Muscle Milk Pro Series Knockout Chocolate: Nutrition & Labelgrade B+ (80/100)

The short answer

Muscle Milk Pro Series Knockout Chocolate delivers 32 g of protein for 210 calories in a 2-scoop (53 g) serving — about 60 g of protein per 100 g of powder, with 61% of the calories coming from protein. That is a genuinely high-dose, lean scoop, and it’s why the protein-density dimension is maxed out. It earns a B+ (80/100). The first ingredient is milk protein isolate, but the second is caseinate, so this is a casein-led milk + whey blend — not a pure isolate — and it carries 12 g of carbs from maltodextrin. The one thing keeping it out of the A range is the ingredient panel: a non-dairy creamer system and two artificial sweeteners (sucralose, acesulfame potassium) read processed.

Why the B+

The fiber “D” and the protein “A+” are pulling in opposite directions, and the A+ wins because this is a protein supplement, not a fiber source. The honest knock is ingredient quality at C+: the protein chemistry is sound, but the formula reaches for a creamer and synthetic sweeteners to hit a creamy, sweet chocolate shake, where the cleanest powders on the market do neither.

The blend, not just the number

The 32 g headline hides the more interesting story, which is what kind of protein. Read the label in order: milk protein isolate, then calcium sodium caseinate, then whey concentrate — with whey isolate and whey hydrolysate further down in the under-1% block. Casein sits ahead of every whey source, so by mass this leans casein.

That has a practical consequence a pure-whey scoop doesn’t share. Casein digests slowly and whey digests fast, so a casein-led blend releases amino acids over a longer window rather than spiking and clearing. For an overnight shake or a meal-replacement gap between training and the next real meal, that slower curve is arguably a feature. For the narrow 30-minute post-lift window where pure-whey isolates are the textbook pick, an isolate edges it. Same 32 g on the front; different behavior once it’s down.

The carbs are the tell

A pure whey isolate at this protein level usually carries 2-4 g of carbs. This carries 12 g, and they aren’t sugar — sugar is a trace 2 g of lactose. The carbs are maltodextrin, sitting third on the ingredient list ahead of the cocoa. Maltodextrin is a cheap, fast-digesting carbohydrate that doubles as a bulking and mixing agent, and its high placement is the single clearest signal that this is a blend-and-fill formula rather than a stripped isolate. It isn’t a red flag — those carbs are real fuel, and post-workout some people want them — but it’s the honest line between this powder and a “nothing but protein” tub, and it’s most of why the ingredient grade is a C+ rather than a B.

What the long ingredient list actually is

The panel runs to roughly 42 items, which looks alarming until you sort it. About 30 of those are the fortification pack: 400 mg of calcium (30% DV), 3.6 g of iron, 520 mg of potassium, and a near-complete B-vitamin run plus vitamins A and D. Those aren’t filler — they’re why a single scoop doubles as a multivitamin-grade micronutrient hit, which a plain isolate won’t give you.

Strip the vitamins and minerals out and the list that’s left is short and ordinary: the protein sources, cocoa, the non-dairy creamer (sunflower oil and maltodextrin on a caseinate base, with mono- and diglycerides to emulsify), natural and artificial flavors, soy lecithin, and the two sweeteners. The creamer and the sweeteners are the real processed-food markers here — not the long micronutrient tail.

Who it’s for

This is the scoop for someone who wants a big, lean protein dose that mixes into a thick chocolate shake and brings a vitamin load along for free — a recovery or meal-gap shake for hard-training or bulking schedules where 32 g in one serving beats stacking two scoops of a leaner powder. Two shoppers should look elsewhere: anyone avoiding artificial sweeteners (this is built on sucralose and ace-K), and anyone who wants the shortest possible ingredient list for a tight post-workout window, who is better served by a pure whey isolate like Ascent or Dymatize ISO100. The serving-size caveat matters too: USDA defines this serving as 32 g of protein, but the larger retail tubs market a 2-scoop serving as 50 g using a bigger scoop, so check the tub you actually buy.

Ingredients

Milk protein isolate, calcium sodium caseinate (milk), maltodextrin, alkalized cocoa powder, whey protein concentrate (milk), and a non-dairy creamer (sunflower oil, maltodextrin, sodium caseinate, mono- and diglycerides, tocopherols) make up the bulk, followed by natural and artificial flavors. The under-1% block adds more protein fractions (whey isolate, whey hydrolysate, lactoferrin), the sweeteners (acesulfame potassium, sucralose), texture and fiber aids (MCTs, inulin, soluble corn fiber, canola oil, soy lecithin), and the full vitamin-and-mineral fortification pack. Contains milk and soy (soy lecithin). (Verbatim list below, from USDA Branded Foods FDC 2114497.)

Milk protein isolate, calcium sodium caseinate (milk), maltodextrin, alkalized cocoa powder, whey protein concentrate (milk), non-dairy creamer (sunflower oil, maltodextrin, sodium caseinate (a milk derivative), mono- and diglycerides, tocopherols), natural and artificial flavors, and less than 1% of: potassium chloride, whey protein isolate (milk), medium chain triglycerides, inulin, canola oil, magnesium oxide, soluble corn fiber, potassium bicarbonate, acesulfame potassium, DL-alpha tocopheryl acetate, sucralose, whey protein hydrolysate (milk), ascorbic acid, soy lecithin, calcium phosphate, ferrous fumarate, vitamin A palmitate, niacinamide, zinc oxide, copper gluconate, D-calcium pantothenate, lactoferrin (milk), cholecalciferol, pyridoxine hydrochloride, thiamine mononitrate, riboflavin, chromium chloride, folic acid, biotin, potassium iodide, cyanocobalamin.

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Scope: This page applies specifically to Muscle Milk Pro Series Protein Powder, Knockout Chocolate (Knockout Chocolate — tub) · UPC 660726534212. Other sizes, flavors, or formulations may differ.