“Vitamin B1 (thiamine HCl)?”Here!vitamin B1, thiamine
Appears in 5 scanned products.
As a supplement
Talk to your doctor or pharmacist.
Roll Call does not check drug interactions or assess personal safety.
A synthetic form of thiamine, a water-soluble B vitamin involved in converting food into cellular energy.
Why it’s used
Taken to meet daily thiamine needs or address a diagnosed deficiency.
What the evidence is for
correcting thiamine deficiency and supporting normal energy metabolism.
What the evidence says
NIH ODS confirms thiamine is essential and that deficiency causes well-documented conditions such as beriberi, correctable by supplementation. Evidence for benefits beyond meeting normal requirements is limited.
Dose studied
1.1–1.2 mg — adult RDA, per NIH ODS.
Context
NIH ODS lists the adult RDA at about 1.1 to 1.2 mg per day; no tolerable upper intake level has been set because toxicity from oral intake is not well documented.
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.