Muscle Milk Pro Series 40 Review

We, humans, are fueled by protein. Every cell in our body contains such macronutrients. We need it to help the body make new cells and repair the damaged ones. Protein does so much more than these, of course.

And although we get proteins from food, such as meat and fish, people who live an active lifestyle need to consume more protein to give them extra energy and help with muscle recovery through their workout. 

That is why protein supplements, protein powder, and protein shakes are created for these individuals. 

If you are among such a group of people searching for a protein shake for overall wellness, build muscle mass, or improve sports performance, the Muscle Milk Pro Series knockout chocolate flavor is a product that is worthy of your consideration.

The Muscle Milk Pro Series 40, from the name itself, gives you 40 grams of protein to help fuel your body after a workout.

But is Muscle Milk Pro Series right for your fitness needs and body weight? To answer this question, we provide you this in-depth review to help you decide if it’s good incorporating this protein shake into your diet.

TLDR: Review of the Muscle Milk Pro Series 40

A 14 fluid ounce bottle of Pro Series (Muscle Milk) protein shake already contains 40 grams of protein to help support muscle growth, muscle rebuilding, and maintenance of muscle mass.

Compared to pre-and post-workout protein powders, the Pro Series offers immediate protein delivery since you no longer have to mix it with water or liquid of your choice. Instead, you just open the cap and you’re good to go.

One bottle of  Pro Series contains all 9 essential amino acids that the body does not produce. Among the key benefits of this pre-or post-workout protein shake is that it contains 20 essential minerals and vitamins.

It is also gluten-free and can be taken even by people who are sensitive to lactose but not to the “very sensitive” ones. It’s better compared to Milk Protein isolate, which may cause digestion problems on occasions.

You may also consider this as a meal option (on-the-go breakfast) or an anytime snack, though we suggest that you still consume food as it is primarily designed just to supplement your diet.

You can purchase the knockout chocolate, banana, intense vanilla, vanilla, or strawberry flavors.


  • Gluten-free
  • Contains 20 essential minerals and vitamins
  • Suitable for people sensitive to lactose
  • Immediate protein recovery than protein powder
  • Anytime snack or on-the-go breakfast
  • For workout recovery and strength
  • Contains calcium and vitamin D
  • Helps build strength and rebuild muscle post-workout


  • Few people don’t like the aftertaste

Is it worth it?

This 14 Fl oz protein shake from Muscle Milk is worth considering as a snack or high protein meal option after your workout.

You may also take this sometimes for breakfast to help fuel you up, but you should still pay attention to the number of calories you consume throughout the day or during meals. You should not ignore your body’s nutritional needs, but it does not mean you should overconsume.

In terms of packaging, value for money, and flavor, we give this protein shake an above-average rating.

Interested? You can purchase it here!

In-Depth Review of the Muscle Milk Pro Series 40

Nutritional Facts

14 Fl oz

Servings Per Container 1

Calories: 200

Calories from Fat: 25

Total Fat: 2.5g,4%DV (Percentage Daily Value based on a 2,000 calorie diet)

Saturated Fat: 1g, 5%

Polyunsaturated Fat: 0g

Trans Fat: 0g

Monounsaturated Fat: 1g

Cholesterol: 25mg, 8%

Sodium: 290mg, 12%

Potassium: 780mg, 22%

Total Carbohydrate: 10g, 3%

Dietary Fiber: 5g, 20%

Sugars: 1g

Protein: 40g, 80%

Included also in its ingredients are calcium sodium caseinate, potassium citrate, milk protein isolate, water, ascorbic acid, soy lecithin, acesulfame potassium, and alkalized cocoa powder.

Who is it Best for?

The 40g protein shake (knockout chocolate flavor) from Muscle Milk is ideal for gym-goers. bodybuilders, and fitness enthusiasts who are on the go and need immediate protein delivery in the body after hard training.

Athletes who need nourishment and people who exercise regularly can also take this protein shake.

What Do People Say About it?


This high protein content product enjoys an above-average rating from Amazon. One user Isaac shared “[I] drink one in the  morning and I don’t have to eat until 5 PM, and I [still] feel great all day.”

It does wonder in curbing post-workout muscle soreness [too],” he added.

Another reviewer who goes by the Amazon username sk8888 said his dad was recuperating after a hip replacement. 

When they noticed that he was losing weight and that he was feeling that his muscles weakened, they encouraged him to take this protein shake from Muscle Milk.

We coupled that with a peanut butter high-protein bar, and we think we have found a winning combination. If you have parents in the hospital or a rehab facility, post-surgery, don’t be afraid to give your loved ones extra protein,” he wrote.


Jack Sutcliffe of JS Fitness YouTube channel shared, “To be honest, this pleasantly surprised me. Smells-wise, it’s like when you’re making, like a chocolate cake. In terms of the taste, it’s not terrible and you’ve got the chocolate flavor in there.”

“I’m a little bit torn. The reason being, it tastes okay to start with but the aftertaste, it’s like ***,” Sutcliffe cut his sentence and showed a hesitant expression, referring that he didn’t like the aftertaste at all.  “But with the price, you really can’t complain. If you’re on the go and you need some protein, get this and you’re gonna be fine.”

Meanwhile, DIY Pinto said, “[It’s something] I drink to get my protein every day. This [knockout chocolate-flavored protein shake] contains 40 grams of protein, which is equivalent to eating two chicken breasts all in one container.

“It is actually smooth and does not have a chalky taste, which sometimes you get with other protein drinks,” he said in contrast to Sutcliffe’s comment about the aftertaste.

The Bottom line: Should You Buy It?

If your goal is to keep the protein supply of your body at peak levels, especially when you’re working out, then yes, we recommend this knockout chocolate-flavored protein shake.

We like the fact that it contains the essential amino acids that are helpful for the body after a workout. It is designed to provide sustained energy.

Another thing, it’s not that pricey and is available in a ready-to-drink package, which is such a convenient way to help satisfy your nutritional needs. If you want, you may also try the other flavors or the powder form packages.

Safety warning: Although CytoSport Muscle Milk markets this product as lactose-free and some says it “contains no milk” because it does indeed not contain actual milk but derivatives of milk, the FDA still requires the manufacturer to say on its label per bottle that the ingredients are “derived from milk.”

If you like this article, you might want to read our other reviews at

Nathan Lloyd, MSc

I’m a personal trainer, based in Boulder, Colorado.
I service clients physically in the Boulder area, mainly in the ONE Boulder Fitness Gym, but am also available for online consulting and coaching.

If you’re interested in my personal coaching programs, please contact me via the contact page.

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