And sometimes even after. Take for example, DMAA, a banned substance used in many workout supplements . It has contributed to at least five deaths and 86 reports of adverse effects . In 2013, the supplements Jack3d and OxyElite Pro were still sold in stores like GNC. It took a civil complaint for seizure from the . Attorney for western Pennsylvania to finally back down. Even then, GNC spokesman Greg Miller still said, "GNC believes that DMAA is a safe, legal dietary ingredient." A lot of supplements today still have DMAA or DMAA-like ingredients.