Split nails, strawlike hair, and dry, lackluster skin? Could be a vitamin deficiency. The big beauty player appears to be antioxidants, which are free radical scavengers. "High-energy molecules called free radicals, which are ever present in the atmosphere, cause major damage to our skin cells and the DNA within the cells," explains David Bank, a dermatologist in Mt. Kisco, New York. "Antioxidants act like shock absorbers, taking the hit themselves and protecting your skin." The following slides reveal which foods you should eat to get your dose of antioxidants and other skin-boosting nutrients.