Understanding Which Vitamin Deficiency Causes Sun Allergy (Pellagra) and Other Nutritional Factors
•
5 min read
While many assume sun allergies are only due to immune responses, a specific vitamin deficiency has long been linked to severe photosensitivity. Pellagra, the disease caused by a lack of niacin, or vitamin B3, often first presents with a characteristic sun-sensitive rash, providing a clear answer to **which vitamin deficiency causes sun allergy**.
