Unlock Peak Performance & Fertility with L Carnitine! Did you know that injectable L Carnitine is a game changer compared to oral supplements? While oral L Carnitine has low bioavailability (only ~14 18% Full article: Kinetics of carnitine concentration after switching from oral administration to intravenous injection in hemodialysis patients Compounded Carnitine (L) Injection Empower Pharmacy Injectable carnitine vs oral version comparison? 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),