The Role of Biotin in Metabolism and Overall Health

Biotin, also known as vitamin B7 or sometimes referred to as vitamin H, is a water-soluble B-complex vitamin that plays a crucial role in maintaining the body’s overall metabolic health. It functions as a coenzyme, assisting enzymes that transfer carbon and oxygen atoms between molecules within cells. Through these biochemical reactions, biotin helps convert food into usable energy by aiding the metabolism of fats, carbohydrates, and proteins. This makes it essential for supporting the body’s natural energy production and for maintaining normal physiological functions.

One of biotin’s most important roles is in the synthesis of fatty acids and amino acids—key building blocks for healthy cell growth and tissue repair. This contributes to the maintenance of healthy skin, hair, and nails, which is why biotin is often found in beauty supplements. Additionally, biotin supports nervous system function and helps regulate gene expression, further emphasizing its role in sustaining good health.

Biotin can be obtained naturally from a variety of foods. Excellent sources include liver, egg yolks, yeast, nuts (especially almonds and walnuts), seeds, and legumes such as beans and lentils. Certain fish, such as salmon, are also rich in biotin; just two ounces of salmon can provide about 25 percent of the Adequate Intake (AI) for adults. Although there is no established Recommended Dietary Allowance (RDA) for biotin, deficiencies are rare. This is because gut bacteria naturally synthesize sufficient amounts of the vitamin to supplement dietary intake.

In general, a balanced diet provides all the biotin the body needs. However, maintaining diverse food choices—particularly those rich in whole grains, nuts, and eggs—ensures that the body has enough of this vital nutrient to support healthy metabolism, growth, and overall vitality.
The Role of Biotin in Metabolism and Overall Health

Vitamin B7 or biotin

Using feeding studies with dried egg white, Boas first described in 1927 that mammals require the water soluble vitamin biotin.

Biotin is a bicyclic compound; one of the rings contains an ureido group and the other contains sulfur in a tetrahydrothiophene ring with a valeric acid side chain. It is an imidazole derivative with chemical structure C10H16N2O3S1.

Like other B vitamins, biotin acts as coenzymes in dozens of reactions. Among these reactions are amino acid metabolism, including the conversion of amino acids to glucose; fatty acid synthesis; release of energy from fatty acids and DNA synthesis.

Novel roles for biotin in cell signaling, epigenetic control of gene expression and chromatin structure have also been discovered.

In food, mostly meats and protein, biotin is found both free and bound to protein. The protein bound form can liberated via proteases yielding free biotin forms, predominantly biotin and secondary biocytin.

Good sources of biotin include cauliflower liver, peanuts and cheeses. Egg yolks are also a good source of biotin but a protein called avidin in raw egg whites bonds biotin and prevents its absorption from raw eggs. Biotin deficiency leads to impairment of gluconeogenesis and fat metabolism.

Biotin deficiencies can also induce severe metabolic acidosis. The first manifestation of biotin deficiency is a depressed biotin level in urine. Subsequently, the following clinical signs may develop: dermatitis, conjunctivitis, alopecia and central nervous system abnormalities.
Vitamin B7 or biotin