What is the primary source of vitamin B3 in the diet?

Vitamin B3, also known as niacin, is primarily found in animal-based foods, particularly in meat and poultry. These food sources contain niacin in its active forms, which the body can readily use for various physiological functions, including energy metabolism and DNA repair.

While other food groups can contribute to dietary intake of vitamin B3, such as certain fish and nuts, the concentration and bioavailability of niacin in meat and poultry make them the most significant sources. Fruits, vegetables, and dairy typically do not provide sufficient amounts of vitamin B3, making them less reliable for meeting the recommended dietary intake. Therefore, including a variety of meats and poultry in the diet is essential for adequate vitamin B3 consumption.