Subcutaneous Injection: What It Is and How to Give One L Carnitine in the Treatment of Psychiatric and Neurological Manifestations: A Systematic Review L Carnitine Injection (Intramuscular): How It Works & What to Expect Mesotherapy Cocktails, Exosomes Regenerative Skin Boosters L carnitine or what we call Skinny drip, is an amino acid naturally found in the body, which helps to convert fat into energy. Taking an injection of L carnitine once a week for 12 weeks can help L Carnitine Injection Levocarnitine IV