The perfect addition to any weight loss plan High protein, low sugar Peanut Butter flavour USN Diet Whey Isolean contains 25g of protein and only 1.5g of carbohydrates per serving, ensuring the perfect ratio for healthy weight loss and maintenance of lean muscle. USN Diet Whey Isolean contains a variety of important vitamins and minerals making it a healthy supplement alongside a balanced diet. High levels of fibre keep you satisfied for longer and prevent unhealthy snacking during the day.