What is Biotin (Vitamin H)?

Biotin, also known as Vitamin H or Vitamin B7, is a water-soluble vitamin from the B-complex 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. In addition, biotin is widely known as the “beauty vitamin” because it makes a significant contribution to the health of the skin, hair, and nails.

The name “Vitamin H” is derived from the German word Haut – and indeed, biotin is of central importance for the structure and regeneration of skin cells. Since the body cannot store biotin in large quantities, regular intake through the diet is necessary. Natural sources include eggs, nuts, oatmeal, soybeans, whole-grain products, liver, fish, cauliflower, and spinach.

How does biotin work?

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

Energy and metabolic regulation:
Biotin is necessary for the activity of enzymes that build and break down fatty acids, metabolize amino acids, and produce glucose from non-carbohydrate sources (gluconeogenesis). As a result, it supports the stabilization of blood sugar levels and ensures 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 hair and nails are made of. It strengthens the hair roots, promotes growth, improves resilience, and helps prevent brittleness. Biotin is also essential for the skin: it supports the barrier function, promotes moisture retention, and may have a positive effect on skin 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 can therefore promote concentration and mental performance.

Pregnancy and growth:
During periods of increased cell division – such as pregnancy or growth – the need for biotin increases. It plays an important role in embryonic development and cell maturation, which is why sufficient intake during this time is particularly important.

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 firmness

  • 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 stabilizes blood sugar levels

  • Promotes growth and cell division during periods of increased stress

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.

A deficiency is rare, but may result from an unbalanced diet, alcohol abuse, certain medications (e.g., antibiotics), or eating raw eggs, as the avidin they contain binds biotin and prevents its absorption. Symptoms of a deficiency include hair loss, brittle nails, dry skin, fatigue, depressive moods, and muscle pain.

Very high doses of biotin can affect laboratory values (e.g., thyroid or cardiac parameters), which is why people who regularly take biotin supplements should disclose this before blood tests.

Conclusion

Biotin is a versatile vitamin that supports metabolism, energy, and beauty from within. It helps the body produce energy, strengthens the skin, hair, and nails, and contributes to a stable nervous system. Sufficient biotin intake is particularly important during periods of increased stress, in cases of skin or hair problems, or during pregnancy. A balanced diet containing nuts, whole-grain products, and vegetables, or a high-quality supplement, can help preserve vitality and an attractive 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.