ive never had any kind of tests done on my liver values so i cant tell you personally. i can tell you that liv-52 is by far the cheapest, also the most researched. i have seen test results on another site showing that essentiale forte cut ones liver enzymes by 50%. and liver stabil is the newest formula, developed by the aas guru william llewellyn, and is suppose to be the most complete mix of ingredients of them all.