Which is better - CDP-Choline or Alpha-GPC? Every complete natural nootropic stack should contain some form of cholinergic compound; be it Centrophenoxine, choline bitartrate, DMAE, CDP-Choline or Alpha-GPC. While choline supplements alone do not make a nootropic stack, the absence of cholinergics is a serious flaw in any modern brain supplement. But which choline … [Read more...] about CDP-Choline or Alpha-GPC?