Vitamin B3 (Niacin) Deficiency and Excess
Niacin (Vitamin B3) imbalances in the body may present as symptoms of deficiency or excess. Niacin deficiency presents with glossitis, and severe deficiency is characterized by a clinical constellation of pellagra: dermatitis, dementia, and diarrhea. Severe deficiency is also often fatal. Vitamin B3 excess is rare, and presents with hyperglycemia (high blood sugar), hyperuricemia with symptoms of gout, and notably facial flushing responsive to aspirin.