What supplements produce results?

There are an endless number of several different types of supplements you can take to build muscle/strength, lose bodyfat and improve performance. Some will produce noticable results and with others you will see and feel nothing. So, which ones work and which ones are a waste of money? METHOXY PRO, ZMASS PM, MET-RX MRP, EVOPRO, NITRO-TECH, CELL-TECH, LIPO 6 AND VITARGO CGL are all supplements that I have taken and seen good results with. What supplements do you think work and which ones do think are worthless? What supplements are you taking right now?