Vitamin E is a powerful antioxidant that can actually absorb damaging UV light and protect skin cells. It also repairs sun damage on the scalp, which can cause hair to thin. In one study, “Tocotrienols, or different types of vitamin E supplements, were studied for eight months in patients with hair loss,” says Debé. Thirty-eight people received the supplement, and some received a placebo. The supplemented group had a 34% improvement in hair growth.” Debé notes that although the amount of tocotrienols used in this study is difficult to get from diet alone, barley is a very good source.