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Sulbutiamine (Arcalion)
A synthetic, fat-soluble vitamin B1 (thiamine) derivative that crosses into the brain, marketed for fatigue and focus — but human evidence is sparse, low-quality, and mixed (a fatigue RCT showed only modest, non-sustained effects).
What the evidence says
Most Sulbutiamine studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from medium-quality randomised trials published 1999–2020 with a typical study size of 315 participants.
Based on 3 studies · 1 RCT · 341 total participants
Confidence
LowBy outcome
Sulbutiamine has an evidence score of 3/10 — emerging evidence based on 3 indexed studies. A synthetic, fat-soluble vitamin B1 (thiamine) derivative that crosses into the brain, marketed for fatigue and focus — but human evidence is sparse, low-quality, and mixed (a fatigue RCT showed only modest, non-sustained effects). Representative study: PMID 10573727.
The commonly studied dose of Sulbutiamine is 400-600mg daily, split (morning/midday); short-term use. Individual needs vary — start at the lower end of the range and adjust based on how you respond.
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Last reviewed June 2026 · evidence from 3 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
Sulbutiamine (Arcalion) is a synthetic, lipophilic derivative of thiamine (vitamin B1) designed to cross the blood-brain barrier more readily than thiamine itself, raising central thiamine and influencing cholinergic, dopaminergic, and glutamatergic signaling. It's marketed for asthenia (fatigue), focus, and mood. The honest picture: human evidence is thin and low-quality — a randomized trial in chronic post-infectious fatigue showed only mixed, non-sustained benefit, and most other support is small or open-label. It is not a substitute for correcting an actual thiamine deficiency.
Lipophilic; crosses the blood-brain barrier to raise brain thiamine more than thiamine itself.
Influences cholinergic, dopaminergic, and glutamatergic signaling.
How Sulbutiamine works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
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400-600mg daily, split (morning/midday); short-term use
Take with food
| Form | Type |
|---|---|
| 💊Sulbutiamine (Arcalion) | Recommended |
| 💊Capsule | Alternative |
Distinct from regular thiamine; not for treating deficiency.
Minimum: 1 weeks
Optimal: 4 weeks
Cycling: Use short-term/intermittently; tolerance and mood changes are reported with continuous use.
Note: Earlier in the day; short-term.
Dose-response data unavailable. The current published research for Sulbutiamine does not provide sufficient dose-specific outcome data to generate reliable dose-response curves.
Refer to the Dosage & Timing section above for recommended dose ranges based on available evidence.
May ease asthenia/fatigue (weak evidence).
Proposed cognitive/focus effect.
Avoid — reports of mood elevation/agitation.
Avoid — insufficient data.
Few documented interactions; data are sparse.
Tip: Lower dose; dose earlier in the day
Tip: Avoid in bipolar disorder
Tip: Use intermittently
The best time to take Sulbutiamine is in the morning. Taking it with food is preferred. Dosed earlier in the day (can be stimulating); short-term use is typical.
Sulbutiamine is generally safe at recommended doses, with a few precautions worth noting. The most commonly reported side effects are agitation/anxiety, mood elevation (bipolar), tolerance with continuous use. Use caution if any of these apply to you: Bipolar disorder (reports of mood elevation/agitation); Pregnancy/breastfeeding (insufficient data).
Dual precursor to acetylcholine and phosphatidylcholine — enhances memory, focus, and brain cell membrane repair.