Are you taking Ketotifen with the clen? I've used clen for many years and would always cramp up. I started another cycle of clen and immediately started cramping again so I added in Ketotifen after reading how it works well with clen and the cramping went away. You can also run the clen for an extended period of time without it losing it's effects if you also run it with the Ketotifen.
This is my first time using clen and ketotifen together. Anybody else notice this?
Taurine and potassium helps with the cramping if you're running the clen solo.