QUESTION: "My nails are brittle and peeling. How can I make them healthier?" ANSWER: Start by increasing your intake of biotin, says Great Neck, N.Y. dermatologist Jeannette Graf. The nutrientfound in almonds, dark greens and eggs as well as in supplement formhas been proven to strengthen nails. Then apply a salve like J.R. Watkins Naturals Mango Hand & Cuticle Salve ($9; jrwatkins.com) or cuticle oil over the entire nail bed every night before bed. We like the Sally Hansen Quick Care Cuticle Treatment ($10; walgreens.com). "This adds hydration and makes it more supple," says L.A. manicurist Jenna Hipp, who works with Jessica Alba and Eva Longoria.