Niacin is an essential substance for animal growth and development. Niacin in cereal feed mainly exists in a bound form, which is difficult for animals to absorb. Therefore, synthetic niacin needs to be artificially added to the feed. Adding an appropriate amount of niacin to the feed and feeding piglets (chickens) can quickly increase their weight. Feeding laying hens with niacin based feed can increase their egg production rate and also increase the nutritional value of eggs containing a certain amount of niacin Niacin is involved in the body's lipid metabolism, oxidation process, and anaerobic decomposition process. Niacin can be generated by the conversion of tryptophan in the body, and the human body is generally less prone to niacin deficiency. However, when the staple food does not contain niacin or there are substances in the staple food that break down niacin, it can easily lead to rough skin disease caused by the lack of niacin.