I'm looking for a basic vanilla protein powder, but honestly don't know where to begin. Which supplement is best? I am training for a 5k, so I do a lot of walking/jogging/running, I also do weight training, cycling, tennis, and swimming. For hardcore workouts I want something that will refuel my body and keep me from getting injuries. I've heard different things about soy, artificial flavors, etc. and I just want to know what is my best bet?