Can't eat. Dried seaweed is generally not recommended for 5 years. Dried seaweed is low in calories and can be used as diet food. Dried seaweed can improve human immunity and antiviral ability. Dried seaweed can also reduce the lipid content in blood vessels of atherosclerosis and cardiovascular and cerebrovascular diseases. If dried seaweed is stored in a cool, ventilated and dry place, it can be kept for about 12 months without being affected by unfavorable factors such as high temperature and high humidity.