I wouldn't do anything but the approved stuff on Atkins induction list.

I also wouldn't use a protein shake for a meal. HOWEVER, if you work out or for one of your snacks, after your induction period, a shake won't hurt you. I work out and drink one as soon as I get home from working out. It just gives me a boost of protein to start healing the muscles in my body I have worked out that day.

If you do decide to do Designer Whey, I would recommend trying to find the Carb Countdown milk to mix it with. It gives it a creamier and better taste. It has a few more carbs than water. But, worth it