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What is Niacin?. Niacin is a water-soluble, Niacin, is an essential vitamin (B3) that your body cannot produce on its own. You can also find Niacin as an ingredient in topical skin care products like creams, serums, sprays, and more.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.