Some people are dumb. They also pay extra to buy shampoo with vitamins in it despite most of them knowing it does nothing. They just want an excuse to buy the

Some people are dumb. They also pay extra to buy shampoo with vitamins in it despite most of them knowing it does nothing. They just want an excuse to buy the more complex version of a banal product to exert some control over their banal lives. In this case, the FDA can exert some back-pressure because of the significant risk to developing resistant bacteria against the soap constituents, which are needed in medical settings, so they are. Unfortunately there isn't anything to do be done about rinsing vitamins down the shower drain. Not yet anyway.