Some of us stock up on protein powder when it is on sale at the grocery store. Sure, it may be fast approaching its “best by” date, but that doesn’t mean anything, does it? Does whey protein go bad?
Most sources agree that whey protein is best used within two years. Many other sources believe it is best used in less than one year. Properly stored and kept dry, whey protein is safe to use indefinitely, though it will become less effective over time. It is not possible to define a time-frame for this, because so many different factors play a role.