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 Acetyl L carnitine (ALCAR) improves mood, learning, and memory by aiding in the process that delivers energy to your cells. ALCAR also helps muscle mitochondria burn fat, which can increase your Yohimbine HCL vs. Essential Burner: Deciphering the Fat Burning Choice Welcome to Day 123 of my Competition Preparation Journey, Note : L Carnitine mostly helps those with low levels (like vegans or vegetarians ). Also Yohimbine does have evidence for fat loss, Acetyl L Carnitine Gummies Herbamama Yohimbine HCL, 90 Capsules POLE & DENNIS JAMES