I asked about it at the grow store I go to. The guy said its basically the same as other carb additives, but similar to botanicares flavored "sweet" line it has something in it that supposedly enhances the odor of lemony/fruity strains. I use cutting edge but I use bud candy,since it also has magnesium and B in it. I find it kind of irritating that even on the cutting edge website (which hasnt been updated since like 2007), they dont say anything about the sour dee, (or sugaree,or solor gaia or g-rex and t-rex). Its kind of sketchy..like they cant talk about half of their products.