One of the best thing about walnuts is that they are rich in minerals such as copper, which is essential to keep your hair from going gray. In fact, copper has ties to color production in your hair. Copper is an essential component that gives your hair its color so eating foods rich in copper is important.
Sesame Seeds Oil
According to sources, sesame seeds oil is great for preventing gray hair because of its copper content. Massage sesame oil on your scalp and consume sesame seed oil in your diet regularly for the best results.