l carnitina mas cafeina 1500 + Cafeína Vitamin Way: Energía y Quema Grasa L-Carnitina Cafeína
Description
Acupunct Med 34(4):257266
L-theanine combined with L-carnitine is a different combination of energy and clarity

However, if you are an active athlete and want to support your body during training and recovery or contribute to weight loss, it is worth considering taking L-Carnitine as a supplement
Metab Brain Dis 25(4):381389