For my high-caffeine pre-workout powder, I suspect I'd vomit long before I'd get anywhere near. Pure caffeine is less unpleasant, but still pretty awful, which I guess is why we don't see more deaths from it despite the widespread use.
I agree with you that there really ought to be caution around giving advice on safety-critical things, but this one really is right up there in freak accident territory, in the intersection of somewhat dangerous substances sold in a poorly regulated form (e.g. there's little reason for these to be sold as bulk powders instead of pressed into pills other than making people feel more macho downing awful tasting drinks instead of taking pills).
