I don't think its a miracle fat burner by any means. Its a good compound to be used in conjunction with other supps for the maximum benefit. Did you know it also is known to significantly increase sperm motility? so if you have bad swimmers, be aware they're joining the varsity when you're on alcar-
for fat burning, I prefer r-ala or even a phospholipid. My rationale: I've never heard of anyone getting sick from taking too much alcar. But, taking too much r-ala (pure r-ala and not the blend) will actually be quite bad. You get sleepy, nauseas, and I've never taken it to this point, but I think you're body would forcibly expel the overdose if you took way too much...
...just my opinion on this. oh, and btw, there's another carnitine which causes heart problems. Its not l-carnitine, but a different one, so be aware there's a few out there and they're not all good.