How to Self Administer Subcutaneous & Intramuscular Injections Injectable vs Oral L Carnitine: Which Works Better? AWP 6 Benefits of L Carnitine Injections MedHealth 360 L Carnitine Injection Levocarnitine IV L CARNITINE INJECTION Injectable L carnitine works better than oral because it goes straight into your bloodstream, giving almost 100% of absorption versus only 518% with capsules or liquid. , Oral L carnitine can take