Peter Attia· MD
if you have any length of hair you should always follow your shampoo with a conditioner shampoo is like a degreaser meaning essentially it's cleanser and if you shampoo in a harsh way or with a strong surfactant let's call it then you're gonna strip out a lot of the natural oils of the scalp and also of the hair in a conditioner replaces those natural moisturization of the hair so it's kind of important to do both of those things