Hydrolyzed whey can absorb a little faster than whey isolate, but trials found the same muscle and strength gains. See how each is made, what the studies show, and who should pay more.

Whey isolate is usually fine for lactose intolerance in normal servings. Learn how to read a whey label for lactose, how much most people handle, and why a milk allergy is different.

Whey isolate costs more and gives you less powder. Here is what the extra filtering removes, when it is worth the price, and when regular whey is the smarter buy.