I can see now that we simply won’t come to much of a consensus on this.
I’m glad we can agree that deception is unacceptable.
You seem to be concerned with the economic consequences of regulating supplement makers. While I simply don’t care that holding them to standards of purity is expensive. People pay a lot of money for snake oil, and I’m feeling generous enough to allow for it to be sold as long as what’s in the bottle is what it says on the label, and not something else like strychnine or used engine coolant.
If I had my way anything used to treat medical conditions would be regarded as medicine and be held to medical standards of purity and effectiveness, which includes most dietary supplements.