Natrol Biotin Fast Dissolve is the preferred choice when it comes to restoring your naturally lustrous hair and resilient nails while keeping your diet and shape on track! The Natrol Biotin you trust in Fast Dissolving form! Clinical studies have shown that those deficient in biotin experience hair loss, brittle nails and unhealthy skin. Biotin plays a key-role in the body and is the important nutrient for the growth and maintenance of your hair, nails and glowing skin.