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.