niacin
noun
ni·a·cin ˈnī-ə-sən 
: an acid C6H5NO2 of the vitamin B complex found widely in animals and plants and used especially against pellagra
also : nicotinamide
called also nicotinic acid
Example Sentences
Recent Examples on the Web It's made with hydrolyzed collagen, peptides, niacin, hyaluronic acid, antioxidants, and vitamins. 
Daisy Maldonado, SELF, 16 Sep. 2022 According to PetMD, cats also need higher proportions of protein in their diet than dogs, as well as taurine, arachidonic acid, vitamin A and niacin. Jacob Livesay, USA TODAY, 22 July 2022 Whole grains also provide important micronutrients, including vitamin E and various B vitamins such as riboflavin, thiamine, niacin, and folate, that offer critical support to digestion, the nervous system, and more, Caplan says. Christine Byrne, Outside Online, 14 Mar. 2019 Coffee also contains trace amounts of vitamins and minerals like calcium, iron, potassium, magnesium, and niacin. Marygrace Taylor, SELF, 31 May 2022 Some brands, like Impossible and Beyond, also add a bunch of vitamins and minerals—zinc, niacin, and B vitamins, for example—to try and replicate those found naturally in beef. Ali Francis, Bon Appétit, 19 Apr. 2022 Niacinamide, which is also called nicotinamide, is a form of vitamin B3 (niacin) found in supplements, skin-care products, and food. SELF, 22 Mar. 2022 In large doses, niacin can cause blurred vision and liver damage. Laura J. Nelson, Los Angeles Times, 14 Mar. 2022 Rice cakes also provide small amounts of the B vitamin niacin—which helps convert carbohydrates into fuel for the body to use—and trace amounts of other minerals, including magnesium and zinc. Cynthia Sass, Mph, Health.com, 4 Feb. 2022 See More
Daisy Maldonado, SELF, 16 Sep. 2022 According to PetMD, cats also need higher proportions of protein in their diet than dogs, as well as taurine, arachidonic acid, vitamin A and niacin. Jacob Livesay, USA TODAY, 22 July 2022 Whole grains also provide important micronutrients, including vitamin E and various B vitamins such as riboflavin, thiamine, niacin, and folate, that offer critical support to digestion, the nervous system, and more, Caplan says. Christine Byrne, Outside Online, 14 Mar. 2019 Coffee also contains trace amounts of vitamins and minerals like calcium, iron, potassium, magnesium, and niacin. Marygrace Taylor, SELF, 31 May 2022 Some brands, like Impossible and Beyond, also add a bunch of vitamins and minerals—zinc, niacin, and B vitamins, for example—to try and replicate those found naturally in beef. Ali Francis, Bon Appétit, 19 Apr. 2022 Niacinamide, which is also called nicotinamide, is a form of vitamin B3 (niacin) found in supplements, skin-care products, and food. SELF, 22 Mar. 2022 In large doses, niacin can cause blurred vision and liver damage. Laura J. Nelson, Los Angeles Times, 14 Mar. 2022 Rice cakes also provide small amounts of the B vitamin niacin—which helps convert carbohydrates into fuel for the body to use—and trace amounts of other minerals, including magnesium and zinc. Cynthia Sass, Mph, Health.com, 4 Feb. 2022 See More Word History
Etymology
nicotinic acid + -in entry 1
First Known Use
1942, in the meaning defined above
Medical Definition
niacin
noun
ni·a·cin ˈnī-ə-sən
: a crystalline acid C6H5NO2 that is a member of the vitamin B complex occurring usually in the form of a complex of niacinamide in various animal and plant parts (as blood, liver, yeast, bran, and legumes) and is used especially to lower LDL and triglyceride levels in the blood and to treat pellagra
called also nicotinic acid