Trimethylglycine / Betaine

TMG · 甜菜碱 Betaine

Place · Level 3 · Supplement

甘氨酸戴 3 个甲基 · 同型半胱氨酸再甲基化双轨制副路 · MTHFR 突变者最受益 · 一碳代谢最后一块拼图

Connected to · 3

synergy · 3

Choline
Choline and betaine are two ends of one methyl ledger. In the liver choline is oxidised to betaine (a one-way step — there's no route back), and betaine hands over its methyl to turn homocysteine back into methionine. Run the other way: short on choline, the liver takes the backup line (PEMT) and builds choline-containing phospholipid itself — burning three methyls per molecule. So 'not eating enough choline' and 'methylation is under strain' are two descriptions of the same thing in the liver.
Vitamin B12
TMG fuels the BHMT backup; when MTR is limited by B12 / folate / MTHFR, betaine carries Hcy back to methionine.
Folate
There are two routes back from homocysteine to methionine: one runs on folate and B12, the other has TMG (betaine) hand over a methyl directly. Under methylation strain they run in parallel — neither replaces the other.

Glycine with 3 methyls

Stop 1/5

身份 · 三甲基化的甘氨酸

TMG (trimethylglycine) = glycine + three methyl groups (-N(CH₃)₃⁺); its formal chemical name is betaine — named because it was first isolated from sugar beet (*Beta vulgaris*) in 1866.

Chemical structure:

The amine group (-NH₂) of glycine is replaced by three methyls → a quaternary ammonium compoundPositive and negative charges coexist (-N(CH₃)₃⁺ + -COO⁻) → a zwitterion, which is the root of its 'osmolyte' (osmoprotectant) propertyWater-soluble, mildly sweet (this is also where the '-ine' suffix in 'betaine' comes from)
Two independent roles:

1. Cellular osmoprotectant: protects cellular protein structure under hypertonic (high-salt) or dehydrated conditions (a member of the same osmolyte family as taurine / sorbitol / creatine)
2. Methyl donor: via the BHMT enzyme, it donates a methyl group to homocysteine → methionine (next scene)

Two ways the body obtains TMG:

Food: wheat germ / whole wheat / spinach / beetroot / quinoa / seafood (scallops, shrimp)Endogenous synthesis: choline → betaine — choline dehydrogenase + BADH in mitochondria oxidize choline in two steps into TMG
The second path links TMG directly to the choline story — choline is not just raw material for phospholipids / ACh / hepatic lipid transport, it is also the endogenous precursor of TMG and therefore supports the dual-track methylation system.

Read story

Educational content, not medical advice — consult a clinician.

Back

Trimethylglycine / Betaine

TMG · 甜菜碱 Betaine

Place · Level 3 · Supplement

甘氨酸戴 3 个甲基 · 同型半胱氨酸再甲基化双轨制副路 · MTHFR 突变者最受益 · 一碳代谢最后一块拼图

Connected to · 3

synergy · 3

Choline
Choline and betaine are two ends of one methyl ledger. In the liver choline is oxidised to betaine (a one-way step — there's no route back), and betaine hands over its methyl to turn homocysteine back into methionine. Run the other way: short on choline, the liver takes the backup line (PEMT) and builds choline-containing phospholipid itself — burning three methyls per molecule. So 'not eating enough choline' and 'methylation is under strain' are two descriptions of the same thing in the liver.
Vitamin B12
TMG fuels the BHMT backup; when MTR is limited by B12 / folate / MTHFR, betaine carries Hcy back to methionine.
Folate
There are two routes back from homocysteine to methionine: one runs on folate and B12, the other has TMG (betaine) hand over a methyl directly. Under methylation strain they run in parallel — neither replaces the other.

Glycine with 3 methyls

Stop 1/5

身份 · 三甲基化的甘氨酸

TMG (trimethylglycine) = glycine + three methyl groups (-N(CH₃)₃⁺); its formal chemical name is betaine — named because it was first isolated from sugar beet (*Beta vulgaris*) in 1866.

Chemical structure:

The amine group (-NH₂) of glycine is replaced by three methyls → a quaternary ammonium compoundPositive and negative charges coexist (-N(CH₃)₃⁺ + -COO⁻) → a zwitterion, which is the root of its 'osmolyte' (osmoprotectant) propertyWater-soluble, mildly sweet (this is also where the '-ine' suffix in 'betaine' comes from)
Two independent roles:

1. Cellular osmoprotectant: protects cellular protein structure under hypertonic (high-salt) or dehydrated conditions (a member of the same osmolyte family as taurine / sorbitol / creatine)
2. Methyl donor: via the BHMT enzyme, it donates a methyl group to homocysteine → methionine (next scene)

Two ways the body obtains TMG:

Food: wheat germ / whole wheat / spinach / beetroot / quinoa / seafood (scallops, shrimp)Endogenous synthesis: choline → betaine — choline dehydrogenase + BADH in mitochondria oxidize choline in two steps into TMG
The second path links TMG directly to the choline story — choline is not just raw material for phospholipids / ACh / hepatic lipid transport, it is also the endogenous precursor of TMG and therefore supports the dual-track methylation system.

Read story

Educational content, not medical advice — consult a clinician.