Vitamin C
Free radical damage can resist growth and result in aging of your hair. Vitamin C is another powerful antioxidant that aids in protecting against the oxidative stress resulting due to free radicals. Moreover, our body needs vitamin C to build a hair protein known as collagen which ultimately plays a key role in forming hair structure. Vitamin C also aids in the absorption of iron, a mineral which is necessary for the growth of hair. Citrus fruits, peppers, guavas, and strawberries are all best sources of vitamin C.