The shelf life of beef protein powder varies depending on the manufacturer, but it typically lasts between 12-24 months if stored in a cool, dry place away from direct sunlight. To extend its shelf life, it is best to store it in an airtight container or resealable plastic bag. The best way to determine if the powder is still good is to check for any noticeable changes in color, odor or texture, or if there is any visible mold or clumping. If in doubt, it's best to discard the powder and purchase a fresh batch.