Walnut oil can be applied to hair like any other oil. First, warm up a handful of it – just enough to cover your scalp – then apply it to your scalp before taking a shower. Spread the oil all across the scalp by gently massaging it with circle-like motions. Do this for a few minutes and then cover your scalp with a shower cap and/or a towel.
Leave the oil on for about 30 to 40 minutes or up to an hour while you do stuff around the house. Then, simply wash it off in the shower and use your standard shampoo, conditioner, and other treatments. Do this once a week and you should start noticing some improvements pretty soon.