Vitamin B7 / Vitamin H / Keratin Synthesis Vitamin
A water-soluble B-vitamin essential for keratin synthesis — the structural protein of hair, skin and nails. While deficiency (rare) causes hair loss and skin rashes, supplementation at 2.5–5mg/day is consistently reported to improve hair thickness, nail strength and skin hydration. Best considered as part of a comprehensive B-vitamin supplement.
Oral 2.5–5mg/day. Note: high-dose biotin (>5mg) can interfere with thyroid and troponin lab tests — inform your doctor.
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