Best for: All nail types

Fish oil is chock-full of omega 3 fatty acids, which have been linked to longer, stronger nails and shinier hair (not to mention clearer skin, thanks to its anti-inflammatory benefits) -- though there is no definitive scientific research.

Try: Carlson Fish Oil, $12.90 -- Far's favorite supplement for strong, healthy nails. "It makes a world of difference for my nails and hair when taken daily."