I have very thick, oily hair and have tried many different shampoos. I have used many other shampoos with very little success. I was having my hair cut one day at a salon and the beautician was having a difficult time combing my hair (even though I had washed it before the appointment). She suggested rewashing my hair with Design Line's Olive Oil shampoo. It was amazing! My hair was virtually tangle free (an occurrence which rarely happens with my hair). Not only was it much more manageable but it looked great! It appeared clean and healthy! I bought some that day and have been using it ever since! My husband even started using it as well. He has black hair that tends to be oily too. Now we both use only this olive oil shampoo. I also use the conditioner and it works very well. I cannot say enough about Design Line's Olive Oil shampoo. If you have oily hair and have been searching for a shampoo that will keep your hair clean, search no further! Design Line's Olive Oil shampoo is also a great value! My husband and I will go through one of the big bottles about every three months...that's right...two people...one bottle...3 months! Give it a try!