You are probably asking why you should get rid of your current shampoo? For starters, many shampoos have lots questionable ingredients that make us scratch our heads. If you can’t pronounce it, why would you scrub your face with it?
Most commercial shampoos strip the skin of its natural oils. The body, in its infinite wisdom, tries to balance itself back out by producing more oil. This all results in hair that gets really greasy really fast — a reason why most people feel like they need to wash their hair every day or two. Because they truly are greasier than they should be.
As with any new product, you are going to want to test this on a small section of your skin to determine if there will be any adverse reactions.