When customizing you are supposed to give certain %'s of what you want. Well, how do you know the nutrional value at the end??? like how much protein, carbs, cals, etc. per serving??
Look at the nutritional values of each protein and supplements. You can add carbs, fats etc. You will need to give them a percentage of ingredients. Call them if you need any help with a formulation. I love my costom mixes from the PF.
They have a post workout formula or you can customize your own. Check out the different ingredients and see what suits your needs. Call The PF during business hours and they can help you and answer your questions. Email me for more help.
Incase you didn't know protein factory does have a calculator where you can put in the % of ingredients and it will display all the nutritional info you need, and the price per lb. its at: