Processed reishi has a shelf life of two years; unprocessed reishi has no specified shelf life. You should check the instruction manual for details. Ganoderma lucidum is the dried fruiting body of purple or red ganoderma lucidum, which is effective in relieving cough and asthma (stopping cough and calming wheezing), tonifying the qi and tranquilizing the mind, and can be used to treat symptoms such as palpitations, coughing, insomnia, and restlessness of the heart and mind. The shelf life of unprocessed reishi after harvesting is generally unspecified, but if it is processed, the shelf life of reishi is generally specified as two years. Although there is no prescribed shelf life for unprocessed ganoderma lucidum, it is important to observe the condition of the herb before judging whether it can be used, such as whether it has been corroded by insects or has a musty odor. Reishi should be kept in a cool, dry place, away from direct sunlight. The adverse effects of Ganoderma lucidum are not known and it is recommended that people who are allergic to Ganoderma lucidum should not consume it. The use of the drug is recommended under the supervision of a doctor.