Things to Note
Whey protein is chemically non-stimulatory, but may provide energy via means of caloric consumption and an insulin spike from the amino acids.
Unflavored whey protein tends to be described as having a "brothy, diacetyl, sourness, and/or bitter"[2] taste, hence why Whey is routinely flavored as supplements.[3]
This bitter taste, especially that of the hydrolyzed whey (very bitter) can be somewhat negated by sucralose, fructose, sucrose, 5'AMP, 5'AMP disodium, sodium acetate and monosodium glutamate (MSG).[4] Table salt is partially effective, while the combination of cold water and a sour stimuli can suppress bitterness[5]