Why L-Carnitine? Mammoth L-Carnitine. A great tasting, caffeine-free and sugar-free workout supplement used to promote energy metabolism, muscle recovery & repair, and provide antioxidant support!. This product is clinically tested, vegetarian (non-animal sourced), caffeine free, sugar free and gluten free. L-Carnitine plays a role in increasing your body's metabolism. It achieves this by improving mitochondrial function (membrane-bound cell organelles (mitochondrion, singular) that generate most of the chemical energy needed to power the cell's biochemical reactions) and increasing cellular energy (energy from fat). L-Carnitine is an important amino acid, many sports athletes use it to help them burn fat, reduce muscle fatigue and speed up workout recovery. Supports fat metabolism and muscle recovery. Workout supplement that delays fatigue during physical activity. Antioxidant support - fight free radicals.