ISO-XP ISO 100% Whey Protein Isolate is a rich protein supplement with a sweetener and the highest quality whey protein isolate. ISO-XP is made from very fresh European whey and then spray dried. ISO-XP has no added SOY and instead uses sunflower lecithin as an emulsifier. ISO-XP is ideal for anyone looking to increase their daily protein intake without any added fats, carbs or sugars. ISO-XP should be mixed with water or skimmed milk for easy and delicious mixing.