The Orthodox Union (OU) 
The Orthodox Union, or more commonly known as the OU, is one of the oldest Orthodox Jewish organizations in the United States. Founded In 1898, It is best known for its kosher supervision service, with the 'Circled-U' symbol found on the labels of many commercial and consumer food products. The OU is a well-known and highly respected organization, which certifies over 250,000 products worldwide.
KHAL ADAS JESHURUN (KAJ) 
As a prominent administrator for the KAJ, Rabbi Moshe Zvi Edelstein was instrumental in emphasizing the importance of a commitment to the "reliability of kashrus." The KAJ has been in the Kashrus certification business for over 20 years and currently certifies over 40 companies nationwide. Brands covered by the KAJ include, but are not limited to, Rubashkin (Aaron's Best) and Empire.
The Nirbator Rav 
As a well respected and prominent Rabbi, the Nirbator Rav's, hashgachot are the symbol of the highest standards of kashrus. The Nirbator Rav, also known as Rav Teitelbaum, provides certification to all Meal Mart products. Products from their central kitchen are all made with Yoshon. The “Nikkur” or cleaning of "Chelev" on every piece of meat is done under the watchful eye of Mashgichim Mumchim, or in the "Nikkur" process, those who are "Yirei Hashem". They have learned their trade from other “Minak’rim Mumchim”, who have received Kaballah Nikkur, or the permission to perform the acts of slaughtering in accordance with these rules, from Rabbonim and Geonim (ZY”A) from the previous generation.
Montreal Vaad Ha'ir (MK) 
The Jewish Community Council of Montreal was established in the year 1922, when a group of concerned individuals gathered together to address the needs of the Jewish community of Montreal. Since then, the council has established itself as the leading players responsible for the certification of Kosher food products bearing the MK certification mark, the Beth Din of Montreal (Jewish ecclesiastical court), the Ruth Institute (conversion program), and any other aspect pertaining to Jewish life in Montreal.
Central Rabbinical Congress (CRC) 
The Central Rabbinical Congress, or more commonly known as the CRC (in Hebrew: Hisachdus HaRabbonim DeArtzos HaBris VeCanada התאחדות הרבנים) is a rabbinical organization which provides kosher food certification for thousands of well known products. The esteemed Rabbi Yidel Gruber ensures that All products under the strict rabbinical supervision of The Central Rabbinical Congress of The USA and Canada maintain the highest standards of Kashrus.


