So, how long does protein powder last once opened? Unfortunately protein powder does eventually expire, but it does last a long time.

We would not recommend using protein powder after it's expiration date, as protein efficiency is compromised after this date.

Yes, whey protein powder does lose its protein efficiency and expire, but it lasts a good long while when stored correctly.

Yes, all protein powder can expire and spoil, but they do last a good long time first.

All protein powder loses its efficiency and can spoil over time, but in general egg protein powder lasts for a long time.

All protein powders degrade over time and beef protein powder is no different.

The shelf life of whey protein powder can be as high as two years if stored correctly.