Wish there were a magic pill to make nails strong and healthy, and keep them that way?
While it's not a magic pill, some studies have found that the vitamin biotin may help build nail thickness and hardness while reducing the chance of splitting. And for people with brittle, soft nails, this could seem like magic. An easy way to boost your biotin intake is with a supplement, but foods many of us eat every day are also rich in the B vitamin, from salmon to carrots to bananas.
When it comes to other dietary supplements, there really aren't any proven to encourage strong, healthy nails. While some consider calcium to be beneficial for nails, no scientific studies have found that to be true. And those claims that soaking your fingernails in gelatin will boost their strength and length? Well, that's just bunk.