As of 2015, biotin isn't known to cause major side effects in doses up to 10 milligrams per day, indicates Drugs.com. Minor side effects may include upset stomach or mild skin rash. Individuals experiencing signs of an allergic reaction, such as hives or difficulty breathing, should see a doctor immediately.
Biotin is used to treat biotin deficiency or as an alternative therapy for other conditions, such as hair loss, skin rash in infants, diabetes, mild depression and brittle nails, states WebMD. Biotin deficiency may result from rapid weight loss, pregnancy, extended tube feeding or malnutrition. Symptoms of biotin deficiency include listlessness, thinning hair, a red scaly rash on the face, hallucinations, depression, and tingling of the extremities. As of 2015, there is some evidence that cigarette smoking or diabetes may cause biotin deficiency.
Biotin is also referred to as vitamin H. It is found naturally in many foods, such as cooked egg, brewer's yeast, nuts, sardines, whole grains, legumes, soy beans, cauliflower, bananas and mushrooms, indicates the University of Maryland Medical Center. Biotin is one of the B-complex vitamins. It helps the body convert food into fuel and helps metabolize amino acids and fats. B-complex vitamins support the nervous system and are necessary for healthy eyes, liver, hair and skin.