what is milk_shake incredible serum? milk_shake incredible serum is a fast-absorbing, lightweight serum that promotes an ideal scalp environment. Taking care of the scalp is essential to great looking hair as it creates the perfect environment for hair to grow and thrive. This magical serum absorbs quickly and cleanly, leaving your scalp in its best possible condition. In this powerful formula, our signature milk proteins and fruit extracts get a super-charged boost from additional targeted ingredients. Caffeine promotes scalp health while hyaluronic acid delivers intense hydration. Can be used daily, or as often as desired, before styling.