L Carnitine: Amino Acid Benefits REVIV L Carnitine: What it's used for, benefits and how to take it correctly Justloading Neither L Carnitine nor Berberine work like caffeine, yohimbine, or fat burners. They do NOT: Spike your heart rate Jack up your nervous system Cause jitters or crashes Mask L Carnitine Injection Clinica IDEAL Harwin Berberine vs L Carnitine , Which one should YOU take?, Both are metabolic powerhouses, but they work in completely different ways , Berberine HCL is natures metformin., 1. Activates AMPK (your cells L carnitine can boost your endurance But give it time