Niacin acts as coenzyme in energy transfer reactions, especially the metabolism of glucose, fat, and alcohol.Niacin is similar to the riboflavin coenzymes in that it carries hydrogen molecules (and their electrons) during metabolic reactions.It also protects against neurological degeneration.

The primary sources of vitamin B3

Primary sources are offal (liver), fish, meat, milk, eggs, whole grain cereals, legumes, fruit (avocados, figs, dates, prunes), and nuts.
Other: Synthesized from tryptophan