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 Best Time to Take L Carnitine: A Complete Guide The Science of Good Health Amazon.com: Seeking Health Acetyl L Carnitine Acetyl L Carnitine Supplement Supports Energy, Healthy Fat Metabolism, & Memory Health 500 mg, 90 Capsules : Health & Household L Carnitine for PCOS: Everything You Need to Know PCOS Nutrition Center L Carnitine Linus Pauling Institute Oregon State University