Research on thermically accelerated decomposition of DCA created for oral use showed that half-life in 4°C is a period of about 5 years. It drops to 156 days if the temperature rises to 25°C. The stability of DCA was also watched for a year. It was kept in 4°C. It proved to be stable for the whole year and therefore 1 year is presently the recommended time of storage.
You should keep DCA tightly sealed in the original bottle and store it in the freezer. DCA absorbs water extremely fast and open air exposure in humid environments should be minimized.
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