Lets 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 role in fat Early research into L carnitine was often cited as underwhelming, showing negligible changes in muscle carnitine content and fat loss outcomes. However, these findings may have been limited by a short study window L Carnitine (as L Carnitine Tartrate) Thorne Vet L Carnitine ProSupps.com