There was one batch of QSC dnp that was claimed to be significantly underdosed around 1.5 years ago, based on my reading of forum posts then. I’m inclined to believe that was true. Like 1% of expected. Likely an untested raw was used, (though it appears Tracy now calls out beforehand if untested raws are being used in items currently for sale?).
The problem is that people start assuming other batches had that problem too, or think they had the same batch, and that’s when the real trouble starts.
Significantly underdosed dnp should be discarded just for safety reasons, so that one doesn’t confuse other non-underdosed dnp for the underdosed ones and blow past “safe” limits without realizing it.
Just as an aside, take it or leave it: when we post about problems with a sources products, it’s probably a good idea to post approximately when they were purchased from the source.
TTA