L-Carnitine

Non-essential amino acid L-carnitine is commonly found in red meats and other foods derived from animals. Since it was initially extracted from meat in 1905, the word "carnitine" is derived from the Latin word "carnus," which means meat. You can give your body a natural supply of amino acids, including carnitine, by following a carnivore diet.

Athletes who take 1 to 2 grams daily before working out appear to benefit, according to some studies. Research on L-carnitine has concentrated on VO2 max, lactic acid support, and work output. L-carnitine is found in many food sources, but its concentration is low, so the most practical way to get it is through supplements.