Yes thats true, for the obvious reason ephedra is the core of the entire product. Try a search my friend, the top right hand corner, just type Xenadrine, there is a diary of a Xen user by Sophos in the workout journals forum that may also be of interest to ya.
I took Xen. (EFA verison) for a lil while (about 2 weeks) and I seriously controlled my diet. Eating small meals six times a day, I managed to lose around 1.5 inch around my waist. I lost around 1/8" or less around my arms.. they looked slightly more defined.. so im guessing I had v.little muscle loss.