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Papers referenced in the video:
Serum total homocysteine concentrations in adolescent and adult Americans: results from the third National Health and Nutrition Examination Survey
https://pubmed.ncbi.nlm.nih.gov/10075334/

Association between Homocysteine Levels and All-cause Mortality: A Dose-Response Meta-Analysis of Prospective Studies
https://pubmed.ncbi.nlm.nih.gov/28684797/

Hyperhomocysteinemia as a Risk Factor and Potential Nutraceutical Target for Certain Pathologies
https://pubmed.ncbi.nlm.nih.gov/31069230/

Glycine Metabolism and Its Alterations in Obesity and Metabolic Diseases
https://pubmed.ncbi.nlm.nih.gov/31208147/

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Link to an earlier experiment for betaine (TMG) on homocysteine:
Reducing Homocysteine? Updates.
https://michaellustgarten.com/2018/03/23/reducing-homocysteine-updates/