When it comes to nontoxic and natural, first things first—start with your diet.
Your nails are made of keratin, which is a structural protein, and a protein-rich diet, full of foods like beans, lean meats and nuts, is going to help keep them healthy and strong. Deficiencies often show up in your nails, too. Lines or white spots can indicate you need more zinc. Brittle nails might mean more protein or iron. Split or peeling nails need water. Fact is, your nails are often trying to tell you something about your overall health—be sure to listen.