Carnitine: the claims and why it may not work L Carnitine 1000 Help Boost Fat Burning, Endurance & Muscle Recovery L Carnitine is not a magic fat burner It won't melt fat, build muscle, or replace hard work. The only thing it burns is your money Stick to the basics Lets talk about L Carnitine, If youre in the gym community, youve probably heard of L Carnitine but what actually is it?, L Carnitine is a naturally occurring compound that plays a role in helping Should I use L Carnitine on rest days or just before workouts?