When should I take protein shakes on rest days?

[Marwan]

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you do understand that there is nothing special about protein powder right? it should only be used as a convenience if preparing a whole food protein source isn't available...

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ya I understand that, I just like the convenience factor to get my daily requirement.. I ask because I've heard some saying before bed or in the morning are good times and those are the times where I probably won't have a lean protein source from food readily available.