Well, where is he getting this? If you aren't buying it, then he is. And you should know where this stuff is coming from.
Go to a health store and buy whey protein powder. You can get a big bag of it. Then look up the Vitamix website and click on their smoothie recipes. Add a scoop of the protein powder to the smoothies. You can also add plain yogurt to the recipe - that gives more smoothness. Make sure you put enough sweetness in it that he likes the taste - if you don't want sugar, use another sweetener. I'd like to say Agave, because a lot of people like it, but I found that I couldn't stand the taste :(
Really and truly, find out where he's getting the powder and what it is. You really want to know this.