Aye, don't suppose it will do much harm, you'll probably just pee it out. From experience though, it's rare for anyone doing cardio/endurance stuff to need protein from an external source providing you have a decent diet.
I'm no runner so it might be different, most of the stuff I've read (and from experience) with cycling is that carbs are what you need before/during your training. So have slow release carbs beforehand, then try and have some faster releasing carbs afterwards with a little bit of protein in. A humble chocolate milkshake is quite popular amongst cyclists for post training.
I can't recommend this book highly enough. It's got some cracking recipes designed for endurance athletes.
http://www.amazon.co.uk/Go-Faster-F...9326/ref=sr_1_1?ie=UTF8&qid=1390928501&sr=8-1
It has a good mix of pre and post training meals, breakfasts, snacks, desserts and of course main meals. Wouldn't recommend it all the time like as it's not all that cheap, but there's a Duck, Orange and Cardamon Pilaf recipe for instance that has 100g of carbs and 50g of protein per portion.
The recipe serves 4 people so if you're doing it just for yourself, make it up, freeze three portions and you've got a cracking meal there to whack in the microwave whilst you have a shower etc.