Skip to main content

Vitamin

Thiamin (Vitamin B1)

Also known as: Thiamine, Thiamine Mononitrate, Vitamin B1

A
Evidence

Thiamin is an essential B vitamin required for carbohydrate metabolism, nerve function, and energy production. It plays a critical role in converting glucose into usable cellular energy.

Find the best Thiamin (Vitamin B1) supplements — free
See Thiamin (Vitamin B1) products scored on dose & form, then track your intake in the app.
Open app →

Daily target & upper limit

1.2 mg / day

Thiamin (Vitamin B1) has an established daily reference intake. See best forms, label synonyms, upper-limit warnings, and top-scoring supplements:

Thiamin (Vitamin B1) dosage reference →

Primary uses

  • Energy metabolism support
  • Nervous system function
  • Carbohydrate metabolism
  • Thiamin deficiency prevention

How it works

  • Cofactor in pyruvate dehydrogenase complex for energy metabolism
  • Essential for transketolase in pentose phosphate pathway
  • Required for myelin formation in nervous system

Dosage

Typical range
1.1–1.2 mg daily (RDA for adults)
Timing
With meals preferred
With food
May be taken with or without food; absorption enhanced with food
Duration
Daily supplementation for chronic support; therapeutic doses may vary
Special populations
Pregnant/lactating women: 1.4 mg daily; higher doses used therapeutically for Wernicke-Korsakoff syndrome

Forms

  • Thiamine Mononitrate· 70/100
  • Thiamine Hydrochloride· 70/100
  • Thiamine Pyrophosphate· 70/100

Safety

Common side effects

  • Very rare; occasional skin reactions at high doses

Contraindications

  • None at nutritional doses; use cautiously in those with known thiamin allergy

Products containing Thiamin (Vitamin B1)

Top-scoring supplements in our catalog that list Thiamin (Vitamin B1) on the label. Each product is graded on Formulate's ingredient-level rubric — dose accuracy, form, transparency, and third-party testing.

Thorne
Craving and Stress Support
96
Thorne
MediClear-SGS™ - Vanilla
95
Thorne
Basic Nutrients 2/Day
93
Thorne
Basic Prenatal
93
See all products →

Evidence notes

Thiamin is an essential micronutrient with extensive clinical evidence supporting its role in metabolism and neurological function. Deficiency prevention and treatment are well-established.

Grade A: Multiple well-designed human trials support the main claims.

Related in Vitamin

Check a full stack

Formulate's free interaction checker lets you paste in any combination of supplements and medications at once — every pairing flags severity, timing, and cited evidence.

Open the checker

Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider.