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.
Questions people ask about vitamin b1 (thiamine)
- Can You Take Too Much Vitamin B1 Thiamine? Side Effects and Daily LimitsNo — Vitamin B1 (Thiamine) has no set upper limit, as your body excretes excess. Learn the 1.1–1.2 mg RDA, who benefits from higher doses, and rare side effects.
- Does Thiamine (vitamin B1) Really Help with Nerve Pain?Thiamine (Vitamin B1) is essential for nerve function. It can help nerve pain, especially when a deficiency is present, such as in chronic alcohol use. The RDA is 1.1–1.2 mg, and there is no upper limit set.
- Thiamine and Riboflavin: Interaction, Absorption, and SafetyYes, thiamine (Vitamin B1) and riboflavin (Vitamin B2) are safe to take together. Both are water-soluble B vitamins with no set upper limit, and they do not compete for absorption.
Reference values: NIH Office of Dietary Supplements, adult general population. Educational information only — not medical advice. Confirm with a healthcare professional.