b1

B1, or B-1, is a designation used for several distinct topics in science, medicine, and aviation. The two most common references are the essential nutrient vitamin B1 (thiamine) and the Rockwell B-1 Lancer strategic bomber. In general use, the capitalization and context determine the intended meaning.

Vitamin B1 is an essential water-soluble vitamin required for human health. It functions as a coenzyme, notably thiamine pyrophosphate, in carbohydrate metabolism and the functioning of the nervous system. Thiamine participates in the decarboxylation of pyruvate and in various amino acid reactions. A deficiency can lead to disorders such as beriberi, which can affect the cardiovascular and nervous systems, and Wernicke-Korsakoff syndrome, particularly in chronic alcohol users or those with poor absorption. Good dietary sources include whole grains, pork, legumes, nuts, and fortified foods. Since it is water-soluble and heat-sensitive, thiamine content can decrease with cooking and prolonged storage. Recommended daily allowances vary by age, sex, and life stage, and most people obtain sufficient B1 through a balanced diet or supplementation when needed.

The B-1 Lancer is a four-engine strategic bomber developed for the United States Air Force. It features variable-sweep wings and a high payload capacity, designed to deliver conventional and, historically, nuclear munitions over long ranges. The B-1B version first flew in the early 1980s and entered service in 1986, with later upgrades to navigation, electronics, and weapons systems. The term B-1 is commonly used in aviation shorthand to refer to this aircraft, though historical and technical details depend on the specific variant and era.

In other contexts, B1 may appear as a model or project code in electronics, mathematics, or media designations, but vitamin B1 and the B-1 bomber are the most widely recognized uses.