Vitamin B1 crystals, light micrograph

Vitamin B1 crystals, light micrograph

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Credit: DAVID PARKER/SCIENCE PHOTO LIBRARY

Caption: Vitamin B1 crystals, polarised light micrograph. Vitamin B1, also called thiamine, is an essential nutrient that humans are unable to produce and so need to obtain from their diet. It is found in flour, beans, pork and salmon. Vitamin B1 is important for the normal function of the heart, muscles and nervous system, as well as normal growth and development. Deficiency can lead to the disease beriberi, which causes weight loss, emotional disturbances, and limb pain and weakness.

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