Biotin Biotin is a water-soluble version of Vitamin B, and it's one of the most popular hair growth vitamins out there -- although the research isn't solid. People who experience hair loss (alopecia) are often deficient in biotin, and it's also necessary for cell growth throughout the body. However, a study conducted by the University of Maryland Medical Center found that a surplus of Biotin may not do much your hair and nails. So Biotin supplements may only make a difference if you're deficient. In addition to supplement form, biotin can be found in nuts, eggs, and leafy greens -- and that's how I plan to up my intake.
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