Swanson's GPLC has an added ingredient that gives it a gross smell and upsets my stomach (I think it is calcium laurate). I have used many other brands that did not have this ingredient and smelled fine and didnt bother my stomach. I'm pretty sure it was added because GPLC is very hygroscopic (pulls water out of the air) and otherwise the caps get gummy inside, but I would prefer this to the stink and stomach turning effects. Other brands I can open the capsules and add them to my preworkout drink. These just make a disgusting, smelly, frothy mix that doesn't dissolve. And I'm 2 days outside of my return window, just my luck.