Some 50 years ago, shampoo did not exist. That is, thousands of years humans have lived just fine without shampoo. In business, shampoo is a prime example of a non-existing market can be created. Shampoo is typically used to remove the unwanted build-up natural oils. These oils naturally produced to protect our hair. Washing out this protection may no be ideal. I have not washed my hair with shampoo for years and I’m totally fine. I am not alone on this – see Johnny Harris or Sam Bailey.