Injectable l carnitine has 100% bioavailability and it's a supplement, not steroid. Even as a natty you can use and it can also help you in your bulking process, not just in fat L Carnitine Injection (Intramuscular): How It Works & What to Expect Mesotherapy Cocktails, Exosomes Regenerative Skin Boosters Carnitine octanoyltransferase is important for the assimilation of exogenous acetyl L carnitine into acetyl CoA in mammalian cells Journal of Biological Chemistry Carnitine and Acylcarnitine Analysis Service LCMS MS Quantification Creative Proteomics