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 Cartinine not a magic fat burner , #gymlifestyle Targeting Skeletal Muscle Dysfunction With L Carnitine for the Treatment of Patients With Chronic Obstructive Pulmonary Disease In Vivo L Carnitine and Erectile Dysfunction: What the Evidence Shows L Carnitine 3000, Passionfruit Guava, 15.72 fl oz (465 ml)