Anecdotally, among my social group, almost everyone has heard of it, and no-one has ever experienced it.
Would you hold the same opinion about stuff you'd eat such as supplements? What does `indistinguishable` mean in this context? Say lower quality fish oil which as it's a pill, you can't tell the difference? This would be the fortunate case, I wouldn't even want to bring up mislabeled vitamins or stuff which can actually cause harm that's hard to trace back.