Compounded Carnitine (L) Injection Empower Pharmacy L Carnitine Is it Worth Taking? Ideal Nutrition What is L carnitine & What does it do to your body XXL L Carnitine doesnt magically burn fat, it helps your body use fat as energy. Combine it with training and consistency, and youll feel the difference @Marybosch shows us how L Carnitine will boost L carnitine is a naturally occurring amino acid structure that is made in the human brain, liver, and kidneys. L carnitine plays a critical role in energy production, as it converts fat into energy.