Signature Clear Whey Isolate Signature Clear Whey Isolate is formulated with a new, cutting edge protein- Instant ProBev. This premium form of Whey Protein Isolate, is of the highest quality & highly bioavailable. Clear Whey Isolate is light, and crisp, with no milky taste or texture. It is more similar to the taste and texture of your favorite Pre-Workout or BCAA powder. Clear Whey Isolate has 20g protein per scoop with only 90 calories, and 1 carb.