There always has been someone trying to make a quick buck off health since the second half of the 18th century. It also demonstrates that when people try to preserve or improve their health they search for the easy way out. We see that today with obesity and weight-loss claims. Sure we all ought to be eating fresh fruits and vegetables and be out exercising. But if you believe some of the claims being made you also can eat all-bran and get the same results while remaining a couch potato.
People look for the easy way out.
It is a basic human weakness.