The melanin is the color pigment in your hair follicles. When our bodies stop producing melanin the hair turns gray. Gray hair is cause by excess hydrogen peroxide in in the hair particles that bleaches the hair. Catalase is an enzyme found in almost all living organisms. It catalyses hydrogen peroxide into water and oxygen and protects organisms from free radicals. As we age catalase declines and is necessary to maintain a balance diet to keep our hair from developing gray strands. Many fruits, vegetables and other food types are rich natural sources of this protein, and can help counteract the deficits that come with age.The highest sources of catalase are: leafy green vegetables, sesame seeds, mushroom, flax seeds and more. Luckily there are also other dietary sources of glutathione that can help maintain younger looking hair by reducing hydrogen peroxide. The food containing the highest sources are asparagus, beef, fish, poultry, spinach, avocados, asparagus, okra broccoli, kale, collards, cabbage, cauliflower, and watercress. Include several of these ingredients in your daily diet such as raw vegetables to get the maximum level of benefits. Increase intake of vitamin B12 to decrease production of hydrogen peroxide. Great sources of vitamin B12 are clam, beef, liver, salmon, tuna, egg, and yogurt. Including fruits into your diet might keep hydrogen peroxide at bay. Apples, cherries, berries, lime and bananas. All of these actions increase glutathione peroxidase and Catalase. Stay active by exercising to improve overall function of the body. Avoid smoking, alcohol, exposure to mercury and sun bathing.