Vitamin B1 (Thiamine) for Cognitive Function
Thiamine restores cognition dramatically in deficiency states such as alcohol misuse, but does little in well-nourished people.
Overview
Verdict
How It Works
Dosing & Protocol
Typical dose
- Recommended dose
- 100 mg oral daily for at-risk repletion; parenteral thiamine as prescribed where Wernicke encephalopathy is suspected
- Expected timeframe
- Days in acute deficiency; 4-8 weeks for milder repletion
Protocol
- step 1
- Identify deficiency risk - chronic alcohol use, bariatric surgery, prolonged vomiting, malnutrition, diuretic therapy
- step 2
- Suspected Wernicke encephalopathy is an emergency needing high-dose parenteral thiamine in hospital, not capsules
- step 3
- For at-risk repletion outside that setting, 100 mg oral thiamine daily with food
- timing
- With food; any time of day
- critical
- In alcohol-related presentations thiamine must be given before intravenous glucose, which can otherwise precipitate Wernicke encephalopathy
- duration
- Reassess at 4-8 weeks
- key point
- Cochrane reviews find no reliable cognitive benefit in people who are not deficient - the effect is entirely about correcting deficiency
Evidence
What the studies say
Thiamine for prevention and treatment of Wernicke-Korsakoff Syndrome in people who abuse alcohol
Day E, Bentham PW, Callaghan R
Thiamine remains standard care given the severity of untreated confusion and ataxia.
Safety
Caveats
Wernicke-Korsakoff syndrome is a medical emergency - oral supplements are inadequate. No cognitive benefit has been shown in replete adults. Thiamine is water-soluble with no established toxic ceiling, but high-dose parenteral forms carry rare anaphylaxis risk and belong in clinical settings. Safe in pregnancy at normal doses, and often needed in hyperemesis gravidarum under medical care.
Less likely to help if
Medical Disclaimer
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Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.