I agree, the fat loss proponent is overrated...
Carnitine promotes the transport of long-chain fatty acids into the cells where they are being oxidized. So the theory is that supplementation with L-carnitine may enhance fat mobilization... Problem is that recent studies have yielded disappointing results with regard to outcomes of supplementation on fat loss.
I d say, there are better fat burners out. If it is part of a fat burning complex, I would not mind taking it, but I would not spend a lot of $$ on it.