Understanding Kosher Certification Symbols: OU, OK, and Beyond

Kosher certification symbols, also known as hechshers, are a vital part of ensuring that food products and establishments adhere to Jewish dietary laws (kashrut). With kosher foods being a growing market worth tens of billions of dollars, these symbols, found on packaging or restaurant certificates, signify that the product or facility has been inspected and approved by a kosher certifying agency. Here’s a guide to some of the most common and stringent kosher certification symbols, including lesser-known ones and regional certifications.

Major Kosher Certification Symbols

OU (Orthodox Union)

• Symbol: A “U” inside a circle.
• Based out of Manhattan, the OU is one of the most widely recognized kosher certifiers globally. Its certifications include:
  • OU: Pareve (neither meat nor dairy).
  • OU-D: Dairy products or those made on dairy equipment.
  • OU-P: Kosher for Passover.
  • OU-Meat: Products containing meat or made on meat equipment.
• The OU is known for its rigorous standards and broad acceptance across Jewish communities.

The OU certifies thousands of products, and most recently, they announced they are certifying the famous YouTuber Mr. Beast’s line of Feastibles.

---

It’s happening! Mr. Beast Feastables are becoming OU Kosher certified! 🎉🍫

DISCLAIMER: Not all stores have the OU Kosher certified products yet. ALWAYS check for the OU symbol on the packaging before you buy!

Mr. Beast Feastables are kosher only if they have the OU Kosher… pic.twitter.com/tkS6UkfEWg

— OU Kosher (@OUKosher) February 18, 2025

---

OK Kosher

• Symbol: A “K” inside a circle.
• Known for its global reach but based out of Brooklyn, New York, OK Kosher certifies thousands of products, ensuring compliance with kosher laws. Its designations include:
  • OK Pareve: Neutral (neither meat nor dairy).
  • OK-D: Dairy.
  • OK-P: Kosher for Passover.
  • OK-DE: Made on dairy equipment but does not contain dairy ingredients.

KOF-K

• Symbol: The letters “KOF-K.”
• Recognized internationally and based out of New Jersey, the KOF-K is known for its high standards in food production, including ingredients, flavors, and even pharmaceuticals. It is trusted by Orthodox Jewish communities worldwide.

Star-K

• Symbol: A star inside a circle with a “K.”
• Based in Baltimore, Star-K certifies a wide range of products and establishments. Its sub-certifications include:
  • Star-D: Dairy products that are not Cholov Yisroel (milk supervised by an observant Jew).
  • Star-S: Kosher for Passover with kitniyot (legumes permitted for Sephardic Jews).

Other Stringent Certification Symbols

1. CRC (Chicago Rabbinical Council)
   • Symbol: “CRC” inside a triangle.
   • Chicago-based, the CRC is highly regarded in North America for its strict adherence to kosher laws. It certifies food production plants, retail establishments, and restaurants.
2. MK (Montreal Kosher)
   • Symbol: “MK.”
   • Headquartered in Montreal, the MK Canadian certification agency is well-respected for its stringent standards and is particularly prominent in Canada.
3. Badatz Certifications
   • Various symbols represent ultra-Orthodox (Haredi) communities.
   • Badatz agencies often cater to stricter dietary observances and are highly regarded among more stringent kosher consumers.

Regional and Local Certifications

While the above symbols are widely recognized internationally, many regions have their own kosher certifying agencies:

• In the U.S., states like New York, California, and Florida host numerous local agencies that cater to community-specific needs.
• Restaurants often display certificates issued by local rabbinical authorities rather than national agencies. These certifications are typically tailored to the establishment’s operations but may not be as widely recognized outside the local community.

Understanding Accompanying Letters

Kosher symbols often include additional letters to clarify the product’s status:

• D: Dairy.
• DE: Made on dairy equipment.
• M: Meat or made on meat equipment.
• P: Kosher for Passover.
• F: Contains fish ingredients.

Why So Many Symbols?

The diversity of kosher certification agencies reflects varying interpretations of Jewish law (halacha) and different levels of stringency. Consumers often choose products based on their trust in specific agencies or their community’s standards.

Small Symbols With Much Meaning

Kosher certification symbols provide clarity and assurance to consumers observing Jewish dietary laws. While major agencies like OU, OK, KOF-K, and Star-K dominate the market with their global reach and stringent standards, smaller regional certifiers play an essential role in local communities. Whether you’re shopping for groceries or dining out, these symbols help a segment of the market to make purchases while knowing their religious dietary restrictions are respected.