benefits of olive oil for human health Olive oil mixed with lemon juice may help treat problem dandruff. Usually caused by dry, flaky skin, the acidic lemon juice helps loosen dandruff as the olive oil moisturizes the new, exfoliated layer of skin. Mix equal levels benefits of olive oil for hair and skin of olive oil, lemon juice and water – a couple of tablespoons of each and every should suffice. Massage into damp scalp, leave on for 20 minutes, rinse and shampoo. Make use of this flake-fighting treatment less than several week.