Baby shampoo can be used on adult hair, although it is gentler than most adult shampoos. In particular, for those who use a lot of different hair products, baby shampoo may not be strong enough to cleanse the hair properly.
Johnson's Baby Shampoo is gentler because it has fewer irritants and is typically less expensive than other shampoos. However, because of the way it is formulated, adults may need to wash their multiple times to get truly clean hair while using the product. It has light smell, and is often more moisturizing than regular adult shampoos, which leaves the scalp less dry.