VitaminNo.002

Vitamin B1 (Thiamine)

Energy metabolism, nerve and heart function.

Typical / RDA1.1–1.2 mg
Upper limitNone set
EvidenceStrong

How to take it

Timing MorningFood OptionalForm Thiamine HCl

What to know

Water-soluble with no upper limit. Deficiency is rare in balanced diets but real in heavy alcohol use and some chronic conditions, where it matters a lot.

Interactions & cautions

  • Chronic alcohol use depletes thiamine — a genuine deficiency risk.

Do you actually need it?

Covered by most diets; relevant mainly with heavy alcohol use.

See how this fits your full stack →

Reference values: NIH Office of Dietary Supplements, adult general population. Educational information only — not medical advice. Confirm with a healthcare professional.

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