Oily hair is caused by over-production of sebum, the nourishing oily, moisturising substance produced by the body to moisturise and protect skin and hair. All hair textures, curly or fine, can have oily hair. Whilst it might seem that avoiding moisturising hair and washing it daily is the key, this is not the case. Blueberry Oil is a light oil that is rich in proanthocyanidins that are said to be highly nutritious to hair and scalp.  Cucumber extract is said to promote light healthy hydration in hair without weighing hair down.