I'm not a fan of most protein powders on the market, simply because many contain inferior sources of protein along with artificial sweeteners and flavors. (articles.mercola.com)
It is an inexpensive but inferior source of essential amino acids which can add to the total protein content of the dog food formula. (dogfoodchat.com)
For the most part, the film looks true to its seamy quality, and at any rate, the unrated version looks vastly superior to the material that fills in the included director's cut, all of which was clearly gathered from inferior sources. (slantmagazine.com)