Frontiers Association between fatigue, peripheral serotonin, and L carnitine in hypothyroidism and in chronic fatigue syndrome Creatine vs L Carnitine: Which Supplement Fits Your Goals? Creatine Vs L Carnitine, Key Differences:, Creatine primarily aids in increasing muscle mass and strength when combined with other supplements like L carnitine., L carnitine seems more effective for L Carnitine vs Creatine Fat Loss or Muscle Gain? GreenOpia India GreenOpia Naturals Carnitine, Carnosine & Creatine OH MY! Dr Michael Greger of Nutritionfacts.org