GNC TOTAL LEAN L-CARNITINE: Each serving provides 1000mg of L-Carnitine. L-Carnitine is clinically shown to impact fatty acid metabolism and protect lean muscles. FAT METABOLISM: L-Carnitine helps facilitate the metabolism of long chain fatty acids to fuel muscle. MUSCLE RECOVERY: Fuel muscle and support recovery with L-Carnitine. BACKED BY SCIENCE: Since 1935, GNC has been committed to meeting the highest standards of quality, safety, and efficacy while applying the most up-to-date advances in nutritional science so you can live well.