Thiamin (from baker’s yeast, rice bran, rice fiber and organic fruit and vegetable powders)

Thiamin is a water-soluble B-complex vitamin, also known as vitamin B1. It functions as a coenzyme in the metabolism of carbohydrates and branched-chain amino acids 1. Dietary sources of thiamin include beef, pork, breads, seeds and whole grain cereals. Dietary thiamin is minimally absorbed through the intestine.

The U.S. Food and Drug Administration (FDA) has established a Reference Daily Intake (RDI) of 1.5 mg thiamin for adults and children 4 or more years of age (21CFR101.9). RDIs are a set of dietary references for essential vitamins and minerals that are considered amounts sufficient to meet the daily requirements of healthy individuals. RDIs serve as the basis for calculating the percent daily value (%DV) amounts found on dietary supplement and food labels.

Baker’s yeast, Saccharomyces cerevisiae, also known as brewer’s yeast, is a yeast often used for baking or brewing. It is an excellent source of the essential B vitamins, including folic acid, niacin, biotin, pantothenic acid, riboflavin, thiamin and vitamin B6 2.

Rice bran is made from the bran layer, underneath the hull layer, of rice, Oryza sativa. Rice bran is high in dietary fiber, and is an excellent source of protein, vitamin E, thiamin, niacin, vitamin B6, pantothenic acid and a number of minerals, such as iron and magnesium. It is also a good source of folate and riboflavin 3. Rice bran also contains beta-sitosterol and other phytosterols, along with the essential omega-3 fatty acid alpha-linolenic acid (ALA) 4.

Organic fruit and vegetable powders are obtained from organically grown fruits and vegetables, including strawberry, raspberry, blueberry, cherry, pomegranate, cranberry, broccoli, tomato, carrot, spinach and kale.

This ingredient can be found in the following products in United States:


  1. Institute of Medicine. Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline. Washington, D.C.: National Academy Press, 2000
  2. Natural Medicines. Comprehensive Database. Therapeutic Research Faculty, 2003
  3. United States Department of Agriculture. USDA National Nutrient Database for Standard Reference, Release 21. 2008.
  4. Natural Medicines: Comprehensive Database. Stockton, CA: Therapeutic Research Faculty, 2000