I might be wrong but, I thought is was mainly bypassers that lose their hair due to the malabsorption.
However whilst you are still really restricted I'm sure protein shakes can't hurt.
I personally have tried loads of different brands and hated them all. I now have Fortimel Regular as it is low fat, not too bad for sugar (as long as I don't drink it in one go!) has 20 grams of protein in it and tastes good.
I know that other people have also used slimfast shakes. I guess as long as its low fat, doesn't contain too much sugar, it doesn't have to be a traditional protein shake.
Be interesting to hear what others have to say, as this is one area that has taken me months to sort out.
Julie xx