The effectiveness of expired protein powder may decrease over time. The protein content, taste, and texture can deteriorate, but it may still be okay to consume if it has been stored properly. However, it is recommended to check for signs of spoilage or an off odor or flavor, which may indicate that the powder has gone bad and should be discarded.
It is always best to follow the expiration date on the product label and to store protein powder in a cool, dry place to maintain its quality and effectiveness. If in doubt, it is best to err on the side of caution and replace the expired powder with a fresh batch.
We recommend replacing expired protein for both health and safety reasons, but also due to the loss of product effectiveness.