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Vitamin B12 deficiency will decrease methionine synthase activity, which will result in elevated homocysteine and the risk of DVT increases as a result.  In this article, the cause of the vitamin B12 depletion was metformin.  Diabetics and those with insulin resistance are already at an increased risk of blood clots.

Vitamin B12, methyl cobalamin, is very important in lowering homocysteine levels through methionine synthase.  The VISP trial did not show efficacy in the intention to treat analysis.  However, analysis of the efficacy reveals that many clients had too low of vitamin B12 levels due to malabsorption and vitamin B12 levels should have been higher in the VISP intention to treat.

SAMe shown to lower liver toxicity in chemotherapy treatment.  SAMe could be a powerful chemotherapeutic adjuvant.  This makes since, because cancer is known to be a hypomethylated state.  Low methyl donors will reduce CBS activity and thus lower glutathione.  This will result in increased oxidative stress and inflammation in the liver.  SAMe will open the CBS activity up and increase glutathione production.

great read on role of disordered methylation in Autism