Medical practitioners don't prescribe melatonin because you don't need a prescription for it. We don't get paid for any prescriptions we do write however, so your reasoning is incorrect. I could write prescriptions for any given drug all day long and no one is coming to reward me with anything. And Katie above is correct that it is a hormone we naturally produce and not an herbal product. I do recommend melatonin for sleep and I use it for my children.