How Long Does Whey Protein Last For? We Take A Look At The Shelf Life of That Cannister of Whey Protein Dear Fitness Nerd, I have a quick question about the shelf life of whey protein powder.  My ex boyfriend left a 5lb tub of Optimum Nutrition 100% whey protein powder in our apartment, but I can’t seem to find an expiration date on it.

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How Long Will Whey Keep? | Ask The Fitness Nerd