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English definition of “niacin”

niacin

noun [U] uk   /ˈnaɪə.sɪn/ specialized us  
one of the vitamin B complex found in foods such as wheat, beef, chicken, and milk, important for producing energy from food and for keeping the digestion and nervous system healthyVitamins and minerals
(Definition of niacin from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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