Most fat burners on the market are nothing more then caffeine pills with a mere sprinkling of other ingredients.
However, there are 2 really good supplements that will greatly increase fat loss.
1. Cardarine gw. It's a ppar regulator and will directly increase fat loss and glucose uptake by skeletal muscle cells. What is Cardarine? The truth Exposed - Evolutionary.org
2. N2slin from n2bm.com
N2slin is a stimulant free fat burner and strong nutrient partitioner. It increases the insulin sensitivity of your muscle cells and helps partition the food you eat into muscle cells and away from fat cells.
Those are the 2 supplements I use and recommend for fat loss.