Highlights & Basics
- Vitamin B3 deficiency is traditionally caused by consuming a diet mainly composed of corn and maize.
- Severe deficiency leads to pellagra, which is characterized by dermatitis, dementia, diarrhea, and eventually death.
- Lean meat, poultry, fish, and peanuts are rich in vitamin B3 (niacin); milk and eggs are rich sources of tryptophan, the precursor of niacin.
- Deficiency of vitamins B2 (riboflavin) and/or B6 (pyridoxine) reduces the synthesis of niacin from tryptophan and may lead to secondary vitamin B3 deficiency.
- Rare in developed countries, although there are still outbreaks in Africa, India, and China, particularly in refugees and displaced people.
Quick Reference
History & Exam
Key Factors
Other Factors
Diagnostics Tests
Treatment Options
Definition
Epidemiology
Etiology
Pathophysiology
Images
Typical dermatitis of pellagra on sun-exposed skin (extensor aspect of forearm and dorsum of hand) that is clearly demarcated from unexposed skin
Typical dermatitis of pellagra on sun-exposed skin (face and anterior neck) that is clearly demarcated from unexposed skin
Typical dermatitis of pellagra on sun-exposed skin (posterior neck and ear helices) that is clearly demarcated from unexposed skin
Citations
Janice LR, Kelly M. Krause and Mahan's Food and the Nutrition Care Process. 16th ed. St. Louis, MO: Elsevier; 2022.
Janos Z, John WS, Jesse FG III, et al. Handbook of vitamins. 5th ed. Boca Raton, FL: CRC Press; 2013.
Sauberlich HE. Laboratory tests for the assessment of nutritional status. 2nd ed. Boca Raton, FL: CRC Press; 1999:161-174.
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