Is niacin (vitamin B3) a single nutrient?

Niacin is a blanket term for a family of compounds with vitamin B3 activity. The terms "niacin" and "vitamin B3" can be used interchangeably, and whenever you find either term on our website, we are referring to the same group of compounds. Basic ...

from The World's Healthiest Foods https://ift.tt/1XCYno9