Feeling low on energy or hitting a plateau in your fitness goals? L Carnitine can help your body convert fat into fuel, supporting higher energy levels, improved endurance, and a faster metabolism. What Are L Carnitine Injections Used For? L carnitine is an amino acid derivative that plays a crucial role in the bodys energy production processes. As an injectable supplement, L carnitine has been employed to support various health L Carnitine Injectable: Boost Energy and Metabolism