Sea Moss is supremely preserved using a combination of sunlight and moon light to keep it balanced and potent. It will remain unspoiled as long as it isn't subjected to conditions that cause it to spoil. Keep it stored in a glass or plastic container well sealed and out of the sun and moist, dark damp areas where microbes flourish. We have tested a batch in only a ziplock bag stored in an open indoor space for 4 years with no spoilage what so ever.