Another killer session done and dusted? Make sure you look after your post workout recovery to maximise those gains.
Post workout recovery supplements are useful for:

• Muscle energy storage for your next workout
• Providing fast absorbing protein in order to repair muscle tissue
• Fighting lean muscle tissue breakdown (catabolism)
• A healthy immune system for handling stress from exercise

Rest and good nutrition are equally important directly after a workout session. Rest is the easy one, post workout nutrition, not so much.

Immediately after your workout is the prime time to get nutrients to your muscles for repairing and rebuilding. Don't deny your bodies gains by not feeding your body good nutrients after a hard workout.
Whey protein comes in various forms, but in general, a fast absorbing protein, such as WPI, that is most useful as a post workout protein.

Whey is fast, effective, and incredibly convenient. You can find powders that are lean or carb and calorie dense, making it great for cutting or bulking alike.