Hematogen (Latin: Haematogenum; Greek: Αιματογόνο, aimatogóno) is a nutrition bar which is notable in that one of its main ingredients is black food albumin, a technical term for cow's blood.^[1] Other ingredients may vary, but they usually contain sugar, condensed milk and vanillin.

It is often considered to be a medicinal product, and is used to treat or prevent low blood levels of iron and vitamin B12 (e.g., for anemia or during pregnancy).^[2]