An essential branched chain amino acid (BCAA) which must be provided from dietary sources. Necessary for muscle growth and repair it may also play a role in stimulating insulin secretion by the pancreas. Leucine is one of a group of amino acids preferentially secreted into sweat and sweat losses may be significant in exercising horses. Leucine supplements are used in combination with other amino acids to promote muscle growth, repair and recovery following exercise.

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