Deficiency/Cognition/Heart

Vitamin B1 (Thiamine)

Essential B vitamin that helps turn carbohydrates into energy and mainly benefits adults with low intake or deficiency risk.

Vitamin B1 (Thiamine)

Essential B vitamin that helps turn carbohydrates into energy and mainly benefits adults with low intake or deficiency risk.

score

evidence

Safe

risk

Proven Benefits

01Corrects thiamine deficiency

02Prevents beriberi/Wernicke

03Improves deficiency neuro symptoms

04May improve heart failure function

05May improve mental clarity

06May lower microalbuminuria

Chemical Forms

Recommended

Thiamine hydrochloride
Thiamine mononitrate
Benfotiamine

Avoid

Sulbutiamine (different synthetic derivative; not standard for B1 repletion)

Expert Note

Thiamine hydrochloride and mononitrate are the standard, stable forms used for routine replacement. Benfotiamine is a lipid-soluble derivative that can raise peripheral thiamine status more efficiently at higher doses, but it is not clearly superior for basic nutritional coverage. Sulbutiamine is a separate synthetic compound marketed more for stimulant-like cognitive effects than straightforward B1 repletion.

Protocol

Amount

10-50 mg

Frequency

Once daily

When

Any time of day — consistency matters more than timing; take with food if it causes stomach upset.

Condition-Based Dosing

Healthy adults with low dietary intake

5-10 mg daily— Usually enough to cover diet gaps above the 1.1-1.2 mg adult RDA.

Adults with confirmed low thiamine status, without neurologic emergency

25-100 mg daily for 4-8 weeks, then retest— Suspected Wernicke encephalopathy or severe symptoms needs urgent medical care and often parenteral thiamine.

Adults at higher risk from frequent alcohol use or loop diuretics

10-50 mg daily— Higher losses or lower intake make standard multivitamin doses more likely to fall short.

Safety & Limits

Upper Safe Limit

No official UL established for adults (IOM/NIH ODS); oral thiamine is generally well tolerated, and doses up to 100 mg/day are commonly used in supplements.

Cycling

Safe for continuous use

Synergies

Magnesium

Magnesium is required to activate thiamine into thiamine pyrophosphate and to run several thiamine-dependent enzymes.

Avoid Combining With

✕Alcohol (impairs absorption and conversion to active thiamine)
✕Loop diuretics like furosemide (increase urinary thiamine losses)
✕High sulfite exposure from some preserved foods or drinks (degrades thiamine)
✕Raw freshwater fish or betel nut eaten often (contain antithiamine factors)

Updated Invalid Date