All the benefits of live tubifex worms; free of parasite or harmful bacteria. Excellent treat for freshwater fish; turtles and some reptiles. Enriches with multi-vitamins to reduce stress and stress related illnesses. It quickly softens when put in water. Technologically advance freeze-drying process maintains original nutrition and flavor. Hikari Bio-Pure products never contain artificial colors or preservatives. After opening; keep the container out of direct sunlight; high heat and humidity; as this can cause the contents to degrade rapidly.