Amazon.com: Doctors Best Acetyl L Carnitine 1000 mg Per Serving Acetyl L Carnitine Supplement for Men & Women, Supports Brain & Nerve Cell Function, Mental Focus, Helps Generate Cellular Energy 60 Veg L Carnitine injection is recommended at 1 ampule every 2 3 days for best results. The L Carnitine is taken intravenously either by normal injection or using a butterfly needle. After taking this L Carnitine, you L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe Amazon.com: Muscle Pharm L Carnitine 3000, The Ultimate Liquid L Carnitine Supplement for High Performance, Supports Metabolism, Hydration & Energy, Zero Sugar, Low Calories, Peach Nectarine Flavor, 32 Servings : Everything Else