If there is a product that is truly new, federal law requires that it be on prescription.
One of the best ways to make big bundles of money is to claim that you have a new diet product. People rush out and buy lots of it. When it doesn't work nobody ever sues the manufacturer let alone even complains that it didn't work. They just place the blame on themselves. Then they rush out to buy the next newest, greatest thing.
The only thing that gets slimmer is the person's billfold.