Niacin :- It is also known as anti pellagra vitamin. Deficiency of niacin is more prevalent in maize eating population. Pellagra is characterized by diarrhea, skin rash and mental deterioration with muscle weakness and loss of memory. Skin rash occurs predominantly in sun-exposed areas such as neck and back of hands leading to pigmented, scaly and cracked skin.

Niacin is present in adequate quantity in groundnuts, whole cereals, meat and fish. Diagnosis of pellagra is clinical and dramatic improvement is seen in symptoms on supplementation with niacin.

A genetic condition called as Hartnup's disease leads to a state of niacin dependency.