[RealityVoid]

I am willing to entertain the possibility that specific supplements don't work, but saying that all supplements don't work for all people _must_ be an exaggeration.

Obviously, some things work for at least a subset of people. I admit it is hard to distinguish real effects from placebo, but stuff like... creatine, which someone mentioned earlier do work.

[onlyrealcuzzo]

Supplements can "work" - but the quality of the supplement can be very low and filled with lots of bad stuff.

Since supplements aren't made like pharmaceuticals, this can be a pretty big problem.

[lambdaba]

Kind of scaremongering. Yes, quality varies, but if you really want to be diligent it's easy to find what the good brands are, that are getting tests, have certifications, etc.

Most of the vitamin supplements are cheap to make, there's really no reason for the manufacturer to risk it with adulterated product.

[nradov]

Any supplements that are NSF Certified for Sport are safe and highly unlikely to contain "bad stuff".

https://www.usada.org/spirit-of-sport/how-to-reduce-your-ris...

[bjtitus]

Nothing on this page sounds like a resounding endorsement:

> An athlete should never consider any dietary supplement to be 100% safe. No third-party testing company can test for every possible prohibited substance. The NSF Certified for Sport program reduces, but does not eliminate, risk for athletes. It is still up to each athlete to determine whether they want to take the risk of using dietary supplements and USADA does not approve or evaluate dietary supplement products.

It also seems focused on illegal substances, not the purity of the product.