We highly recommend storing and using the Orgain protein powder by the Best By Date on the bottom of the canister. If the protein powder has been stored in a cool, dry place the product will have a shelf life through the date on the bottom of the canister, whether open or unopened.
If the protein powder develops a foul smell, begins to look discolored, or starts to clump, these are indications the protein powder is spoiled and should be discarded.