Verdict
Per 30 g scoop, isolate delivers 27 g of protein vs 24 g from concentrate, with fewer calories (111 vs 120 kcal), fewer carbs (0.3 g vs 1.8 g) and less fat (0.3 g vs 1.8 g). On paper it wins everything — but the gap is about 3 g of protein per scoop. For most people, concentrate does the job; isolate is really worth it if you're lactose intolerant, since it has far less milk sugar.
When to choose Whey concentrate
- You want the best cost per gram of protein.
- Lactose isn't a problem for you.
When to choose Whey isolate
- You're lactose intolerant or concentrate bothers your stomach.
- Your diet is dialed in and every gram of carbs and fat counts.
Values per 100 g of ready-to-eat food, from the Brazilian Food Composition Table (TACO) and USDA FoodData Central. They vary by brand, cut and preparation. Educational estimates, not individual nutrition advice.