When to take L carnitine Naprapathic Manual Medicine Program Acetyl L Carnitine Supplement (ALCAR) 500 mg Superior Labs 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 Carnitine 500mg 60 L Carnitine Capsules L Carnitine Supplement PCOS Nutrition Center L Carnitine (120 Capsules) PCOS Nutrition Center Liquid Gold: 5 Benefits of Liquid Carnitine You Can't Ignore NutraBio Brands