The Ecology of Humans (46-2-3) Vitamin B3

 B₃

Vitamin B₃ (C₆NH₅O₂; aka niacin) is an essential nutrient – but in a sense, is not really a vitamin at all, as B₃ need not be in the diet. Niacin can be manufactured from the essential amino acid tryptophan (C₁₁H₁₂N₂O₂). Niacin is found in a variety of foods, including whole grains, legumes, nuts, avocados, and fish.