[hammock]

> most people would never know if you replaced their magnesium or calcium supplement with chalk.

Minerals and vitamins come from USP, which is tested and regulated and everyone in the industry gets the same quality (regardless of what they claim). It is what they say it is, if it’s USP.

Where is gets sketchy quickly is all the other stuff, like plant extracts etc

[nick__m]

USP is an old compendium, it is not an organization! it means United States Pharmacopeia, there is an organization that manages the trademark but they do not produce pharmaceutical, nor do they enforce quality, the enforcement is delegated to the FDA.