Biotin (vitamin B7) is a water-soluble coenzyme essential to fatty-acid synthesis, amino-acid metabolism, and energy production, with direct implications for keratin infrastructure and epidermal barrier function.

Insufficiency is associated with dry, flaky skin, brittle nails, and hair thinning, whereas supplementation helps normalize sebum regulation, support barrier integrity, and improve hair and nail strength.

Authoritative adequate intakes are 30 µg/day (NIH) and 40 µg/day (EFSA), yet functional, beauty-oriented interventions commonly employ 300-1000 µg/day in populations with marginal status.

The Keyora formulation supplies 600 µg/day, a precision-nutrition dose that exceeds basic requirements while remaining well within established safety limits; long-term intakes up to 2500 µg/day have shown no adverse effects.

Clinically, biotin contributes to improvements in hair quality (reduced brittleness and thinning), increases nail hardness and thickness over ≥6 months, and alleviates xerosis by supporting epidermal lipid homeostasis.

Within comprehensive nutricosmetic formulations, biotin complements collagen tripeptides, elastin peptides, hyaluronic acid, ceramide NP, Niacinamide, and vitamin C - together addressing structural protein synthesis, elastic-matrix support, hydration, and barrier repair.

This evidence positions oral biotin as a safe, mechanistically coherent, and synergistic component of long-term beauty-from-within strategies for hair, nails, and skin.