Comparison
Vitamin D3 vs TMG (Trimethylglycine / Betaine)
Vitamin D3
Hormone-like vitamin synthesized in skin from UVB. Profoundly involved in brain function, mood, and inflammation.
TMG (Trimethylglycine / Betaine)
Methyl donor for homocysteine remethylation. Supports methylation when folate or B12 are inadequate. Also studied for athletic performance.
| Field | Vitamin D3 | TMG (Trimethylglycine / Betaine) |
|---|---|---|
| Category | vitamin | vitamin |
| Dose range | 0.025–0.125mg | 500–3000mg |
| Half-life | 360h | — |
| Onset | — | — |
| Evidence | EVIDENCEA | EVIDENCEB |
| Safety | ●●●●● | ●●●●● |
| Legal (US) | USOTC | USOTC |
| PubMed refs | 9200 | 1400 |
The comparison in plain English
Auto-generated from dataVitamin D3 and TMG (Trimethylglycine / Betaine) are both in the vitamin category respectively. Vitamin D3 Hormone-like vitamin synthesized in skin from UVB. TMG (Trimethylglycine / Betaine) Methyl donor for homocysteine remethylation.
Bottom line
Vitamin D3 (evidence A, safety 5/5) has a weaker evidence base than TMG (Trimethylglycine / Betaine) (evidence B, safety 5/5). Vitamin D3 has the slightly cleaner safety profile. For users new to either, the higher-evidence option is the safer first try.
Choose Vitamin D3 if
Vitamin D3 is the better fit when your goal aligns with its mechanism (Vitamin D3 (cholecalciferol) is converted to 25-hydroxyvitamin D in the liver and then to the active hormone 1,25-dihydroxyvitamin D (calcitriol) in the kidneys) and the dose range (0.025–0.125mg) suits your protocol. Half-life is 360h.
Choose TMG (Trimethylglycine / Betaine) if
TMG (Trimethylglycine / Betaine) is the better fit when your goal aligns with its mechanism (Donates a methyl group to homocysteine, regenerating methionine) and the dose range (500–3000mg) suits your protocol. Half-life is —h.