B3

B3
Name	B3
Caption	Structural formulas of niacin and nicotinamide
Synonyms	Niacin; Nicotinic acid; Nicotinamide; Vitamin PP
Type	Water-soluble vitamin
Discovery	1930s
Sources	Liver (food), Yeast, Peanut, Cereal
Functions	Electron transfer coenzymes; NAD⁺/NADP⁺ precursors
Deficiency	Pellagra

B3 B3 is the common designation for the vitamin class encompassing niacin and related amides and esters, essential in human and animal physiology. First identified in nutritional studies in the early 20th century, it was linked to deficiency diseases and later connected to coenzymes that participate in redox reactions. B3 connects to major figures and institutions in nutritional science, clinical medicine, and public health through research on pellagra, lipid disorders, and metabolic regulation.

Etymology and Nomenclature

The term "niacin" emerged from biochemical nomenclature developments alongside work by researchers at institutions such as the USDA and laboratories associated with Institute of Nutrition of Central America and Panama (INCAP). Alternate names include "nicotinic acid" and "nicotinamide" (also "niacinamide"), with historical terminology "vitamin PP" reflecting the link to "pellagra-preventive" activity described by investigators like Joseph Goldberger and public-health bodies including the League of Nations Health Organization. Chemical naming conventions align with recommendations from bodies like the International Union of Pure and Applied Chemistry.

Chemical and Biological Forms

B3 exists in multiple chemical forms: nicotinic acid (pyridine-3-carboxylic acid), nicotinamide (pyridine-3-carboxamide), and esters such as nicotinamide riboside and nicotinamide mononucleotide, each connected with pathways studied in labs led by researchers at Harvard Medical School, Massachusetts Institute of Technology, and institutions like the Salk Institute. These forms are precursors to the coenzymes NAD⁺ (nicotinamide adenine dinucleotide) and NADP⁺ (nicotinamide adenine dinucleotide phosphate), central to enzymatic systems described by work at Rockefeller University and incorporated into metabolic maps produced by collaborators at Max Planck Institute for Biochemistry.

Natural Sources and Synthesis

Dietary B3 is found in varied foods traditionally documented by agencies like the Food and Agriculture Organization and the World Health Organization. Rich natural sources include liver (food), brewer's yeast, peanut, mushroom species catalogued by herbaria tied to Kew Gardens, and fortified cereals developed by companies such as Kellogg Company and General Mills. Tryptophan conversion to B3 in humans involves enzymatic steps characterized by investigators at University of Cambridge and Johns Hopkins University, with the kynurenine pathway linking to research on enzymes studied at the National Institutes of Health. Industrial chemical synthesis of nicotinic acid traces to organic chemists at firms like BASF and laboratories at DuPont.

Biological Functions and Health Effects

B3-derived cofactors, notably NAD⁺ and NADP⁺, participate in pivotal reactions in pathways elucidated by scientists at California Institute of Technology and University of Oxford, including oxidative phosphorylation in mitochondria examined at Yale University and glycolysis characterized by work at University of Chicago. Role in DNA repair and sirtuin-mediated signaling connects B3 metabolism to studies at Columbia University and the Buck Institute for Research on Aging. Clinically, deficiency results in pellagra—historically documented in outbreaks investigated by Joseph Goldberger and public-health responses coordinated by Centers for Disease Control and Prevention and national health ministries. Therapeutically, nicotinic acid has been used to modulate plasma lipids in trials conducted at institutions like Mayo Clinic and Cleveland Clinic, while nicotinamide and novel precursors such as nicotinamide riboside have been evaluated in clinical studies at Mount Sinai Hospital and research centers affiliated with University College London for effects on metabolic health and aging.

Industrial and Commercial Uses

Beyond nutrition, nicotinic acid and derivatives are applied in chemical manufacturing sectors represented by corporations including BASF and Heraeus; nicotinamide finds use in cosmetics and dermatology products tested in clinics like St. John's Institute of Dermatology and marketed by companies such as L'Oréal and Beiersdorf. Food fortification programs implemented by national agencies and food manufacturers—historically involving Kellogg Company, General Mills, and government programs in United States Department of Agriculture policy—use niacin to address population-level deficiencies. In pharmaceuticals, extended-release niacin formulations were developed and trialed by firms including Merck and Pfizer for dyslipidemia management, with regulation and post-market evaluation involving agencies such as the Food and Drug Administration and the European Medicines Agency.

Safety, Toxicity, and Regulation

At pharmacologic doses, nicotinic acid can produce flushing, hepatotoxicity, and glucose intolerance—adverse effects documented in clinical trials at centers like Brigham and Women's Hospital and regulatory reviews by the Food and Drug Administration. Nicotinamide generally shows a different safety profile but may carry risks at high doses, assessed in studies at National Institutes of Health clinical units. Regulatory frameworks for labeling, fortification, and therapeutic claims involve the World Health Organization, Codex Alimentarius Commission, and national regulators including the Food and Drug Administration and the European Food Safety Authority. Occupational exposure and material safety data sheets for industrial producers such as BASF and DuPont prescribe handling limits and hazard classifications monitored by agencies like the Occupational Safety and Health Administration.

Category:Vitamins