This subject is timely for me personally, as I am unable to eat enough protein. Just can't eat enough. Period. So this affects my protein intake.

For supplementation, I have both whey (MetRX PLus) and collagen (Premium Collagen Peptide Powder From Grass Fed Beef.) I can utilize more of the collagen because it has no bulk. Even added to coffee, there's no "thickening" feature so there's room in my stomach. Harder for me to consume the MetRX.