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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 high-quality randomised trials published 1999–2026 with a typical study size of 315 participants.
Based on 5 studies · 3 RCTs · 791 total participants
Confidence
Moderate confidenceBy outcome
Human evidence is limited to three small, low-quality studies; the only RCT found no overall fatigue benefit versus placebo, with support resting on a mechanistic rationale.
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.
Avoid — reports of mood elevation/agitation.
Avoid — insufficient data.
Few documented interactions; data are sparse. This possible interaction has not been individually evaluated for this supplement; its likelihood and severity are unknown. If you take an anticoagulant or antiplatelet medicine, ask a pharmacist or prescriber before using this product. Do not stop or change prescribed medicines based on this notice.
Tip: Lower dose; dose earlier in the day
Tip: Avoid in bipolar disorder
Tip: Use intermittently
Sulbutiamine has an evidence score of 3/10 — emerging evidence based on 4 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.
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. Reported side effects are uncommon and include agitation/anxiety, tolerance with continuous use, mood elevation (bipolar). Use caution if any of these apply to you: Bipolar disorder (reports of mood elevation/agitation); Pregnancy/breastfeeding (insufficient data).
Caffeine
Likely helpsBlocks adenosine receptors to boost alertness, reaction time, and endurance — one of the most proven ergogenic aids.
Citicoline
Probably helpsDual precursor to acetylcholine and phosphatidylcholine — enhances memory, focus, and brain cell membrane repair.
Nicotinamide Riboside
Mostly mechanism / observationalA vitamin B3 precursor that reliably raises cellular NAD+ levels and is well tolerated — but human trials have so far shown mostly null or mixed results on the functional outcomes (muscle, metabolism, blood pressure, cognition) that elevation is meant to drive.
Theacrine
Mostly mechanism / observationalCaffeine-like purine alkaloid from kucha tea. Small RCTs suggest subjective energy and mood benefits and good safety, but objective performance gains are inconsistent.
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Reviewed by Dr. Baher Al Hakim · Last reviewed June 2026 · evidence from 5 studies · how we score · editorial policy
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.
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