From a health perspective, meat and dairy from pasture-raised cows are superior to their corn-fed cousins because of better fatty acid and micronutrient profiles.  However, protein powder, and whey protein in particular, has neither fat nor vitamins. As a result, one could argue — as some manufacturers do — that you don't need protein powder from grass-fed cattle to get the most health benefits. While I tend to agree with that assessment, I also consider the health of the animals and our environment, and I'm willing to pay extra for that. That's why I'd recommend using grass-fed products whenever possible.