This shampoo and conditioner combination is called 2-in-1 Shampoo. You can save time and money by using 2-in-1 shampoo. 2-in-1 shampoo can be less effective than conditioner because shampoo serves the opposite function. Although it's possible to have both shampoo and conditioner simultaneously, technological advances have made it possible. But your results could vary. The 2-in-1 conditioner has always been used in place of shampoo. Recently, however, the conditioner has been more popular than shampoo. These products, also known as cowash, have slight differences and are discussed further below.