These are a few Animal based food sources that contain generous amounts of Niacin. An approximate serving size is shown, and the corresponding amount of this nutrient is shown as a daily percentage of the Recommended Intake for a woman of childbearing age.
Men might eat a little more to get the same % while children could eat a little less to get the same percentage of daily Niacin requirements. It is quite astounding to see the Niacin variation amongst the fish species.
Most of the Nutrient Data comes from the US Department of Agriculture (USDA), Agricultural Research Service, Nutrient Data Laboratory, September 2015.