I received a sample of the Kiehl's Amino Acid Shampoo while purchasing one of their deodorants for my husband. I love testing samples of different shampoo brands, and I was definitely not disappointed by this one from Kiehl's. The company is a fairly old New York-based company, which has always prided themselves on using naturally-derived ingredients for both their skin- and hair care products. The Kiehl's Amino Acid Shampoo contains amino acids, which are the fundamental building blocks of the human body, coconut oil, and hydrolyzed wheat protein. These ingredients are what makes the Kiehl's Amino Acid Shampoo so deliciously rich and creamy. In addition, it is very mild, so it should be suitable for most people. I love it when products contain coconut, because, in addition to the softening effects, it also provides such a nice, mild scent to the product. If it were not for the price, I would most certainly consider purchasing the Kiehl's Amino Acid Shampoo in the future. But unfortunately, it is a bit over budget for me at the moment. Effectiveness The shampoo cleaned my hair perfectly fine. Scent The shampoo was not too perfumed, which I really like. I loved the mild coconut scent.