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I'm taking 4000mcg/day now...not only does it benefit your hair, skin and nails, it helps with slow metabolism, too! An added benefit! Biotin is a water-soluble B-vitamin. After about 3 months of taking it regularly and your hair, nails, and lashes will be growing longer and faster.
Biotin makes hair and nails grow fast and thick. It's good for your skin and gives it a pseudo-tan glow all year long.