Pea protein powder can last up to 2 years when stored in a cool, dry place. To maintain its freshness and potency, it's best to store pea protein powder in an airtight container, away from light and moisture. Refrigeration is not necessary or recommended. Storing in a refrigerator can cause condensation to form which can cause your protein powder to spoil. To ensure that your pea protein powder is still good to use, look for any signs of discoloration or an off odor or taste. If you have any concerns, it's best to discard the powder and purchase a new batch.