L Carnitine vs Fucoxanthin: Benefits, Combo & Side Effects Vinatura Supplements L Carnitine A Review of Benefits, Side Effects, and Dosage L Carnitine L Tartrate: 8 Key Benefits Dr. Lam L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe If you are like a lot of people, you may have never heard of carnitine but this important nutrient is critical for our body's ability to optimally burn fat required for energy.