Trimethylglycine (TMG), also known as Betaine, is a naturally occurring compound found in various plants and animals. It is a derivative of the amino acid glycine with three methyl groups attached. TMG plays a crucial role in the body's methionine cycle, primarily by donating one of its methyl groups to homocysteine, converting it back to methionine.
Historically, TMG was first isolated from sugar beets (Beta vulgaris), hence its common name betaine. It is also found in significant amounts in other foods such as spinach, quinoa, seafood, and whole grains. In the human body, TMG acts as an osmolyte, helping to maintain cell volume and fluid balance, particularly in the kidneys.
Beyond its osmotic function, TMG's primary biochemical role is as a methyl donor. This function is vital for many physiological processes, including the synthesis of various compounds, detoxification pathways, and the regulation of gene expression. Its role in the methionine cycle is particularly important for homocysteine metabolism, a pathway linked to cardiovascular health (National Institutes of Health Office of Dietary Supplements). TMG is available as a dietary supplement and is also used medically in specific conditions.
Deep dive
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Known interactions
Category rule: glp1 × supplement
Note
GLP-1 medications slow stomach emptying, changing how/when oral supplements absorb; rapid weight loss raises the importance of protein and micronutrients.
Time oral supplements when nausea is lowest; prioritize protein and micronutrients; discuss with your provider.
Category rule: supplement × medication
Note
Some supplements change how the body processes medications (absorption, liver enzymes, or additive effects).
Specific pairs are checked against a licensed drug database and shown with their own severity. Always confirm with your provider or pharmacist.
Frequently asked
Sources referenced
- Cochrane Library
- DrugBank
- Examine.com
- FDA (U.S. Food and Drug Administration)
- Mayo Clinic
- MedlinePlus
- National Institutes of Health Office of Dietary Supplements (NIH ODS)
- PubChem
Stackwise compiles summaries from publicly available scientific and regulatory references. Always verify important decisions with a licensed clinician.
Related compounds
Others in the supplement category or studied for the same goals.
