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Dietary SupplementFree FormL-Lysine is an essential free-form amino acid which acts as a precursor for other amino acids including L-carnitine (needed for fat metabolism). L-Lysine is crucial for the formation of collagen a major part of the body's connective tissues. L-Lysine also contributes to energy production when converted to acetyl coenzyme A one of the principal fuels for the Krebs cycle.