Whey concentrate and isolate are both derived from milk, but they differ in their protein content, processing, and nutritional profile. Whey concentrate contains 70-80% protein with some lactose (milk sugar) and fat, offering a balanced blend of nutrients. It's less processed, resulting in a richer flavour. Whey isolate, on the other hand, is more heavily processed to remove almost all lactose and fat, boasting a higher protein content of around 90-95%. This makes isolate a better option for those with lactose intolerance or for individuals seeking a lower-calorie, higher-protein option.