25.7 MB (2.5 MB compressed)
2408 x 3729 pixels
20.3 x 31.5 cm ⏐ 8.0 x 12.4 in (300dpi)
DR M.A. ANSARY / SCIENCE PHOTO LIBRARY DR M.A. ANSARY / SCIENCE PHOTO LIBRARY
Vitamin B3 deficiency. Cracked and inflamed skin of a man, a symptom that his diet is deficient in vitamin B3, a disorder that is known as pellagra. Other pellagra symptoms are an upset digestive system, diarrhoea and depression. 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. Good sources of vitamin B3 are liver meat, groundnuts and seeds from the sunflower plant. Photographed in Africa.
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