E623 is a food additive known as calcium glutamate. It is primarily used as a flavor enhancer in various food products, similar to other additives like monosodium glutamate (MSG). E623 is derived from the amino acid glutamic acid and is often found in processed foods, snacks, and seasonings to improve taste. As a food additive, E623 is generally recognized as safe when consumed in moderate amounts. It is important for consumers to check food labels if they are sensitive to glutamates or have dietary restrictions. E623 is part of a broader category of flavor enhancers that includes other glutamates and amino acids.