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Most adult multivitamins now contain some level of biotin. It can cause involuntary twitching in the legs while at rest - very uncomfortable, but further threats are not known. This is a rare occurrence, but should it happen to you, it is best to stop taking supplements that contain biotin.
Biotin is widely distributed in natural foodstuffs. However, the absolute amounts of biotin in foodstuffs is relatively low when compared with the other B vitamins. Some of the better food sources of biotin, are egg yolk, liver, kidney, pancreas, milk, soya and barley. Brewer's yeast, which is used as a nutritional supplement, is one of the richest sources of biotin, as well as the other B complex vitamins.
Low biotin levels have been linked to the occurrence of eczema, dermatitis, and other skin conditions. Common symptoms of deficiency include dry skin, fungal infections, mild depression, generalized aches and pain, nausea, and vomiting. Supplementation with biotin has been found to prevent hair loss, premature graying, cradle cap, and brittle nails.
From PDF Health
"It has been claimed that supplemental biotin can reverse loss and graying of hair. In fact, biotin and pantothenic acid are widely used in cosmetic hair products. Except in cases of biotin deficiency, there appears to be no basis for this claim."
There is a report, however, that severe hair loss secondary to biotin deficiency occurs in some patients receiving total parenteral nutrition (TPN). Supplementation with 200 micrograms of biotin daily has resulted in gradual regrowth of healthy hair in some of these patients.See also, Vitamin H.
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