L Carnitine vs Pre Workout: Which Supplement Should You Take? L Carnitine is an amino acid that supports weight loss as it is a fat burning supplement. L Carnitine Push is a direct and quick IV infusion procedure that can be done on a weekly Amazon.com: ProSupps L Carnitine Liquid 3000, Stimulant Free Liquid Shots for Men & Women Clean Workout Drink for Energy, Performance & Muscle Recovery No Sugar, No Carbs 31 Servings, Green Apple : L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe