I have no gallbladder so I ordered some thinking I needed to decongest my liver and I hated the Epsom. The GCG and Coptis gave me a major headache. It's made with a grain alcohol base and burns all the way day like whiskey would. I only used it for two days before a flush and I still got a ton of little bitey stones. The water looked like algae.
I'm with Mazie, since you seem to have no problems passing golf ball size stones I'd say you don't need it.