not very many people can afford to do their own research... lab tests for everything you buy?
I think that the 3rd parties have both more at stake to get it right and are less influenced than the gov.
Underwriters Laboratories.
If it were feasible to sue retailers for damages due to fraudulent vitamins, approximately 0% of supplements sold would be fake.
The problem is there isn’t adequate scientific evidence to back the efficacy of any of these supplement which is why they aren’t regulated in the first place.
While I would agree that good evidence is generally lacking on supplements, that’s different than “is the product as advertised”. Just because vitamin C isn’t a miracle drug wouldn’t justify selling sugar pills as vitamin C.