As the world’s largest kosher certification agency, OU Kosher certifies over 1.2 million products in 104 countries. The OU began certifying kosher products in 1923 and is now the most recognized and most trusted kosher symbol amongst kosher consumers worldwide. In addition to certification services, OU Kosher offers resources to its certified customers that include sourcing ingredients as well as marketing and promotional support for business-to-business services and consumer brands.