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