Acetyl L Carnitine vs L Carnitine: 4 Key Differences Momentous Acute L Carnitine Supplementation Does Not Improve CrossFit Performance: A Randomized, Double Blind, Placebo Controlled Crossover Study L Carnitine Injections: What You Should Know , L Carnitine is not a fat burner its a metabolic support tool., Its role is to help transport fatty acids into the mitochondria, where theyre Injectable carnitine in 2 minutes., What it is, How it works, Why some athletes use it, Most people focus on add ons before mastering the basics. Nutrition quality, total calories, training, and sleep