Ephedrine
I am almost certain that both of these products contain the controversial stimulant, ma huang or ephedrine--- something that, according to my smart friend, Kimz, is illegal in Canada, undoubtedly for good reason. Before the raging popularity/controversy of these products, I tried a friend's Metabolife (also containing ephedrine) for a couple of days at best. Quite honestly, the stuff made me jittery, anxious, nauseated, unable to sleep. Did it curb my appetite or my famous craving for chocolate? Maybe a little. But as soon as I stopped taking the stuff, I was ravenous. (The body knows what it needs.)
My neighbor has been an ephedrine-product user for the last year or so. I think she has gained weight....and become a heck of a lot more "nervous" in the process.
You might want to look up ephedrine on the net prior to making any decisions.