Let's cut through the marketing noise and look at the actual science of fat loss. A lot of supplements make big claims, but L Carnitine is heavily backed by research for its Effectiveness varies: L carnitine may help with fat metabolism, but it's not a magic weight loss pilldiet and exercise still matter most. Forms matter: Regular L carnitine general use Acetyl L carnitine brain & energy L Carnitine 3000 NutraKey Weight Loss Support L Carnitine for Fat Burning: Boost Energy & Lose Weight Naturally Malook L Carnitine as Pre Workout Supplement: Guide The Science of Good Health iSatori L Carnitine LS3 3000, Liquid L Carnitine with Acetyl L Carnitine, L Carnitine L Tartrate, Stimulant Free Pre Workout : Target