L Carnitine Benefits for Male Erectile Dysfunction What Is CoQ10 and L Carnitine, and How Can It Change Your Life? iThrive Essentials Did you know L carnitine, a vital amino acid, is naturally produced by your body and found in various foods? While acetyl L carnitine (ALCAR) can be a beneficial supplement for some, most people get Acute L Carnitine Supplementation Does Not Improve CrossFit Performance: A Randomized, Double Blind, Placebo Controlled Crossover Study