Whey Isolate
Whey protein isolate (WPI) is whey that has been filtered further than concentrate, reaching 90 percent or more protein content by weight. Very little lactose, fat or carb remains. WPI is the premium whey format: low calorie, fast digesting and easier on sensitive stomachs.
Why It Matters
Isolate makes sense when you want maximum protein with the lowest possible carb and fat content, or when whey concentrate gives you bloating or gas. The trade-off is price: a quality isolate runs 30 to 50 percent more per gram of protein than the cheapest concentrate.
How to Spot It on a Label
The label should say isolate, WPI, or 90 percent protein. The cleanest isolates have a single ingredient line ('whey protein isolate') with no concentrate, no maltodextrin and no protein boosters. ISO100, Isopure and Sports Research are well-known examples.
Examples from real products
Related Terms
Keep learning with these closely-linked entries: