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No there's no real need (if by "workout" you mean lifting weights). I do sometimes take a whey shake with me, but water is enough. I have plenty of energy to last for my ass-kicking 30-40 minutes, and I don't want to interfere with my protein/insulin spike right after the workout. Generally, you don't want to have too much insulin going during a workout, but right after.
However, for hard gainers, it is recommended to plan pre-workout and post-workout nutrition.
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