Biotin

Biotin (biotinum; synonym: vitamin N) – the water-soluble vitamin coming to an organism with food and synthesized by intestinal microflora; takes part in biosynthesis of sterols and acids; at deficit of biotin emergence of anemia and a dermatosis is noted.

 
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Was considered earlier that yawning enriches an organism with oxygen. However this opinion was disproved. Scientists proved that yawning, the person cools a brain and improves its working capacity.