So this supplement was banned by the FDA to protect the commercial interests of pharmaceutical companies developing new drugs, literally. This is how America works regarding our diet and supplements, it has nothing to do with our health or best interest, nothing was dangerous about this supplement, it is actually really good for you and that's why it was banned.
Supplements are not supposed to have actual, measurable effects. If it turns out one does, then it was evidently misclassified in the first place.