“Biotin is a must have in my daily routine” —Christine, Nuzena customer The Key To Stunning And Vibrant Hair, Skin, and Nails Biotin Pure + offers a pure dosage of biotin and calcium that’s benefits include: helping to strengthen hair fibers, increase hair volume, improve hair quality, and even promote hair regrowth. Biotin is also a catalyst in improving nail strength, and quality. Biotin can also help to nourish your skin and improve signs of aging such as dryness and wrinkles.