How to Grown Stronger, Healthier Nails
One word: Biotin
Your nails are made of the protein keratin, and studies have shown that taking supplements of this B vitamin may improve the strength and thickness of weak nails. For best results, you need at least 2.5 milligrams daily, says NYC–based dermatologist Lenora Felderman, MD. Expect to see progress in three to six months—the average length of time it takes for a new nail to grow in.