Betaine (TMG), graded Strong-evidence on Magellan — 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. At 4 g/day or more it modestly raises total cholesterol, and NASH and body-composition trials were null.
Source: Eur J Nutr 2023, PMID 36717385 ↗ · Nutraceuticals & Cellular Energizers · How Magellan grades evidence · Study write-up · evidence confidence: high
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.
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.
Peer-reviewed studies on the active compound — citations link to PubMed.
“low-dose B vitamins plus betaine effectively decreased plasma homocysteine”
“Betaine supplementation caused a decrease in homocysteine concentration”
“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.”
“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.”
“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.”
“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.”
Research describes the active mechanism and is not a claim about this specific product.
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Yes — its active compound is linked to 23 peer-reviewed studies, summarized and cited above.
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