[" Best multi-tasker: Biotin. Nature's Bounty. ... ", ' Best for hair loss (splurge): Nutrafol. Nutrafol. ... ', ' Best for hair loss (budget): Viviscal. Viviscal. ... ', ' Best for brittle, weak hair, skin, and nails: Cysteine. NOW supplements. ... ', ' Best for dryness: Vitamin A.']