Vitamins B6, B12, and folic acid are also important to your hair. Vegetarians and vegans often don't get enough of these vitamins.
Good sources of vitamin B-6 include bananas, potatoes (both white and sweet), and spinach.
Eating plenty of fresh fruits and vegetables -- especially citrus fruits and tomatoes -- will help you get folic acid. Whole grain and fortified grain products, beans, and lentils also contain folic acid. Major sources of B12 include meat, poultry, fish, and dairy products.
Protein is also critical for keeping hair healthy, but many people don't get enough. Lean meat like fish, chicken, eggs, and soy products are good sources of protein; eat one serving every day.
Because trace minerals like magnesium,zinc, and biotin also affect hair, it's a good idea to take a daily multivitamin.