Livestrong.com says:
Unopened
According to Honeyville Farms, an unopened box or can of vital wheat gluten will remain usable for seven to 10 years as long as it is stored away from bright light and extreme temperatures. Vital wheat gluten does not contain any preservatives, but an unopened package has few opportunities to become contaminated or rancid and will remain fresh until some months after it’s been opened.
Opened
Vital wheat gluten that has been opened does pose a very small risk of becoming rancid. However, an item’s fat content is usually proportional to the odds that it may go rancid, and according to KingArthurFlour.com, vital wheat gluten is completely fat-free. The product’s instructions don’t call for storage in the refrigerator or freezer, although storing the powder in such a cool place may extend the shelf life of an opened package to the seven or 10 years it can survive unopened. At room temperature or in the refrigerator, the powder is likely to remain usable for at least a year or two.
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Unopened
According to Honeyville Farms, an unopened box or can of vital wheat gluten will remain usable for seven to 10 years as long as it is stored away from bright light and extreme temperatures. Vital wheat gluten does not contain any preservatives, but an unopened package has few opportunities to become contaminated or rancid and will remain fresh until some months after it’s been opened.
Opened
Vital wheat gluten that has been opened does pose a very small risk of becoming rancid. However, an item’s fat content is usually proportional to the odds that it may go rancid, and according to KingArthurFlour.com, vital wheat gluten is completely fat-free. The product’s instructions don’t call for storage in the refrigerator or freezer, although storing the powder in such a cool place may extend the shelf life of an opened package to the seven or 10 years it can survive unopened. At room temperature or in the refrigerator, the powder is likely to remain usable for at least a year or two.