Injectable vs Oral L Carnitine: Which Works Better? AWP Benefits of L carnitine injections are aplenty! This injection is a great way to boost your energy levels, help with weight management, and even promote healthy heart function. Studies show that L Carnitine Injections for Weight Loss Prescription Weight Loss, Inc. Specialty Infusions and Injections Driftless Hydration L Carnitine Body Contouring Institute BCN Mesotherapy Serum Dermishop L Carnitine 500mg mL 30mL Vial F40 Biotech Injectables Peptide Source Canada