elderly or those in northern climates, not exposed to adequate sunlight, an intake of 400-800 I.U. daily is recommended.
Vitamin D is fat soluble so excess amounts are stored by the body.
Supplements containing more than 400 I.U. are generally not required and should not be taken unless ordered by a physician. Vitamin D should not be taken without calcium. You should always advise your physician of all over the counter medications you are taking. This includes all vitamins, minerals, supplements and herbs. The Alternative Advisor Zoe Brenner, et.