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Biotin, or vitamin H, is an important compound found in the blood. It is crucial for helping the liver, eyes and nervous system to function properly. It also has a role in keeping hair and nails healthy.

What might a low result mean?

Low levels of biotin can be caused by Crohn's disease, prolonged oral antibiotic therapy and pregnancy.

What might a high result mean?

Elevated levels of biotin can be caused by excessive intake of the vitamin, for example by taking too many supplements.