Salmon is a wonderful food for healthy hair. Eating salmon, which is packed with omega-3 fatty acids, will work wonders in supporting a healthy scalp. A deficiency in omega-3’s can increase your chances for developing a dry scalp, which will make for dull and lifeless hair. Salmon is also high in protein, as well as vitamin B-12 and iron. If you would rather not eat salmon, you can sprinkle ground flaxseed on your food as a substitute.