Bacteria in your intestines produce biotin naturally, but scientists are unclear as to whether or not this location allows for significant absorption by the body. Biotin, also known as vitamin B-7, promotes the growth and health of your hair, skin and nails. Ask your doctor about the advantages of taking a biotin supplement if your hair grows slowly or it appears brittle or damaged.
Function
Biotin, sometimes referred to as vitamin H, assists the body in the conversion of carbohydrates into glucose as well as metabolizing proteins and fats. Biotin contributes to the health of your hair, skin, eyes and liver, according to the University of Maryland Medical Center (UMMC). Biotin also supports the proper function of your nervous system.
Symptoms
Dietary biotin deficiencies are rare, but certain genetic conditions may deplete biotin levels, reports the University of Michigan Health System. Symptoms of biotin deficiency include hair loss and dry, scaly skin around the nose, eyes, mouth or genitals. The Linus Pauling Institute indicates that neurological symptoms of a biotin deficiency in adults may include depression, lethargy, numbness or hallucination. People with a biotin deficiency due to hereditary disorders may experience additional effects, such as a weak immune system and an increased susceptibility to infections.
Benefits
UMMC reports that preliminary findings suggest biotin supplementation may improve and strengthen hair and nails. However, no published studies prove that biotin can prevent or treat alopecia, or hair loss. Other conditions that biotin may aid in treating or preventing include cradle cap in infants, biotinidase deficiency, diabetes and peripheral neuropathy, although additional research is needed in these areas.
Sources
Foods containing small amounts of biotin include liver, egg yolks and brewer's yeast. Biotin is also available as an individual supplement or in B-vitamin complexes and multivitamins. UMMC says 30 mcg is an adequate daily intake of biotin for healthy adults. Breastfeeding women should take 35 mcg a day. If a doctor diagnoses you with a biotin deficiency, he may recommend up to 1,000 mcg daily. Because it is water-soluble, excess biotin is excreted in urine, making it nontoxic.
Considerations
No data exist that suggest biotin will interfere with any medications, but talk to your doctor before beginning a supplement regimen. Certain medications may deplete your body's biotin levels. Long-term use of antibiotics can destroy the bacteria in your intestines that produce biotin. Anticonvulsant medications, such as carbamazepine, phenobarbital, phenytoin and primidone, may also cause biotin deficiencies.
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