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    Ingredient guide · Ingredient reference

    Vitamin H is biotin: its established role is as an enzyme cofactor

    Vitamin H is another name for biotin, a B vitamin. Its established biochemical role includes helping enzymes carry out metabolic reactions; that role is different from proving a beauty supplement improves hair or nails.

    Read the evidence ↓

    Supplement Science Insights Editorial Team

    Published September 23, 2026

    Biotin assists a defined set of enzymes

    NIH ODS identifies biotin as a cofactor for five carboxylases involved in fatty-acid, glucose and amino-acid metabolism. A cofactor supports enzyme function; it is not itself a supply of extra calories or a universal accelerator of metabolism. [1][2]

    The alternative name vitamin H does not identify an additional vitamin that must be taken separately from biotin. [1][2]

    Normal necessity does not establish benefit from extra intake

    A nutrient can be essential while extra supplementation remains unproven for a particular cosmetic goal. Demonstrating improved hair or nails requires evidence about people, the intervention and the measured outcome. [1]

    Do not treat the enzyme role as a dose recommendation or assume a larger amount means faster results. The product’s full formulation and any relevant testing precautions still matter. [1]

    Two names do not mean two separate nutrients

    Imagine one label says biotin and another says vitamin H. Those names refer to the same vitamin, so combining them should not be interpreted as supplying two different essential nutrients.

    Key distinctions — Vitamin H is biotin
    DetailInterpretation
    Vitamin HAnother name for biotin
    CofactorSupports specific enzymes
    Cosmetic benefitRequires separate evidence
    Vitamin H is biotin: its established role is as an enzyme cofactor — original article outline diagram
    Original editorial diagram of this article’s sections; no product photograph or clinical finding is depicted.

    Sources for this article

    1. Biotin - Health Professional Fact Sheet
      Source consulted: 2026-09-17. This is a reference resource, not a claim that we conducted the studies or tested a product.
    2. Definition of biotin - NCI Dictionary of Cancer Terms - NCI
      Source consulted: 2026-09-17. This is a reference resource, not a claim that we conducted the studies or tested a product.