Yes, freeze-drying is a safe way to preserve breast milk. Freeze-drying has been used by human milk donor banks since the 1950s to preserve and store human milk in a better way. Freeze-drying is a very gentle process, which ensures maximum nutrient retention. With freeze-drying, absolutely NO chemicals, additives, or preservatives are added to your milk. Milkify operates the only GMP-certified facility dedicated exclusively to the freeze-drying of breast milk in North America. Additionally, Milkify's patent-pending process is unique in that we never touch your milk (no utensils and no equipment will ever come in contact with your milk). In addition, all operations at Milkify are performed in sterile ISO5 cleanroom workstations to prevent the introduction of contamination (bacteria, chemicals, etc) into your milk. Milkify follows all safe handling guidelines set forth by the Centers for Disease Control (CDC) and the Human Milk Banking Association of North America (HMBANA), and complies with the packaging regulations for infant food set forth by the U.S. Food and Drug Administration (FDA). In addition, Milkify's own robust set of Quality Control procedures regulate our processes, facilities, equipment, personnel, and packaging in order to assure consistent quality and safety of our service. Our facility is regularly inspected and our entire operation has been audited for GMP-compliance by independent third-party experts. See more about our quality assurance measures here.