L Carnitine Injection (Intramuscular): How It Works & What to Expect Mesotherapy Cocktails, Exosomes Regenerative Skin Boosters What is L Carnitine? L Carnitine is a naturally occurring amino acid derivative that the human body can synthesize itself. It is mainly found in red meat and dairy products. [1] Core Benefits of L Carnitine 600 mg mL (10 vials) Bulk Peptide Supply L Carnitine Injection vs. Oral Supplements: Which is More Effective? Katalyst Wellness