Post Workout Shake/Drink

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Hi all, just curious about opinions on Post Workout Shakes? I am currently doing the P90x3 (First time of doing anything thing of this nature), and using the P90x E & E pre-workout and p90x Recovery drink afterwords. Love the P90x but obviously we the end users pay for the marketing through the supplements and other "additional items". What have you tried and liked or should I stick with the P90X stuff? Running out need to make a decision pretty quick. Thanks for all your help.