Last verified: 20 days ago
Sulbutiamine
Also known as: isobutyryl thiamine disulfide, Arcalion, Enerion, vitamin B1 analogue
Evidence under review. — Not yet rated
Synthetic vitamin B1 derivative. May reduce fatigue and psychomotor sluggishness, but evidence is limited and mixed.
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What it does
Sulbutiamine is a synthetic, fat-soluble form of vitamin B1 (thiamine) that crosses the blood-brain barrier more easily than regular thiamine. It has been studied primarily as an add-on treatment...
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Evidence quality
Evidence base hasn't been formally rated yet. See research below.
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Clinical dose
400-600 mg daily based on study doses
What the Science Says
Sulbutiamine is a synthetic, fat-soluble form of vitamin B1 (thiamine) that crosses the blood-brain barrier more easily than regular thiamine. It has been studied primarily as an add-on treatment for fatigue and psychomotor inhibition — the mental sluggishness and low motivation that can accompany illness or depression. Small clinical trials suggest it may help reduce fatigue in multiple sclerosis patients and speed recovery of mental energy during infections, typically at doses of 400–600 mg per day over several weeks.
What It Doesn't Do
Not a proven standalone treatment for depression — studies show it has no direct antidepressant effect. Won't reliably cure chronic fatigue on its own; the main RCT found no significant benefit over placebo at 28 days. Not a proven cognitive enhancer for healthy people. No solid human evidence it fights cancer or protects kidneys — those findings are from animal or cell studies only.
Evidence-Based Benefits
Sulbutiamine is a synthetic, fat-soluble form of vitamin B1 (thiamine) that crosses the blood-brain barrier more easily than regular thiamine. It has been studied primarily as an add-on treatment for fatigue and psychomotor inhibition — the mental sluggishness and low motivation that can accompany illness or depression. Small clinical trials suggest it may help reduce fatigue in multiple sclerosis patients and speed recovery of mental energy during infections, typically at doses of 400–600 mg per day over several weeks.
Weak EvidenceEffective at: 400-600 mg daily based on study doses
Source: auto-research
Absorption & Bioavailability
Good — sulbutiamine is lipophilic (fat-soluble), which allows it to cross the blood-brain barrier more readily than standard thiamine. This is its primary pharmacological advantage over regular vitamin B1.
Red Flags to Watch For
- Documented case of addiction and dependence in a patient with bipolar disorder — escalating doses were needed and psychiatric care was severely disrupted
- Can interfere with psychiatric treatment outcomes, particularly in patients with mood disorders
- Most positive studies are small, uncontrolled, or industry-funded; the largest RCT (326 patients) found no significant benefit for chronic fatigue
- Widely sold OTC and online despite limited evidence, creating potential for misuse
- Animal and cell-study findings (kidney protection, anticancer effects) are frequently misrepresented in marketing as proven human benefits
Products Containing Sulbutiamine
See how Sulbutiamine is used in these analyzed products:
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-05-02