I'm a user of SIS Rego (a protein recovery drink)... have tried the chocolate and strawberry flavours but prefer the strawberry one. It appears to help with my recovery (though of course it cuold just be psychological). I have also used creatine from Holland & Barrett in the past, but I can't say I noticed any difference with that, but I have faith in science and i'm sure it was helping in some way or another!
I would certainly recommend a supplement drink though, your body needs all the nutrients it can get to recover from your runs and from what I'm sure I've read, if there's insufficient energy/protein/whatever taken on board the body starts to burn muscle? Surely not ideal!