Protein mix - How long can it sit?
How long will a protein mix last before it isn't any good? Should I always mix it as soon as I want to drink it or can I pre mix a few bottles then store them in the fridge? I'm talking about using the tubs of powder, not actually buying the pre-mixed bottles like the 6 packs of Muscle Milk.
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When refrigerated, I would expect it to last at least 48 hours. If not refrigerated, I would suspect that you wouldn't want to leave it sit at room temperature for more than a few hours.
For lunch, you could try freezing it overnight and taking it out in the morning, then it should stay mostly cold until lunch time. Although, @Salsero69 's suggestion of measuring the powder then mixing when needed is probably the best solution.
I don't know the actual life of a mixed protein shake, but I wouldn't drink anything over 24 hours old. If you want convenience what I would do is pre-fill the bottles with the powder and fill with water or milk when needed. You will need to re-shake it anyway.
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