Vitamin B1

Thiamine

Water-soluble vitamins

Aliases / common names

Thiamin; thiamine HCl; benfotiamine

Natural food sources

Whole grains, pork, legumes, nuts, seeds and fortified cereals.

Main wellness functions

Coenzyme for carbohydrate metabolism; supports nerve and heart function.

Deficiency signs

Beriberi, Wernicke-Korsakoff syndrome, fatigue, neuropathy, poor appetite and heart failure signs.

Recommended intake

Adults: 1.1 mg/day women, 1.2 mg/day men. Children: about 0.5-1.2 mg/day. Pregnancy: 1.4 mg/day. No established UL.

Excess intake effects

Toxicity is rare; occasional stomach upset or allergic-type reactions are reported.

Contraindicated / caution groups

People with suspected deficiency, alcohol use disorder or bariatric surgery history should seek medical assessment rather than self-treating severe symptoms.

Common dosage forms

Tablets, capsules, B-complex, injections in clinical settings; benfotiamine specialty products.

Common product strengths

1.5-100 mg; benfotiamine often 150-300 mg.

Use precautions

Needs may rise with high carbohydrate intake, alcohol use and diuretic use.

Supplement notes

Water-soluble; regular intake matters because storage is limited.

This information is for general nutrition education and product reference only. It does not replace medical diagnosis, treatment or individualized dietary advice.