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 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 Inlife Berberine with Milk Thistle & Turmeric + Fat Burner with L Carnitine & Green Coffee Botanical Combo, Vegetarian Capsules Berberine HCL, 500 mg, 120 Quick Release Capsules Buy Bloom by Boldcare Berberine + L Carnitine Effervescent Tablets Complete Weight Management Online Acetyl L Carnitine, 500 mg, 60 Capsules