American Regent Introduces Levocarnitine Injection, USP; FDA Approved, "AP" Rated, and Therapeutically Equivalent to Carnitor L Carnitine is often marketed as a fat burner, but most people dont realize that oral and injectable L Carnitine are not the same..Oral L Carnitine has poor absorption (only 20% bioavailability), PDF) Comparison of 3 and 6 Month Outcomes of Combined Oral L Carnitine Fumarate and Acetyl L Carnitine Therapy, Included in an Antioxidant Formulation, in Patients with Idiopathic Infertility Injectable L Carnitine Dosage For Weight Loss Weight Wise Weight Loss Center