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From Longman Dictionary of Contemporary English
Related topics: Human, Drugs, medicines
niacinni‧a‧cin /ˈnaɪəsɪn/ noun [uncountable]  a type of vitamin that is good for your skin and your nervous system
Examples from the Corpus
niacinUntreated maize is reluctant to give up its B vitamins, particularly its niacin.
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