What Is Biotin (Vitamin H)?

Biotin, also known as vitamin H or vitamin B7, is a water-soluble B-complex vitamin that plays a crucial role in energy, fat, and protein metabolism. It is essential for converting nutrients into energy and acts as a coenzyme in numerous metabolic reactions. Biotin is also widely known as the “beauty vitamin” because it contributes significantly to the health of skin, hair, and nails.

The name “vitamin H” comes from the German word Haut (skin) – and biotin is indeed essential for the structure and regeneration of skin cells. Since the body cannot store large amounts of biotin, it needs to be regularly obtained through the diet. Natural sources include eggs, nuts, oatmeal, soybeans, whole grains, liver, fish, cauliflower, and spinach.

How Does Biotin Work?

Biotin is a component of important enzymes involved in key metabolic processes. It acts as a coenzyme in four biotin-dependent carboxylases that convert carbohydrates, fats, and amino acids into usable energy. Without biotin, these biochemical processes would stop, affecting energy, metabolism, and cell regeneration.

Energy and metabolic regulation:
Biotin is needed for the activity of enzymes that build and break down fatty acids, metabolize amino acids, and produce glucose from non-carbohydrate sources (gluconeogenesis). This helps stabilize blood sugar levels and provides a steady supply of energy.

Skin, hair, and nails:
Biotin is one of the most important vitamins for cell renewal and keratin production – the structural protein that makes up hair and nails. It strengthens hair roots, promotes growth, improves resilience, and helps prevent brittleness. Biotin is also essential for the skin: it supports the barrier function, helps retain moisture, and may have a positive effect on blemishes, eczema, or dry skin.

Nervous system:
As a coenzyme in the synthesis of neurotransmitters, biotin contributes to the normal function of the nervous system. It supports communication between nerve cells and may therefore promote concentration and mental performance.

Pregnancy and growth:
The need for biotin increases during periods of heightened cell division – such as pregnancy or growth. It plays an important role in embryonic development and cell maturation, making adequate intake particularly important during this time.

Benefits of Biotin

  • Supports energy production from fats, carbohydrates, and proteins

  • Promotes healthy hair growth and helps prevent hair loss

  • Strengthens nails and improves their structure and strength

  • Supports skin regeneration and helps combat dryness and irritation

  • Contributes to the normal function of the nervous system and mental performance

  • Supports metabolic processes and helps stabilize blood sugar levels

  • Promotes growth and cell division during periods of increased demand

Possible Side Effects and Interactions

Biotin is extremely well tolerated. Since it is water-soluble, excess amounts are excreted in the urine. An overdose is practically impossible.

Deficiency is rare, but can be caused by an unbalanced diet, alcohol abuse, certain medications (e.g., antibiotics), or eating raw eggs, since the avidin they contain binds biotin and prevents its absorption. Symptoms of deficiency include hair loss, brittle nails, dry skin, fatigue, low mood, and muscle pain.

Very high doses of biotin can affect laboratory test results (e.g., thyroid or cardiac markers), so people who regularly take biotin supplements should mention this before having blood tests.

Conclusion

Biotin is a versatile vitamin that supports metabolism, energy, and beauty from within. It helps the body produce energy, strengthens skin, hair, and nails, and contributes to a stable nervous system. Adequate biotin intake is particularly important during periods of increased demand, for skin or hair concerns, or during pregnancy. A balanced diet rich in nuts, whole grains, and vegetables, or a high-quality supplement, can help preserve vitality and outward appearance over the long term.

Sources

  1. Zempleni J, Hassan YI, Wijeratne SS. (2008): Biotin and biotinidase deficiency. Expert Rev Endocrinol Metab, 3(6), 715–724.

  2. Mock DM. (2017): Biotin: from nutrition to therapeutics. J Nutr, 147(8), 1487–1492.

  3. Rodriguez-Melendez R, Zempleni J. (2003): Regulation of gene expression by biotin. J Nutr Biochem, 14(12), 680–690.

  4. Kuroishi T. (2015): Regulation of immunological and inflammatory functions by biotin. Can J Physiol Pharmacol, 93(12), 1091–1096.