Vitamin B1 (Thiamin): Dosage, Forms, Safety & Price

What is it?

Identity and form

Vitamin B1 is the essential nutrient thiamin.

Names, aliases and forms

AbbreviationB1

Common NamesThiamine; Thiamin

Mechanisms of action

Biological role

Thiamin diphosphate is a cofactor in carbohydrate and amino-acid metabolism.

Potential effects and evidence map

Evidence is strong for the essential nutrient role of thiamin, but supplementation beyond adequacy has not been shown to produce a reliable general nootropic effect in well-nourished adults. Form-specific clinical uses should be evaluated separately.

Effect domainMagnitudeGrade

Mental energy / wakefulness¹

UnknownConfidence: Medium

Evidence does not establish a reliable mental-energy effect from extra Vitamin B1 (Thiamin) in well-nourished healthy adults.

Note Essential nutrient biology and correction of inadequate status are different from enhancement.

1/5

Memory / learning¹

UnknownConfidence: Medium

Direct evidence does not establish a general memory or learning benefit from Vitamin B1 (Thiamin) for healthy adults.

Note Keep form- and population-specific clinical research separate.

0/5

Typical dosages and timing

Nutrition benchmark¹1.1-1.2 mg/day

Use this to interpret labels and total intake, not as a demonstrated nootropic dose or recommended cycle.

Timing & effect horizon

Effect horizonUnknown

Unknown

What timing evidence can show¹

No reliable acute nootropic onset, duration, claim, or routine cycle is established for Vitamin B1 (Thiamin). Nutrient-status correction and clinical follow-up periods answer different questions.

Safety, side effects and risk profile

Evidence uncertainty¹

Confidence: High

Marketing claims extend beyond the established nutrient or precursor evidence.

Note Separate adequacy, biochemical activity, and enhancement outcomes.

1/5

Interaction risk¹

Confidence: Medium

Medication, laboratory, and total-intake context can change the practical risk.

Note Check the official source for ingredient-specific interaction details.

1/5

GI discomfort¹

Confidence: Medium

Tolerability varies with the specific form and amount consumed.

Note This row summarizes ordinary tolerability rather than special-population hazards.

1/5

Dose- and form-specific safety¹

No tolerable upper intake level has been established because adverse effects from oral thiamin have not been reported at usual supplemental intakes; evidence at very high intakes remains limited.

Interactions and cautions

Medication and test context¹

Furosemide and fluorouracil can affect thiamin status or metabolism.

Practical buying and quality notes

Use the thiamin amount and exact form to compare products; a larger B-complex number is not evidence of a cognitive benefit.¹

FAQ

What distinguishes Vitamin B1 (Thiamin) from related forms?

Hydrochloride and mononitrate are common water-soluble supplemental forms that supply thiamin. Modified thiamin-related compounds require separate evidence and safety assessment rather than automatic use of nutritional B1 claims.