If you was thinking about a weight gaining - don't use overpriced maximuscle products.
A good quality whey protein, can be had from sites like myprotein.co.uk and affordablesupplements, which is much cheaper and will help you build you up.
I had a bust jaw after a row a couple of years ago(wired 6 weeks 2 plates 4 pins),my advice is get a load of them meal in a can jobs,about a pound ago they come in coc,straw,vannila flava and they all taste crap but do the job m8.