“Thiamin?”Here!Vitamin B1
Appears in 2 scanned products.
As a supplement
Talk to your doctor or pharmacist.
Roll Call does not check drug interactions or assess personal safety.
Thiamin is a water-soluble B vitamin the body uses to convert food into usable energy and to support nerve function. It cannot be stored in meaningful amounts, so it needs regular dietary intake.
Why it’s used
Taken to meet daily requirements for thiamin, particularly by people whose diet or health situation puts them at risk of low intake.
What the evidence is for
correcting thiamin deficiency and preventing beriberi.
What the evidence says
NIH ODS describes thiamin as essential, with severe deficiency causing beriberi and Wernicke-Korsakoff syndrome; correcting deficiency reliably resolves these conditions. Evidence for benefits of thiamin supplementation in people who are not deficient is limited.
Dose studied
1.1–1.2 mg — adult RDA, per NIH ODS.
Context
Adult intake recommendations are set around 1.1 to 1.2 mg per day. No tolerable upper intake level has been set because high oral doses have not shown adverse effects in available data.
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/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.