Our products have a 3 year shelf life from date of manufacture when stored in normal temperature appropriate environments (x-x degrees). In addition, most products have a 6-12 month period after opening life. Look for the PAO featured on every package with the expected # of months. Although our products are tested to withstand a wide range of temperature from hot to cold for longevity they should be stored in a temperature controlled environment when possible. Some extreme environments may cause products to melt or freeze.