Biotin (vitamin H)
It was revealed that egg yolk could prevent dermatitis and emaciation in rats that were kept on raw egg white a$ the main protein source. The factor of the egg yolk was called as anti egg white injury factor. Szent Gyorgyi, in 193 1, first recognized it as a vitamin and named the factor as vitamin H The vitamin was subsequently isolated in 1939 by Gyorgyi, Kuhn and Lederer.