Biotin, also known as vitamin B7 or H, is a water-soluble vitamin that plays a key role in numerous metabolic processes, including the synthesis of fatty acids, glucose production, and the metabolism of amino acids.
Its popularity in the health and beauty industry stems from its purported benefits for hair, skin, and nail health. While biotin is widely marketed as a miracle ingredient for luscious locks, understanding the science behind its effects on hair growth is crucial.
Biotin is a member of the B-vitamin family and serves as a coenzyme for carboxylase enzymes involved in critical biological pathways. These enzymes are essential for producing energy and maintaining the structural integrity of cells.
Biotin can be found in various foods, including eggs, nuts, seeds, whole grains, and certain vegetables like spinach and broccoli.
Hair is primarily composed of keratin, a structural protein that provides strength and resilience. Biotin supports keratin production by aiding in the metabolism of amino acids, the building blocks of proteins.
By enhancing keratin infrastructure, biotin may contribute to healthier, thicker hair strands. Additionally, biotin supports energy production in hair follicles, enabling them to function efficiently during the anagen (growth) phase of the hair cycle.
Studies on biotin’s direct impact on hair growth, however, remain limited. Most existing research focuses on individuals with underlying biotin deficiencies, where supplementation has been shown to reverse hair thinning and promote regrowth.
One of the most cited studies on biotin and hair health involved women with thinning hair who took a biotin supplement for 90 days. The results showed a significant improvement in hair volume, scalp coverage, and thickness compared to the placebo group.