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 Mega Carni X Scitec Sport Nutrition Marathontime L Carnitine Liquid 500 ml Eper z, zsrgets L Carnitine 3500 Metabolic Nutrition L Carnitine 6000 Liquid 1000 ml Extra High Dose Martinique Ubuy Maxler L Carnitine 3000 Cherry 14 x 25 ml High Dose L Carnitine Liquid Vegan Food Supplement 3000 mg Active Potff per Serving 14 Servings : Amazon.de: Health & Personal Care