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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
Sulbutiamine doesn't have enough studies with structured effect-size data yet to pool a verdict. Browse the studies below for individual findings.
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 · 341 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 5 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 has a safety rating of "moderate". That is a category, not a measure of individual risk, and there are precautions worth knowing. Reported side effects include mood elevation (bipolar), agitation/anxiety, tolerance with continuous use. How often they occur is not established for all of them. Use caution if any of these apply to you: Bipolar disorder (reports of mood elevation/agitation); Pregnancy/breastfeeding (insufficient data).
Caffeine
Probably helpsBlocks adenosine receptors to boost alertness, reaction time, and endurance — an umbrella review of 21 meta-analyses found it ergogenic for endurance, strength and power.
Nicotinamide Riboside
Too few graded studiesA 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.
CoQ10
Likely helpsA lipid-soluble antioxidant central to mitochondrial energy production, with the strongest trial support for fertility/IVF outcomes and heart failure.
Citicoline
Probably helpsPrecursor to acetylcholine and phosphatidylcholine. One trial in 100 healthy older adults improved memory. Stroke trials are mixed.
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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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