L Carnitine Injections: A Clinical Guide for Practitioners National Medical Resources Inc L carnitine or what we call Skinny drip, is an amino acid naturally found in the body, which helps to convert fat into energy. Taking an injection of L carnitine once a week for 12 weeks can help LEVOCARNITINE INJECTION, USP1 g per 5 mL vial and 4 g per 20 mL vialFOR INTRAVENOUS USE ONLYRx Only L Carnitine Injections: A Clinical Guide for Practitioners National Medical Resources Inc LEVOCARNITINE INJECTION, USP1 g per 5 mL vial and 4 g per 20 mL vialFOR INTRAVENOUS USE ONLYRx Only