For over 80 years, the Orthodox Union (OU) has maintained the highest standard of kosher supervision, granting OU Kosher Certification to only those that meet their standards. The OU's kosher supervision label appears on over 500,000 products manufactured in 83 countries, making the OU the world leader in kosher certification. One of the best known businesses that have been certified is Richardson Brands Co. with the Beechies chewing gum.

Source: oukosher.org