Thiamin is one of the B vitamins, a group of water-soluble vitamins that are part of many of the chemical reactions in the body.
Vitamin B1; Thiamine
Thiamin (vitamin B1) helps the body's cells change carbohydrates into energy. The main role of carbohydrates is to provide energy for the body, especially the brain and nervous system
Thiamin also plays a role in muscle contraction and conduction of nerve signals.
Thiamin is found in:
- Enriched, fortified, and whole grain products such as bread, cereals, rice, pasta, and flour
- Beef liver and pork
- Dried milk
- Legumes and peas
- Nuts and seeds
Dairy products, fruits, and vegetables are not very high in thiamin, but when eaten in large amounts, they become a significant source.
Thiamin deficiency in the United States is most often seen in people who abuse alcohol (alcoholism). A lot of alcohol makes it hard for the body to absorb thiamin from foods. Unless those with alcoholism receive higher-than-normal amounts of thiamin to make up for the difference, the body will not get enough of the substance. This can lead to a disease called beriberi.
There is no known poisoning linked to thiamin.
The Recommended Dietary Allowance (RDA) for vitamins reflect how much of each vitamin most people should get each day. The RDA for vitamins may be used as goals for each person.
How much of each vitamin you need depends on your age and gender. Other factors, such as pregnancy and illnesses, are also important. Adults and pregnant or breast-feeding women need higher levels of thiamin than young children.
Dietary Reference Intakes for Thiamin:
- 0 - 6 months: 0.2* milligrams per day (mg/day)
- 7 - 12 months: 0.3* mg/day
*Adequate Intake (AI)
- 1 - 3 years: 0.5 mg/day
- 4 - 8 years: 0.6 mg/day
- 9 - 13 years: 0.9 mg/day
Adolescents and Adults
- Males age 14 and older: 1.2 mg/day
- Females age 14 to 18 years: 1.0 mg/day
- Females age 19 and older: 1.1 mg/day
The best way to get the daily requirement of essential vitamins is to eat a balanced diet that contains a variety of foods.
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Sarubin Fragaakis A, Thomson C. The Health Professional's Guide to Popular Dietary Supplements. 3rd ed. Chicago, Il: American Dietetic Association;2007.
Institute of Medicine. Food and Nutrition Board. Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, PantothenicAcid, Biotin, and Choline. National Academy Press, Washington, DC, 1998.
Mason JB. Vitamins, trace minerals, and other micronutrients. In: Goldman L, Ausiello D, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 225.
Last reviewed 2/18/2013 by Alison Evert, MS, RD, CDE, Nutritionist, University of Washington Medical Center Diabetes Care Center, Seattle, Washington. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, David R. Eltz, Stephanie Slon, and Nissi Wang.
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