Protein
Whey Isolate vs Whey Concentrate: What Actually Differs
28 August 2026 · 6 min read
Whey protein concentrate (WPC) and whey protein isolate (WPI) both come from the liquid whey left over during cheese making. The difference is how far the filtration process is taken.
WPC typically sits between 70% and 80% protein by weight, retaining more lactose, fat and naturally occurring milk compounds. WPI is filtered further, generally landing at 88–92% protein with substantially less lactose per serve.
In practice, that means WPI suits people who notice digestive discomfort with dairy, or who are tracking macronutrients closely and want more protein for fewer kilojoules. WPC is usually the better value per gram of protein and mixes into a creamier shake.
Neither is inherently 'better'. Total daily protein intake across whole foods and supplements matters far more than which filtration grade you choose. Supplements may only be of assistance if your dietary intake is inadequate.
If you are unsure which suits you, start with a smaller tub, check the nutrition information panel for protein per serve rather than per 100g, and always read the label before use.
This article is general information only and is not medical advice, diagnosis or treatment. Supplements should not replace a balanced diet. Always read the label and follow the directions for use. Speak with your doctor or pharmacist before starting a new supplement, particularly if you are pregnant, breastfeeding, taking medication or managing a health condition.