L Carnitine Injection vs. Oral Supplements: Which is More Effective? Katalyst Wellness Injectable vs Oral L Carnitine: Which Works Better? AWP Understanding the Difference Between L Carnitine and Acetyl L Carnitine Weight Wise Weight Loss Center What is L Carnitine, L Carnitine is an amino acid that plays a role in energy production and fat metabolism. Its found in foods like red meat, fish, and dairy, and also available as a supplement., L Carnitine Injectable Factor Health MD 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