煙酸也被稱為維生素B3，或維生素PP，煙酸，抗癤因子。還包括其衍生物煙酰胺或人體內的煙酰胺。是人體必需的13維生素之壹，屬於維生素B族的水溶性維生素。煙酸在人體內轉化為煙酰胺。煙酰胺是輔酶I和輔酶II的成分，參與脂質代謝、組織呼吸的氧化和糖的厭氧分解。
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