pieter, let me start with you. what did your study find?what we found was that yet another still lappet has appeared in supplement. we've seen a plethora of things trying to replace ephedra since banned in 2004 and we found a new stimulant extremely similar to amphetamine. >> sreenivasan: daniel, when at the fda you did your own study. why is it still on the shelves and not pulled then? >> the study was initiated at the end of 2013. the types of studies evidentiary burden, there has to be due process so it was a scientific study not necessarily done for regulatory purposes but started during my time and in all fairness should have continued the work and the fda should have the authority to take the product off the market. >> sreenivasan: they don't have the authority now? >> they do. >> sreenivasan: the fda said "it is true under current law the agency faces a high burden before we can take enforcement action on a dietary supplement. that said we recognize more can and should be done. we're committed to leveraging limited resources to addre