Powders & loose teas
Should be refrigerated after opening for longest freshness and potency. 

Tinctures & capsules
Do not need to be refrigerated but should be stored in a cool, dark location (out of direct light). 

This will ensure longest freshness and potency.  Date reflected on the bottom of the bottle is the standard "expiration" date.  If stored properly these products will last far beyond the recommended expiration date.