When I last went to a mall in Vegas, a fetching woman in the lobby offered to sell me a facial skin care product “made out of diamonds” with free samples for a bargain price. I presume types of sand, pencils and charcoal can be kind of made out of diamonds too.
So any product that purports to eliminate wrinkles with visible differences(!) and chemicals holding a bazillion times their weight in water probably are fairly temporary.
But there are other industries which sell more sizzle than steak? Which are the most egregious?