Carnitine: the claims and why it may not work Amazon.com: Swanson Propionyl L Carnitine with Glycine Natural Supplement Promoting Heart Health & Energy Support May Support Muscle Strength & Endurance (60 Veggie Capsules) : Health & Household 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, (Energy & Fat Metabolism), , WHAT IT DOES, Transports fatty acids into mitochondria, Enables fat to be used for energy, , KEY BENEFITS, Fat Utilisation, Supports fat metabolism during