Dietary Supplement. Zero Fat, Zero Carbs, Zero Lactose. Naturally and Artificially Flavored. ISO-100 has the highest Protein Percentage in its Class. 25g of protein of protein per serving/28 g serving size x 100 equals 90% Protein. Take the protein percentage challenge. You will be amazed how other protein powders numbers add up in this equation. Dymatize ISO-100 derives its name from its protein source, 100% Whey Protein Isolate. Unless you are in the medical profession, you have probably never seen protein like this before. Naturally occurring. Not added or manufactured. Gluten Free.