@erik_squires I’m pretty certain you know the answer is that nobody knows anything claimed about any product unless they can verify it themselves somehow. You are operating on pure trust otherwise. So be sure as always to do your homework and know who you are dealing with.
Personally, if I am paying a premium for something advertised I expect at least evidence and preferably proof. Esoteric and often expensive hifi tweaks are merely one very good example. High quality cosmetics is another that is very common. Always check the ingredients at minimum else all bets are off. Verification if tested somewhere is even better.
Companies marketing products often bank on the fact that consumers will take any claims made at face value and expect no proof or evidence. This is the norm. One can choose to be a smart consumer and maybe trust but verify but frankly most are not able to and don’t.
”A fool and his (or her) money……” always holds true.