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L-carnitine is a conditionally essential amino acid derivative synthesized primarily in the liver and kidneys from the essential amino acids lysine and methionine

How This Works L-Carnitine is a quaternary ammonium compound biosynthesized from lysine and methionine that plays a critical role in energy metabolism

The reaction is catalyzed by the carnitine acetyltransferase (CrAT, EC:2.3.1.7), which is present in many cell compartments, including the cytosol, the matrix or mitochondria and peroxisomes, as well as the endoplasmic reticulum and nucleus [5, 83, 106]

By enabling the cells to burn fat for fuel rather than relying exclusively on anaerobic glycolysis, L-carnitine helps prevent the rapid, toxic accumulation of lactic acid in skeletal muscle tissue

However, a good supply of L-carnitine is also helpful for intensive strength training units