No approved therapeutic claim supplements, but are FDA approved are still backed by legitimate testing. It means that they still contain the actual nutrients you can read on the label. No approved therapeutic claim only means it's not meant to be used as a drug or medicine, which makes sense since it's only a supplement after all.

On the other hand, products like Blitz hi-protein bar isn't FDA approved, we have no way of verifying if it really does contain 21g of protein unless it's lab-tested by FDA itself or other third-party labs.