TMG (Betaine) Lowers Homocysteine 32%, Liver Fat 18% in 12-Week RCT
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TMG (Betaine) Lowers Homocysteine 32%, Liver Fat 18% in 12-Week RCT

By Sophie · · Hepatology 2025
KO | EN

TMG (trimethylglycine, betaine) 3g/day for 12 weeks improved homocysteine and NAFLD markers in 110 patients, according to 2025 data in Hepatology. A natural methyl donor that backs up the methionine cycle for SAM-e regeneration.

The trial enrolled 110 patients with NAFLD plus elevated homocysteine (>15μmol/L) across 12 weeks. Results: homocysteine -32% (mean 18.7 → 12.7μmol/L), ALT -22%, AST -18%, liver fat content (MRI-PDFF) -18%, NAFLD score -27%, HOMA-IR insulin resistance -15%. Adverse events: mild GI discomfort (8%), some fishy body odor.

What is TMG

TMG (trimethylglycine, also called betaine) is glycine with three methyl groups attached. Dietary sources: beetroot, spinach, quinoa, whole wheat, shrimp. The body donates a methyl group from TMG to homocysteine → methionine regeneration → SAM-e (S-adenosyl-methionine, the universal methyl donor).

Available forms:

  • TMG powder: 1~6g/day divided (most cost-effective)
  • TMG capsules 500mg, 1g
  • Beet extract (nitrate + TMG matrix)
  • Standalone or matrix with B-complex (B6, B12, methylfolate)

Multi-target mechanisms

1. Methionine cycle — homocysteine → methionine regeneration:

  • Cycle: methionine → SAM-e → SAH → homocysteine → methionine (regenerated)
  • Two paths from homocysteine → methionine:
    • Folate·B12 path: MTR (methionine synthase), uses methylfolate methyl
    • Betaine (TMG) path: BHMT (betaine-homocysteine methyltransferase), uses TMG methyl
  • BHMT path serves as backup when B12·folate are deficient
  • Elevated homocysteine → cardiovascular, cognitive, osteoporosis risk markers

2. SAM-e regeneration — universal methyl donor:

  • SAM-e methylates DNA, RNA, proteins, neurotransmitters, phospholipids
  • Methylation governs gene expression, aging clocks, mood, neuroprotection
  • TMG fuels SAM-e regeneration

3. Liver fat metabolism — NAFLD target:

  • Methionine deficiency → low PEMT enzyme → low phosphatidylcholine → low VLDL secretion → liver fat accumulation
  • TMG preserves methionine·choline → PEMT activity restored → liver fat exported
  • NAFLD/MASH (current term) adjunct

4. Exercise performance:

  • Some trials: TMG 2.5g/day 6 weeks anaerobic performance +5~7% (repeat sprints, power)
  • Mechanism: cellular hydration, osmotic stability, contraction efficiency
  • ISSN position statement lists TMG as performance-supportive

5. Topical hydration:

  • Betaine is a natural moisturizing factor (NMF)
  • Standard cosmetic humectant

Clinical data

  • Hepatology 2025 RCT 110 patients 12 weeks: homocysteine -32%, liver fat -18%
  • 2024 trial: MTHFR variant women 12 weeks TMG 3g/day, homocysteine -45%
  • 2023 trial: athletes 6 weeks TMG 2.5g/day, repeat sprints +6%
  • 2022 trial: NAFLD 12 weeks TMG + choline + methionine matrix, ALT -32%

Cautions

  • MTHFR C677T variant: TMG effect amplified (folate path bypass). Physician assessment recommended
  • Kidney disease: monitor homocysteine, physician assessment
  • High dose (>6g/day): fishy body odor, some GI discomfort
  • Pregnancy·lactation: limited data, physician assessment (homocysteine monitoring may be valuable)
  • Methylation sensitivity: some experience anxiety, palpitations from strong methyl donation. Magnesium·niacin support or dose reduction
  • Divided dosing: 3g/day = 1g × 3 with meals
  • Adequate hydration: osmotically active molecule
  • Reassess at 3 months: re-test homocysteine, liver enzymes

Synergy matrix

  • TMG + Methylfolate + Methyl-B12 + B6: methylation matrix (homocysteine target)
  • TMG + Choline + Inositol: NAFLD matrix
  • TMG + Creatine: performance matrix
  • TMG + DIM + CDG: hormone + methylation integration

Consumer message

For homocysteine, liver fat, and methylation, dietary methionine alone falls short. TMG, derived from beets and spinach, delivers cumulative 12-week reductions: homocysteine -32%, liver fat -18%, NAFLD score improvement — a backup pathway for the methionine cycle, clinically validated. Caveats: MTHFR variant assessment, kidney monitoring, fishy odor at high dose, pregnancy and methylation sensitivity care, divided dosing with hydration, dietary insufficiency. Pairs with B-complex, choline, creatine. A multi-target molecule in tetrapod’s spring 2026 methylation and detox matrix.