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Same goes for anything that says “proprietary blend” they do not have to tell you exactly what that is or how much. And if a non USP vitamin says it’s lab tested it’s likely their lab so they can sign off on whatever they want to. From the NIH...

@raykelley My father ended up with copper poisoning because of some of these supplements and vitamins he was buying that were recommended by his doctors ended up having excess copper because they weren’t third party tested. It’s a trade off for me, maybe some of the ingredients aren’t great but...

@raykelley Nature made is third party tested and USP verified, which very few vitamins are. USP tells you that what’s on the label is what’s in the vitamin. Do you have a link to the study that says they don’t contain what they say they do? https://www.quality-supplements.org/usp_verified_products