This is absolutely true because the supplement industry has no mandatory quality control like the FDA which doesn't exactly guarantee safety either but you get a minimum of what the product was supposed to do, the risk/benefits and at a minimum a guarantee that what you're buying has the exact chemical compounds advertised and the milligram dosage posted. On the other hand food supplements by their very nature can be anything so it's impossible to know or guarantee what you're getting, even from a "reputable" maker because the truth is most of the supplements are made in a handful of places and just labeled by the individual supplement company without any regulation to back the claim or legal protection for the consumer. Scam is right.