list all the supplements to lose fat and gain muscle. increase testosterone and decrese cholesterol Ask Huberman Lab L Carnitine is a naturally occurring amino acid found mostly in meat and dairy products. It serves several functions in the body, primarily related to the production of cellular energy. L Carnitine L Tartrate ( Outwork Nutrition adds a citrusy Orange Sherbet flavor to Recovery Layne Time for your weekly dose of supplement education. Most people view carnitine as a fat burner but in all honesty the data on carnitine as a fat burner is beyond