Whey Protein Isolate (WPI): The Lean Option
Isolate goes through extra filtering compared to whey concentrate, stripping out most of the lactose and fat so you're left with 90%+ pure protein per serve. If regular whey protein upsets your stomach, or you're watching calories closely, isolate is usually the better fit.
What We Stock
Switch Nutrition's WPI comes in Unflavoured, Vanilla Creme and Milk Chocolate at 900g. Protein Supplies Australia's WPI range covers Unflavoured, Vanilla, Chocolate, Strawberry, Banana and Choc Peanut Butter at 500g, plus a 360Whey WPI+WPC Combo if you want a middle ground between isolate and concentrate. California Gold Nutrition's Sport WPI is available unflavoured in 1lb and 5lb sizes if you're after bulk value.
WPI vs Whey Concentrate
Concentrate sits around 70-80% protein with more lactose and fat left in. Isolate is lighter, digests faster, and is the better call if you're lactose-sensitive or training close to a competition weight. If digestion isn't an issue for you, our broader protein powder range includes concentrate blends that are usually better value per gram.
Timing
Isolate's faster absorption makes it a solid post-workout choice, but there's no strict window you need to hit; getting your total daily protein in matters more than the exact timing.
