For most people, having an oily hair is a big problem because it is hard to manage and style. Even if the hair was washed in the morning, come evening it will look awful and greasy. So what is the reason behind oily hair? The answer to that are the sebaceous gland and its excessive secretion of Sebum. It is a natural moisturizer that is not only found in the scalp, but also on the face. In reality, it is not the hair itself that is greasy, but the scalp. The Sebum goes into the hair making it look oily. For this reason, in order to have a less greasy hair, we have to work on the scalp first. A shampoo that targets oily hairs can lessen the amount of Sebum released by the scalp, making the hair look fresh and clean all day.