Described herein is a method for reducing levels of the harmful metabolic waste product of S-adenosylmethionine (SAMe), homocysteine, and provide vitamin and other nutritional co-factors that reduce the production of homocysteine and either re-methylate homocysteine back to S-adenosylmethionine, or facilitate its conversion downstream to cystathione. The method of the invention may be achieved by administering 5-methyl tetrahydrofolate, methylcobalamin, and one or more compounds selected from the group consisting of betaine, pyridoxal-5-phosphate, N-acetyl-cysteine, and other cofactors.