Vitamin
Vitamin B1 (Thiamine)
Also known as: Thiamine, Thiamin, Aneurin, Vitamin B1
Thiamine is an essential B-vitamin that functions as a coenzyme in carbohydrate and amino acid metabolism. Thiamine HCl is a stable, highly bioavailable form.
Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.
Every Vitamin B1 (Thiamine) product we have scored
| # | Product | Score | Per serving |
|---|---|---|---|
| 1 | Thorne Craving and Stress Support | 93 A | $1.33 |
| 2 | Pure Encapsulations B-Complex liquid | 91 A | $1.34 |
| 3 | Nature Made B-Complex with C Caplets | 90 A | $0.11 |
| 4 | Complement Gut Nurture | 89 A | $1.93 |
| 5 | Nutricost Pre-Workout For Women Powder | 89 A | $0.73 |
| 6 | Nutricost Pre-Workout Complex | 89 A | $0.83 |
| 7 | Garden of Life Vitamin Code Raw B-Complex | 89 A | $0.50 |
| 8 | Thorne Advanced Nutrients | 88 A | $2.40 |
| 9 | Thorne Basic Nutrients 2/Day | 88 A | $0.60 |
| 10 | Thorne Basic Prenatal | 88 A | $1.23 |
| 11 | Thorne Men's Multi 50+ | 88 A | $1.87 |
| 12 | Garden of Life Vitamin Code 50 & Wiser Women | 87 A | $1.01 |
Scored on dose accuracy, form, label transparency and third-party testing. Per-serving cost is list price divided by servings per container. No brand pays to be listed or ranked.
Common questions
How much Vitamin B1 (Thiamine) should I take?
The typical range is 25-100 mg daily. Safe long-term
When should I take Vitamin B1 (Thiamine)?
With food. Yes.
Which form of Vitamin B1 (Thiamine) is best?
Thiamine HCl — Standard. Other forms in the catalog: Benfotiamine, thiamine mononitrate, benfotiamine (lipophilic form).
Is Vitamin B1 (Thiamine) safe?
Commonly reported: Very safe. Serious warnings: None at normal doses. Water-soluble, excreted
Which Vitamin B1 (Thiamine) supplement scores highest?
Thorne Craving and Stress Support, at 93/100. Scored on dose accuracy, form, label transparency and third-party testing — no brand pays to be listed or ranked.
Daily target & upper limit
1.2 mg / dayVitamin B1 (Thiamine) has an established daily reference intake. See best forms, label synonyms, upper-limit warnings, and top-scoring supplements:
Vitamin B1 (Thiamine) dosage reference →Primary uses
- Energy metabolism
- Nerve function
- Carbohydrate metabolism
- Energy metabolism (carbohydrate and branched-chain amino acid oxidation)
- Nervous system function and myelin formation
- Cognitive function
- Deficiency prevention (Wernicke-Korsakoff syndrome)
How it works
- Cofactor for pyruvate dehydrogenase
- Essential for acetyl-CoA production
- Supports nerve membrane function
Dosage
- Typical range
- 25-100 mg daily
- Timing
- With food
- With food
- Yes
- Duration
- Safe long-term
- Special populations
- Alcoholics at high risk of deficiency
Forms
- Thiamine HCl
- Benfotiamine
- thiamine mononitrate· 70/100
Safety
Common side effects
- Very safe
Contraindications
- None
Products containing Vitamin B1 (Thiamine)
Top-scoring supplements in our catalog that list Vitamin B1 (Thiamine) on the label. Each product is graded on Formulate's ingredient-level rubric — dose accuracy, form, transparency, and third-party testing.
Evidence notes
Essential B vitamin
Grade A: Multiple well-designed human trials support the main claims.
Related in Vitamin
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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Individual needs and risks vary — consult a professional before starting, stopping, or combining supplements, especially if you are pregnant or nursing, taking medication, or managing a health condition.