I make my own. Organic dried black elderberries and vodka (30 days, darkness, shaken every third day & then strained). And, instead of the cheap vodka that I bought to make it, I ended up using good stuff so it's actually kind of smooth. Throw some sugar in there and it might actually taste pretty good (I didn't, but I could see how it would improve it)!

I did notice the diuretic effect at first, but I think my body has adjusted to it. Is that even possible? I've had no stomach issues at all and I usually take mine first thing in the morning on an empty stomach. I follow it up with coffee to kill the taste in my throat, too.