Each kosher certification agency has its own symbol, which you may have noticed on food packages. The symbols are registered trademarks and cannot be placed on a food label without the organization’s authorization. The letter “K” by itself is generally an unreliable identifying mark, since it often has no Rabbi or certifying organization backing up the company’s claim to kosher status. A majority of all prepackaged foods today have some kind of kosher certification, and most major brands have reliable Orthodox certification.
It is interesting to note, a significant sector of the market for kosher products is composed of people who are not interested in the kosher aspect at all. Kosher certification is a buying card for many Muslims, Seventh Day Adventists and vegetarians. People who are allergic to grain products stock up each year on the grain-free Kosher for Passover products available. In addition, many people prefer kosher products because they believe them to be cleaner, healthier or better than their non-kosher counterparts.