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The main role of biotin in the body is to assist in the metabolism of carbohydrates and fats. Although additional research is needed to determine whether biotin supplements can prevent birth defects in humans, taking a biotin-containing prenatal formula seems a reasonable step for pregnant women, since the vitamin is considered safe and has not been associated with adverse side-effects. Preliminary studies have suggested that biotin in large amounts (such as 5 to 16mg per day) can help control blood sugar levels or improve nerve damage in diabetics. In a study of individuals with dry, splitting nails, supplementation with 2.5mg of biotin per day improved the quality of the nails in 63% of those treated. Improvement was seen after an average of two months, although some individuals did not see results until they had taken biotin for four months. Nevertheless, many multivitamins contain some biotin - it won't do any harm.
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