Levocarnitine Injection USP 1 g per 5 mL vial For Intravenous Use Only. L Carnitine 500 mg Supplement with Multiple Benefits Carnitine vs Acetyl Carnitine: What Quality Differences Do They Have? Allmax L Carnitine+Tartrate 120 Capsules 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 Acetyl L Carnitine Powder Green Labs Nutrition