Funny, I never thought of cultured, store-bought yeast as an "additive." I always considered additives to be things like sulfites, artificial sweeteners, sorbate, etc... I've tried fermenting without sulfites once, just to be as natural as possible (less the wild yeast of course) and had a terrible time of it. The must developed "flowers of wine" & I ended up having to buy a filter to save the must. I know others have gone the 100% organic/natural/wild route & had great success, but I think I'll stick to store-bought yeast & sulfites. Regards, GF.