“Vitamin B1 (Thiamine)?”Here!Thiamine, vitamin B1
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As a supplement
Talk to your doctor or pharmacist.
Roll Call does not check drug interactions or assess personal safety.
A water-soluble B vitamin the body needs to convert food into energy.
Why it’s used
Taken to meet a dietary requirement and to support normal energy metabolism.
What the evidence is for
correcting thiamine deficiency.
What the evidence says
NIH ODS confirms thiamine is essential and that supplementation reliably corrects deficiency (beriberi, Wernicke-Korsakoff syndrome), which occurs mainly in specific populations with poor intake or absorption. Evidence for benefits beyond correcting deficiency, in people with adequate intake, is limited.
Dose studied
1.1–1.2 mg — adult RDA, per NIH ODS.
Context
NIH ODS lists an RDA of about 1.2 mg/day for adult men and 1.1 mg/day for adult women; no tolerable upper intake level has been set because excess is generally excreted.
Rumors
Correcting thiamin deficiency and preventing beriberi — nerve damage and wasting, and in severe cases heart failure or the memory loss and disorientation of Wernicke-Korsakoff syndrome.
Supports — establishedhealth and safety evidence
Studied in: people with thiamin deficiency (e.g., beriberi).
Measured as an outcome.
- Thiamin - Health Professional Fact Sheet (Regulatory) · Funding not checked
How much is a reference amount
- 1.1 mg a dayfor adults 19 and over, women · Recommended Dietary Allowance
No upper limit has been set — the data was not sufficient to set one, which is a gap in the research rather than a finding about safety.
- 1.2 mg a dayfor adults 19 and over, men · Recommended Dietary Allowance
No upper limit has been set — the data was not sufficient to set one, which is a gap in the research rather than a finding about safety.
No UL: the FNB found no reports of adverse effects from high thiamin intakes and did not set one. That is a gap in the adverse-effect data, not a finding of safety.
Every applicable line is shown because we don’t know which one is yours, and a reference intake is a target for a population, not a threshold for harm.