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Pellagra due to niacin deficiency. Elderly man suffering with a rash due to pellagra, a condition caused by niacin deficiency. Cracked and inflamed skin is one symptom of this condition. Vitamin B3 exists in two forms: niacinamide and niacin. One of the complex of B vitamins, it takes part in many metabolic reactions and, like other vitamins, is needed only in small amounts, but is an essential part of a healthy diet. Photographed in India.
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