Mussels are high in B12 vitamins and provide a readily absorbed source of many other B & C vitamins, amino acids, vital minerals including iron, manganese, phosphorus, potassium, selenium and zinc. They are also a good source of taurine. They are a superfood that helps fill in any gaps missing in most dogs' diets. These are freeze dried and packaged in bags of 28. Freeze drying preserves over 90% of the nutrition in the mussel meat and makes them shelf stable for storage.