L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe Carnitine plays crucial role in energy production esp for the heart, fueling mitochondria (cell furnaces). Highest food source? Only animal food, especially red meat; lamb and beef are best. (Redder the L carnitine tartrate vs other forms of carnitine which is better Infinite Labs Source Naturals L Carnitine Capsules 250mg, 120 ct Smith's Food and Drug
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