Weight loss?

Hey, I am 6'2" and weigh 260lbs. I've been lifting for about 6 months. So based on this, everyone tells me I shouldn't do AS like clen or cytomel yet, so I'm not gonna take em. A lot of people seem to favor Xenadrine for weight loss. So I'm gonna give that a whirl. Does anyone know if Stacker 2 is any good? I take that occasionally for a boost of energy. On the label, it boasts "Worlds strongest fat burner" but I dont see a reason to believe that, although it does supress my appetite. It has 25mg of ephedrine alkaloids and 200mg of caffiene alkaloids, white willow bark and chromium picolinate. Anyone know anything about these ingredients (the willow bark and chromium picolinate)? Also, what are alkaloids? Any recomendations or info would be helpful. Thanks.