Olive oil for hair isn’t anything new. It’s been used for centuries as a hair conditioner by women all over the world. The light oil is rich in antioxidants, vitamin A and vitamin E. All three work together to lock in moisture, soften the texture and protect keratin in each strand (keeping the hair strong and thick). And it isn’t only a cure for dry hair. For oil-prone hair, it helps to control buildup of sebum (the hair’s natural oils). This helps to promote growth by leaving hair follicles open.