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Biotin—also known as vitamin B7 and vitamin H—is a member of the B vitamin family. Its primary functions in the body are to assist with the metabolism of fats, carbohydrates, and proteins, and to help with cell growth and facilitate the utilization of the other B vitamins. Biotin also has proved helpful in lowering and controlling the blood sugar levels in people with either insulin-dependent or non-insulin-dependent diabetes.

Good Food Sources: Soy, whole grains, egg yolk, almonds, walnuts, oatmeal, mushrooms, broccoli, bananas, peanuts, liver, kidney, milk, legumes, sunflower seeds, and nutritional yeast.

Signs of Deficiency: Signs of biotin deficiency include depression, hair loss, high blood sugar, anemia, loss of appetite, insomnia, muscle cramps, nausea, and a sore tongue. In addition, low biotin levels have been linked to seborrheic dermatitis in infants; biotin’s role in causing this condition in adults has not been established.

    Biotin deficiency is very rare, in part because this vitamin can be manufactured by the intestines from other foods. Long-term use of antibiotics, however, can hinder production of biotin and lead to deficiency symptoms. Signs of deficiency are also seen in people who regularly consume raw egg whites, which contain a protein called avidin that prevents the absorption of biotin into the blood. Uses of Biotin: Biotin is used in the treatment of diabetes .

Dosage Information: The adult RDA is 100 to 200 micrograms; the therapeutic dose is 200 micrograms. Purchase either a multivitamin–mineral supplement or a B-complex formula that contains biotin. Most people do not need to take a separate biotin supplement unless they are treating diabetes, in which case it is recommended you do so under a doctor’s guidance.

Possible Side Effects: Biotin is a nontoxic, water-soluble vitamin; if excessive amounts are taken, it is excreted in the urine without causing adverse effects. People with diabetes who are taking insulin may need to decrease their insulin dosage if they take more than 4 milligrams of biotin daily; diabetics should be under a doctor’s care.

Possible Interactions: Biotin works in conjunction with the other B vitamins. Substances that can interfere with bioavailability of biotin include antibiotics, saccharin, and sulfa drugs.