R+ Lipoic Acid is the natural chemical that is found in your muscle cells. The scammers that are selling the potassium version have no idea if it will even be used by the muscle cells given the way they have changed it's structure. You can't take a natural chemical and change it and expect the body will then accept it like it would the natural. It's a gimmick they have never even tested.
Trust me, if we could NOT give everyone free shipping upgrades every summer simply by making a potassium version, we'd do it. This is just another supp company trying to sell a product when they don't even know if it works or not.