The problem is trusting the labels represent what's in the supplement. These supplement companies either lie or aren't competent enough to ensure (1) what's in

The problem is trusting the labels represent what's in the supplement. These supplement companies either lie or aren't competent enough to ensure (1) what's in the product is what they claim (e.g. wildly different doses to what's claimed, either above or below), (2) there isn't contamination with heavy metals (e.g. arsenic). As a user I'd be more interested in knowing which products have independent verification of contents, so I know the product is what it claims to be, and that the product isn't going to poison me with arsenic etc.