Biotin is a water-soluble B vitamin that is critical for various metabolic and enzymatic functions in the human body. For example, biotin is an essential cofactor for carboxylase enzymes, which contribute to fatty acid synthesis, generation of glucose from certain non- carbohydrates, and breakdown of amino acids.1,2
Historically, there has been significant
interest in biotin for skin, hair, and nail health. Biotin is broadly available in dietary sup- plements marketed for these uses, and it is often provided in supratherapeutic doses such as 10,000 mcg/serving. There are no known physical safety risks in using a supratherapeu- tic dose of biotin. However, high-dose biotin can interact with certain laboratory tests, resulting in false results. This risk is typically not included on the supplement label.1,3
Recommended (or Suggested) Intakes
There is currently not enough information to establish recommended daily intakes for biotin. However, the National Academy of Medicine determined Adequate Intakes for biotin, as shown in Table 1.1
Table 1 Dietary Reference Intakes for Biotin1 Life-stage group