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Adequate protein supports the muscle preservation effects of the compound and provides substrate for maintaining lean tissue

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Subsequent biochemical work demonstrated that only two enzyme systems require forms of vitamin B12 in man: adenosylcobalamin in the conversion of methylmalonyl coenzyme A to succinyl coenzyme A by methylmalonyl-coenzyme A mutase, and methylcobalamin in the conversion of homocysteine to methionine by methionine synthase (139)