SpectrumNeeds has a “shelf life” or expiration date of 2 years and is located on the bottom of each container.  However, once opened by breaking the vacuum seal lid, SpectrumNeeds is designed to stay fresh for up to 90 days after opening and using the product. Once opened, store SpectrumNeeds in a cool dry place and keep SpectrumNeeds away from warm, humid environments to help ensure effectiveness for longer periods after opening.  Crystalline substances, including vitamin C, B vitamins, and other dietary supplements, are prone to a process called deliquescence, in which humidity causes a water-soluble solid to dissolve, which may result in clumping.  Although safe, high humidity and extended periods of heat could be degrading the dietary supplement (SpectrumNeeds) after opening the sealed container.