--- title: "Betaine (TMG) — Evidence, Benefits & Where to Buy | Magellan" description: "Betaine (TMG) — Betaine, also called trimethylglycine (TMG), is a naturally occurring compound found in foods such as wheat bran, spinach, beets, and…" url: "https://magellanlongevity.com/p/132.md" canonical: "https://magellanlongevity.com/p/132.html" html: "https://magellanlongevity.com/p/132.html" type: "product" section: "Nutraceuticals & Cellular Energizers" evidence_grade: "Strong evidence" evidence_tier: "strong" citations: 23 product_id: 132 price_usd: 17.14 updated: 2026-09-02 author: "Gabriel Radu, DO" author_credentials: "Physiatrist (PM&R). NY medical license 275110. NPI 1376861765." publisher: "Magellan Longevity" content_format: "markdown" license: "Educational content — not medical advice" --- # Betaine (TMG) [Home](https://magellanlongevity.com/) › [Nutraceuticals & Cellular Energizers](https://magellanlongevity.com/c/1.md) › Betaine (TMG) **HTML version:** https://magellanlongevity.com/p/132.html · **In the Magellan app:** https://magellanlongevity.com/#/product/132 ## Key facts | Field | Value | | --- | --- | | Product | Betaine (TMG) | | Category | [Nutraceuticals & Cellular Energizers](https://magellanlongevity.com/c/1.md) | | Evidence grade | Strong evidence (A) | | Peer-reviewed citations | 23 | | Typical listed price | $17.14 (check the live price) | | Where to buy | [Search Amazon](https://www.amazon.com/s?k=Betaine%20%28TMG%29&tag=magellanlong-20) | | Catalog ID | 132 | ## What it is Betaine, also called trimethylglycine (TMG), is a naturally occurring compound found in foods such as wheat bran, spinach, beets, and seafood, and it is also formed endogenously from choline. It has two principal physiological roles: as an organic osmolyte that protects cells from osmotic stress, and as a methyl donor in one-carbon metabolism. Through the enzyme betaine-homocysteine methyltransferase, betaine donates a methyl group to remethylate homocysteine to methionine, an alternative to the folate- and vitamin B12-dependent pathway. ## Its role in longevity Human trials and meta-analyses consistently show that oral betaine lowers fasting and post-methionine-load plasma homocysteine in a dose-dependent manner (about 1.2 µmol/L on average at 4 g/day and above), and a prescription form is FDA-approved for the rare genetic disorder homocystinuria; higher dietary intake has also been associated with lower cardiovascular mortality in a coronary-artery-disease cohort. However, doses at or above roughly 4 g/day modestly raise total cholesterol, homocysteine lowering has not itself been shown to reduce cardiovascular events, a 12-month trial in NASH was negative, and a meta-analysis found no body-composition benefit; some data even link betaine to higher risk when the gut-derived metabolite TMAO is high. Benefits appear confined mainly to people with elevated homocysteine or specific methylation defects. This evidence describes the betaine/trimethylglycine compound and its methylation mechanism, not this specific commercial product. ## Evidence grade: Strong evidence - **What the grade means:** Curated grade based on the human and mechanistic evidence for this compound. - **Dose used in studies:** 1.5–6 g/day in trials - **What this grade does not say:** Reliably lowers homocysteine (dose-dependent, meta-analyzed) and is FDA-approved for homocystinuria, but homocysteine reduction has never been shown to prevent cardiovascular events. At 4 g/day or more it modestly raises total cholesterol, and NASH and body-composition trials were null. ## Where it comes from without a bottle Food, exercise and behaviour routes to the same pathway, each with its citation. | Natural source | How it works | Citation | | --- | --- | --- | | Beets, spinach & wheat bran (true food betaine) | Betaine (trimethylglycine) is a real food compound, richest in beets, spinach, quinoa, and wheat bran/whole wheat. Everyday dietary intake is roughly 0.5-2 g/day, and even these food-level amounts measurably lower homocysteine; supplements just push the dose higher. | Current Drug Metabolism 2005 [PMID 15720203](https://pubmed.ncbi.nlm.nih.gov/15720203/) | | Choline-rich foods (eggs, liver) — betaine precursor | Your body also makes betaine from choline, so choline-dense foods (eggs, liver, soy) feed the same methyl-donor pathway. Food betaine and choline lower homocysteine about as much as folic acid, especially after a protein-heavy, methionine-rich meal. | Seminars in Vascular Medicine 2005 [PMID 16047264](https://pubmed.ncbi.nlm.nih.gov/16047264/) | ### What those papers actually say 1. **Beets, spinach & wheat bran (true food betaine)** Current Drug Metabolism 2005 · [PMID 15720203](https://pubmed.ncbi.nlm.nih.gov/15720203/) · [DOI 10.2174/1389200052997366](https://doi.org/10.2174/1389200052997366) > Studies in healthy volunteers show that betaine supplementation lowers plasma fasting homocysteine dose-dependently to up to 20% for a dose of 6 g/d of betaine. 2. **Choline-rich foods (eggs, liver) — betaine precursor** Seminars in Vascular Medicine 2005 · [PMID 16047264](https://pubmed.ncbi.nlm.nih.gov/16047264/) · [DOI 10.1055/s-2005-872397](https://doi.org/10.1055/s-2005-872397) > Betaine and choline can lower fasting tHcy concentrations to a similar extent as folic acid, particularly in the setting of a high intake of methionine. ## In the news - **Benefits, Side Effects, and Dosage of TMG Supplements** — Healthline 2024 [Read it](https://www.healthline.com/nutrition/tmg-supplement) > A 2021 review found that taking up to 4 grams (g) of TMG per day helped lower homocysteine levels without negatively impacting other aspects of heart health, like blood pressure and triglyceride levels. - **Betaine benefits, dosage, and side effects** — Examine.com 2022 [Read it](https://examine.com/supplements/betaine/) > Evidence in humans indicates that betaine effectively and reliably reduces homocysteine levels in both healthy people and people with various conditions. However, betaine also appears to increase total and LDL-cholesterol at high doses (> 4 g per day). - **In brief: B vitamins and homocysteine** — Harvard Health 2014 [Read it](https://www.health.harvard.edu/healthy-aging-and-longevity/In_brief_B_vitamins_and_homocysteine) > Lowering homocysteine doesn't mean much unless those reduced levels translate into reduced risk for the problems that elevated levels are thought to cause. Otherwise, you're just treating a blood test. - **Homocysteine: Function, Levels & Health Effects** — Cleveland Clinic 2025 [Read it](https://my.clevelandclinic.org/health/articles/21527-homocysteine) > A high level of homocysteine is harmful to the lining in your artery walls. It also may cause blockages in your blood vessels that lead to problems like a heart attack or stroke. ## The research Peer-reviewed studies on the active compound. Quotes are verbatim from the cited abstract. Research describes the active mechanism and is not a claim about this specific product. ### Cited studies 1. **Evidence: methyl donor, homocysteine remethylation** Eur J Nutr 2023 · [PMID 36717385](https://pubmed.ncbi.nlm.nih.gov/36717385/) · [DOI 10.1007/s00394-023-03087-y](https://doi.org/10.1007/s00394-023-03087-y) > low-dose B vitamins plus betaine effectively decreased plasma homocysteine 2. **Betaine supplementation modulates betaine concentration by MTHFR genotype in healthy active males** Nutr Res 2024 · [PMID 38876040](https://pubmed.ncbi.nlm.nih.gov/38876040/) · [DOI 10.1016/j.nutres.2024.05.003](https://doi.org/10.1016/j.nutres.2024.05.003) > Betaine supplementation caused a decrease in homocysteine concentration 3. **Effects of betaine supplementation on cardiovascular markers: A systematic review and Meta-analysis** Crit Rev Food Sci Nutr 2021 · [PMID 33764214](https://pubmed.ncbi.nlm.nih.gov/33764214/) · [DOI 10.1080/10408398.2021.1902938](https://doi.org/10.1080/10408398.2021.1902938) > In conclusion, the present systematic review and meta-analysis supports the advantage of a lower dose of betaine supplementation (<4 g/d) on homocysteine concentrations without the lipid-augmenting effect observed with a higher dosage. 4. **Orally administered betaine has an acute and dose-dependent effect on serum betaine and plasma homocysteine concentrations in healthy humans** J Nutr 2006 · [PMID 16365055](https://pubmed.ncbi.nlm.nih.gov/16365055/) · [DOI 10.1093/jn/136.1.34](https://doi.org/10.1093/jn/136.1.34) > a single dose of orally administered betaine had an acute and dose-dependent effect on serum betaine concentration and resulted in lowered plasma tHcy concentrations within 2 h in healthy subjects. 5. **A novel nutritional supplement to reduce plasma homocysteine in nonpregnant women: A randomised controlled trial in The Gambia** PLoS Med 2019 · [PMID 31408467](https://pubmed.ncbi.nlm.nih.gov/31408467/) · [DOI 10.1371/journal.pmed.1002870](https://doi.org/10.1371/journal.pmed.1002870) > At endline (our primary endpoint), the drink powder and UNIMMAP reduced mean plasma homocysteine by 23.6% (-29.5 to -17.1) and 15.5% (-21.2 to -9.4), respectively (both p < 0.001), compared with the controls. 6. **Betaine supplementation decreases plasma homocysteine concentrations but does not affect body weight, body composition, or resting energy expenditure in human subjects** Am J Clin Nutr 2002 · [PMID 12399266](https://pubmed.ncbi.nlm.nih.gov/12399266/) · [DOI 10.1093/ajcn/76.5.961](https://doi.org/10.1093/ajcn/76.5.961) > A hypoenergetic diet with betaine supplementation (6 g daily for 12 wk) decreased the plasma homocysteine concentration but did not affect body composition more than a hypoenergetic diet without betaine supplementation did. 7. **Long-term effect of betaine on risk factors associated with the metabolic syndrome in healthy subjects** Eur J Clin Nutr 2010 · [PMID 20978525](https://pubmed.ncbi.nlm.nih.gov/20978525/) · [DOI 10.1038/ejcn.2010.230](https://doi.org/10.1038/ejcn.2010.230) > Betaine had no effect on serum lipid profile in long term in young healthy subjects. The lowering effect on plasma homocysteine concentration was weak. 8. **Dietary and supplementary betaine: acute effects on plasma betaine and homocysteine concentrations under standard and postmethionine load conditions in healthy male subjects** Am J Clin Nutr 2008 · [PMID 18326594](https://pubmed.ncbi.nlm.nih.gov/18326594/) · [DOI 10.1093/ajcn/87.3.577](https://doi.org/10.1093/ajcn/87.3.577) > Dietary betaine and supplementary betaine acutely increase plasma betaine, and they and choline attenuate the postmethionine load rise in homocysteine concentrations. 9. **Dietary and supplementary betaine: effects on betaine and homocysteine concentrations in males** Nutr Metab Cardiovasc Dis 2009 · [PMID 19346114](https://pubmed.ncbi.nlm.nih.gov/19346114/) · [DOI 10.1016/j.numecd.2009.01.004](https://doi.org/10.1016/j.numecd.2009.01.004) > Supplemental or dietary betaine similarly increase circulating betaine concentrations and attenuate the post-methionine load rise in homocysteine concentrations. 10. **Betaine concentration as a determinant of fasting total homocysteine concentrations and the effect of folic acid supplementation on betaine concentrations** Am J Clin Nutr 2005 · [PMID 15941890](https://pubmed.ncbi.nlm.nih.gov/15941890/) · [DOI 10.1093/ajcn/81.6.1378](https://doi.org/10.1093/ajcn/81.6.1378) > Concentrations of tHcy were inversely related to the betaine concentration (r = -0.17, P < 0.01), and the association was independent of age, sex, and serum concentrations of folate, creatinine, and cobalamin. 11. **The association of betaine, homocysteine and related metabolites with cognitive function in Dutch elderly people** Br J Nutr 2007 · [PMID 17537289](https://pubmed.ncbi.nlm.nih.gov/17537289/) · [DOI 10.1017/S0007114507750912](https://doi.org/10.1017/S0007114507750912) > betaine was positively associated with better performance of construction, sensomotor speed and executive function, whereas elevated concentrations of methionine were positively associated with sensomotor speed. 12. **Effects of betaine intake on plasma homocysteine concentrations and consequences for health** Curr Drug Metab 2005 · [PMID 15720203](https://pubmed.ncbi.nlm.nih.gov/15720203/) · [DOI 10.2174/1389200052997366](https://doi.org/10.2174/1389200052997366) > Studies in healthy volunteers with plasma homocysteine concentrations in the normal range show that betaine supplementation lowers plasma fasting homocysteine dose-dependently to up to 20% for a dose of 6 g/d of betaine. 13. **Betaine in human nutrition** Am J Clin Nutr 2004 · [PMID 15321791](https://pubmed.ncbi.nlm.nih.gov/15321791/) · [DOI 10.1093/ajcn/80.3.539](https://doi.org/10.1093/ajcn/80.3.539) > As a methyl donor, betaine participates in the methionine cycle-primarily in the human liver and kidneys. 14. **Homocysteine metabolism** Annu Rev Nutr 1999 · [PMID 10448523](https://pubmed.ncbi.nlm.nih.gov/10448523/) · [DOI 10.1146/annurev.nutr.19.1.217](https://doi.org/10.1146/annurev.nutr.19.1.217) > Homocysteine is a sulfur amino acid whose metabolism stands at the intersection of two pathways: remethylation to methionine, which requires folate and vitamin B12 (or betaine in an alternative reaction); and transsulfuration to cystathionine, which requires pyridoxal-5'-phosphate. 15. **Preventive and therapeutic role of betaine in liver disease: A review on molecular mechanisms** Eur J Pharmacol 2021 · [PMID 34743980](https://pubmed.ncbi.nlm.nih.gov/34743980/) · [DOI 10.1016/j.ejphar.2021.174604](https://doi.org/10.1016/j.ejphar.2021.174604) > In recent years, a large number of literatures have shown that betaine has good preventive and therapeutic effects on many liver diseases, including chemical or drug-induced liver injury, nonalcoholic fatty liver disease, alcoholic fatty liver disease, liver fibrosis, hepatitis B and hepatitis C. 16. **One-Carbon Metabolism in Fatty Liver Disease and Fibrosis: One-Carbon to Rule Them All** J Nutr 2020 · [PMID 32119738](https://pubmed.ncbi.nlm.nih.gov/32119738/) · [DOI 10.1093/jn/nxaa032](https://doi.org/10.1093/jn/nxaa032) > Many animal models have demonstrated that one-carbon metabolism is strongly associated with NAFLD. 17. **Dietary betaine intake and risk of mortality in patients with coronary artery disease: the prospective Guangdong Coronary Artery Disease Cohort** Br J Nutr 2022 · [PMID 36348572](https://pubmed.ncbi.nlm.nih.gov/36348572/) · [DOI 10.1017/S0007114522002975](https://doi.org/10.1017/S0007114522002975) > Higher dietary betaine intake was associated with a decreased risk of cardiovascular death after fully adjustment for cardiovascular risk factors, other potential confounders and plasma methionine metabolites and vitamins. 18. **Prognostic value of choline and betaine depends on intestinal microbiota-generated metabolite trimethylamine-N-oxide** Eur Heart J 2014 · [PMID 24497336](https://pubmed.ncbi.nlm.nih.gov/24497336/) · [DOI 10.1093/eurheartj/ehu002](https://doi.org/10.1093/eurheartj/ehu002) > Elevated plasma levels of choline and betaine are each associated with incident MACE risk independent of traditional risk factors. However, high choline and betaine levels are only associated with higher risk of future MACE with concomitant increase in TMAO. 19. **Betaine supplementation decreases plasma homocysteine in healthy adult participants: a meta-analysis.** Journal of chiropractic medicine 2013 · [PMID 23997720](https://pubmed.ncbi.nlm.nih.gov/23997720/) > Across 5 RCTs at 4 g/day or more, betaine lowered plasma homocysteine by a pooled 1.23 µmol/L versus placebo. 20. **Betaine for nonalcoholic fatty liver disease: results of a randomized placebo-controlled trial.** Hepatology (Baltimore, Md.) 2009 · [PMID 19824078](https://pubmed.ncbi.nlm.nih.gov/19824078/) > In 55 biopsy-proven NASH patients, 20 g/day for 12 months did not improve steatosis, disease activity, or fibrosis versus placebo — a well-conducted negative trial. 21. **Betaine Supplementation Moderately Increases Total Cholesterol Levels: A Systematic Review and Meta-Analysis.** Journal of dietary supplements 2021 · [PMID 31809615](https://pubmed.ncbi.nlm.nih.gov/31809615/) > Meta-analysis of 6 RCTs found betaine at 4 g/day or more modestly raises total cholesterol (+0.34 mmol/L pooled), with LDL, HDL, and triglycerides unchanged. 22. **Betaine supplementation fails to improve body composition: a systematic review and meta-analysis.** The British journal of nutrition 2022 · [PMID 34743773](https://pubmed.ncbi.nlm.nih.gov/34743773/) > Systematic review and meta-analysis found no effect of betaine on body weight, BMI, fat mass, or fat-free mass — an honest null for a popular claim. 23. **Decoding Betaine: A Critical Analysis of Therapeutic Potential Compared with Marketing Hype-A Narrative Review.** The Journal of nutrition 2024 · [PMID 39270852](https://pubmed.ncbi.nlm.nih.gov/39270852/) > A critical review contrasts betaine's genuine methyl-donor biochemistry with overstated supplement marketing claims. ## Where to buy [Search Amazon for Betaine (TMG)](https://www.amazon.com/s?k=Betaine%20%28TMG%29&tag=magellanlong-20) — affiliate search link. ## Structured data ```json {"@context":"https://schema.org","@graph":[{"@type":"ItemPage","@id":"https://magellanlongevity.com/p/132.html#page","url":"https://magellanlongevity.com/p/132.html","name":"Betaine (TMG)","description":"Betaine, also called trimethylglycine (TMG), is a naturally occurring compound found in foods such as wheat bran, spinach, beets, and seafood, and it is…","inLanguage":"en","isPartOf":{"@type":"WebSite","name":"Magellan Longevity","url":"https://magellanlongevity.com/"},"author":{"@type":"Person","name":"Gabriel Radu, DO","jobTitle":"Physiatrist (PM&R)","identifier":[{"@type":"PropertyValue","name":"NPI","value":"1376861765"},{"@type":"PropertyValue","name":"NY medical license","value":"275110"}]},"publisher":{"@type":"Organization","name":"Magellan Longevity","url":"https://magellanlongevity.com/"},"encoding":{"@type":"MediaObject","encodingFormat":"text/markdown","contentUrl":"https://magellanlongevity.com/p/132.md"},"dateModified":"2026-09-02"},{"@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://magellanlongevity.com/"},{"@type":"ListItem","position":2,"name":"Nutraceuticals & Cellular Energizers","item":"https://magellanlongevity.com/c/1.html"},{"@type":"ListItem","position":3,"name":"Betaine (TMG)","item":"https://magellanlongevity.com/p/132.html"}]},{"@type":"Product","@id":"https://magellanlongevity.com/p/132.html#product","name":"Betaine (TMG)","category":"Nutraceuticals & Cellular Energizers","url":"https://magellanlongevity.com/p/132.html","description":"Betaine, also called trimethylglycine (TMG), is a naturally occurring compound found in foods such as wheat bran, spinach, beets, and seafood, and it is also formed endogenously from choline. 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Nothing here is intended to diagnose, treat, cure, or prevent any disease. Talk to your physician before starting any supplement or device, especially if you are pregnant, nursing, or taking medication. Editorial firewall: evidence grades are assigned from the published research and are independent of any affiliate commission. As an Amazon Associate, Magellan Longevity earns from qualifying purchases. Reviewed for accuracy by a board-certified physician (DO).