Slender Blend Review – Is This Protein World Powder Effective?

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By Scot Mills

Reviewed by Juliana Tamayo, MS, RDN - Last Updated


Protein World has your beach bod ready and waiting–just buy their products and include them along with your good diet, exercise, and sleep habits. That’s because they’ve been producing high-quality sports nutrition that closes the gap in the female-friendly sports supplement market since 2012, which means they’ve had time to learn a thing-or-two about premium protein products. 

So let’s take a look at Slender Blend, which is a convenient, high-protein meal replacement, snack, or post-workout shake. Is it truly what you need to wave bye-bye to the pounds while welcoming the lean muscle mass?

Let’s have a look and see in this Slender Blend review!

Protein World Slender Blend 3pax

About Slender Blend

Slender Blend combines protein, thermogenic boosters (AKA caffeine), probiotics, vitamins, minerals, digestive enzymes, and prebiotics into one convenient, naturally flavored shake. There are both vegan and whey protein options, and both are available in a whopping 10 flavors (hope you like choices!). 

The product is also low calorie, low sugar, low fat, and will help you feel fuller longer both by slowing your digestion with protein and fiber as well as revving up your thermogenic fat burning capacity. 

The Slender Bend

Slender Blend Benefits

High Protein

Of course, when you spend your hard-earned on a protein shake, you want it to have as much of the high-quality stuff as possible to slow your digestion, increase lean muscle mass, and help you burn fat.

With Slender Blend, this means your choice of either whey protein concentrate or vegan protein from sources containing all 9-essential amino acids. This not only gives your muscles the building blocks they need to recover quickly from hard workouts but also slows your body’s desire to run on sugar and other carbs. 

It does this in two ways: by slowing your digestion to reduce your body’s insulin response and by not giving your body carbs to burn in the first place! 

However, though Protein World claims no added sugar, there are somehow 7.8 grams of the nasty stuff per 40-gram serving. We’re guessing it may come from the natural flavors in the product, though there needs to be more transparency here since they’re seemingly reluctant to disclose just what these natural flavors are. 

Protein World Slender Blend Protein

All-in-One Nutrition

Whether you’re trying to keep up with a hectic lifestyle and workout schedule, or you just want something to tide you through your afternoon, convenience counts. This includes having much of your essential nutrition all in one shake that mixes macronutrients, micronutrients, and digestive components together so that all you have to do is mix it up and enjoy! 

In fact, for all the convenient nutrition it delivers, the hard part may be figuring out which of the 10-flavors to choose from. 

Protein World Slender Blend Powder

Promotes a Healthy Gut

When it comes to protein shakes and meal replacements, there’s a LOT of them on the market these days. But what many forget about is that no matter how much nutrition is packed into something, it only does as much good as your body’s ability to digest and metabolize it. 

That’s why Protein World adds fiber, probiotics, and digestive enzymes to their formula so that there’s yet one more thing they think about so that you don’t have to. 

Helps You Burn Fat

Though most of us understand that a high-protein diet slows digestion and keeps carbs from converting to fat, what we may not realize is that loads of protein also boost calorie burn by making your digestion work harder. 

And yes, you heard that right—your gut uses energy to break down food compounds, and the more complex they are, the harder it has to work. Since proteins and fats tend to be more complex than sugars, your body takes longer and has to do more “reps” to break them down, which also requires more calories to perform.

Remember that your body breaks down simple sugars faster than it can burn them (unless you have the metabolism of a hummingbird, that is), which is why carbs are often stored as fat for later. Since protein and fat don’t break down as readily, your body doesn’t need to set much aside for later since your gut is doing all it can to keep up with the supply. 

Protein World Slender Blend Blend

Slender Blend Ingredients

Slender Blend includes a large variety of ingredients within its formula. Below we will take a thorough look at each ingredient and its dosage per Slender Blend’s 40gram serving.

Slender Blend Ingredients

Whey Protein Concentrate or Vegan Protein Blend (Vegan protein contains pea, quinoa, and hemp proteins; and the whey version also contains skim milk powder) 23.2 g

With each shake providing over 23 grams of your choice of high-quality vegan or dairy protein, Slender Blend delivers its most important component and delivers it well. This gives you all 9-of the essential amino acids your muscles need to rebuild after a hard workout, as well as all of the protein’s other benefits, which include:

  • Boosting your metabolism
  • Lowering your blood pressure
  • Reducing your risk for osteoporosis
  • Helping your entire body repair itself

Remember that you’re largely made of protein, and by consuming a high-protein diet, you’re not only doing your muscles well, you’re also giving your body the amino acids it needs to keep your heart, bones, joints, and even hair, skin, and nails healthy and strong. 

Vitamin and Mineral Blend delivering between 15% – 60% RDA of most essential water and oil-soluble vitamins, and minerals

Why hassle with a bunch of bottles and pills to stay up with your nutritional needs when all you need is one shake? With Slender Blend, you get a full spectrum of the essential vitamins and minerals it needs to work its best. This includes hormone-friendly compounds to reduce your stress response, such as magnesium and chromium, as well as B-complex for your nerves, metabolism, and blood, and of course vitamin D for strong bones and healthy androgens to power your workouts. 

Thermogenic Blend, which includes Guarana Extract (22% caffeine) (100 mg), and Green Tea Extract (40% polyphenols) (100 mg)

While caffeine can effectively crank up your metabolism and help you burn more fat, too much can have detrimental effects that mimic your body’s stress response. This includes stimulating cortisol production, which in turn causes your body to store fat rather than burn it. 

That’s why we’re happy to see that Protein World takes it easy on us by “only” including about a cup of coffee’s worth of the zippy stuff. While you still need to mind your other daily sources of caffeine to avoid overdoing it, this enables you to get caffeine’s benefits while avoiding the jitters, sleeplessness, and cortisol buildup that can happen with too much. 

Plus, the green tea in Slender Blend helps keep you calm by providing L-theanine, which is an amino acid that pairs nicely with caffeine since it counters caffeine’s zip with calm. This leaves you locked into a strong sense of focus with plenty of energy to work out and get things done and a wonderfully relaxed sense of wellbeing. This is further enhanced by green tea’s potent antioxidant activity to reduce inflammation and help clear the brain fog while increasing your ability to recover and burn fat. 

Enzyme Blend, which includes Lactase (3500 ALU) (40 mg), and Protease (10,000 HUT/g) (25 mg)

Bacteria aren’t the only microscopic digestive aids since enzymes are also necessary for breaking down and processing proteins, carbs, fats, and other nutrients. Though enzymes themselves aren’t living things, they are a type of large protein that is produced in the cells of microorganisms, plants, and other living things. 

This includes lactase, which helps with the breakdown of lactose, and protease, which, along with making a great meat tenderizer, is a popular digestive supplement.

Probiotic and Prebiotic Blend, which includes Bifidobacterium Bifidum (1-billion viable cells), Lactobacillus Acidophilus (1-billion viable cells), and inulin (1.6 g)

Along with enzymes, Protein World adds probiotics and fiber to the mix to help ensure your digestive health is spot-on. Remember that soluble fiber—or fiber that dissolves in water—not only helps your digestion by physically moving waste along, it’s also what all the friendly microbes in you feast upon. 

That, and when it bulks up, it helps you feel fuller longer, so you’re not so tempted to snack!

But you do want to keep the little guys living inside you happy and plentiful, which is where the addition of more of their cousins coming to stay with the family (AKA more probiotics) comes in. These include acidophilus, which along with the lactase in Slender Blend, helps you digest milk products, and bifidum, which loves life in your lower bowels and can also help relieve symptoms of irritable bowel syndrome. 

And stop saying “eeww,” this is all good scientific stuff!

Does Slender Blend Work?

For those looking to tone up and lose body fat, adding Slender Blend to their regular sleep, exercise, and healthy diet program can help. It contains enough protein to make it an effective post-workout shake, and the combination of low carbs, a healthy dose of fiber, thermogenic properties, probiotics, vitamins, and minerals all make it an outstanding and convenient way to feel fuller longer while improving your digestion, energy, health, and focus. 

But the one thing we would like to see is less “fear of fat” both in Protein World’s website copy, as well as in their product. While it is true that avoiding trans fats and other unhealthy fats is in our best interest, pitching a diet product as being low calorie and low in fat is archaic thinking. Yes, fat is typically high in calories, though avoiding it entirely—especially on a low-carb diet—is simply not the way to stay slim and healthy. 

For one thing, you need healthy fats for the uptake of oil-soluble vitamins, and your brain is also about 60% fat, which means it needs a good supply to keep you thinking clearly. A diet of too little fat can also wreak havoc on your immune and digestive health, not to mention lead to brittle hair, dry skin, and poor hormone production.

So ignore the fear surrounding polyunsaturated fats since they’re an essential part of your health and weight loss. 

Protein World Slender Blend Formula

Who Is Slender Blend Best For?

Women and men who are on the go and need a convenient source of protein, vitamins, minerals, caffeine, and digestive aids can all benefit from this product. No, you don’t need to be a hardcore gym rat to use it, though it is recommended that it be paired with the regular exercise program of your choice.

That said, it also contains L-theanine-rich green tea extract, which, along with the naturally occurring caffeine in it and guarana, can leave you focused, productive, and with a rosy sense of wellbeing. This makes it the perfect mid-morning office snack to get you through the day and on your way to that big promotion. 

Protein World Slender Blend For Women

Claims vs. Reality

The only claim we’re not exactly enamored with isn’t so much a claim as it is the idea that the best way to lose weight is by limiting calories and fats. Though Protein World caters to this old-school type of thinking, we’d like to see them move forward with products that induce ketosis rather than starvation. 

Remember that the downside to a starvation diet is the lack of reward, which is usually made up for with the help of chocolate cake, piles of pasta, and everything else you’ve been missing while starving. Of course, this also brings back the pounds, which is why starvation diets almost NEVER work!

Instead, adding fat is not only satisfying; it also slows digestion, and when carbs are also limited, it will convert you into a fat-burning machine. 

Ketosis is your friend, which is why there are already so many keto-focused supplements out there – from KetoMax to Purely Optimal Keto BHB. So, all-in-all, we’d love to see Slender Blend focus more on the ketosis side.

Protein World Slender Blend Shake

Is Slender Blend Safe? 

Slender Blend contains caffeine which can cause jitters, insomnia, poor focus, and a short temper, so those who are sensitive beware. This also necessitates you minding your other sources of daily caffeine to avoid overdoing it, which may mean switching to decaf (which still has caffeine in it, by the way) and avoiding “hidden” sources of caffeine such as chocolate and soft drinks, which anyone interested in staying slim-and-healthy shouldn’t be drinking in the first place. 

You also need to consult with your doctor before using this product if you’re pregnant or breastfeeding, and if you are on any prescription medications, either your doctor or Protein World can let you know if there are any dangerous interactions you need to be aware of. Simply email Protein World’s experts at, let them know the type of medication you’re on, and they’ll provide expert advice on your options. 

Other than that, the product contains mostly essential compounds that include macro and micronutrients that you need for existence, so unless you’re allergic to food, you should be okay here. 

Where To Buy Slender Blend

You have the choice of paying $69.99 for a one-time purchase of a month’s worth (back up the Brink’s truck!), or you can knock a whopping $30 off that by signing on for regular delivery via their subscription service. There are a few other size options, though all have a similar price structure that encourages you to commit to getting this stuff on a regular basis. 

Protein World Slender Blend Website

Along with Protein World’s site, you can purchase Slender Blend on Amazon, GNC, and possibly a few other online and traditional retailers who sell quality diet and workout supplements.

Overall Rating:
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Scot Mills

Scot Mills is a nutrition writer who uses his unique skills and passions for natural products to share his research with others. Along with over twenty-years of experience working in natural industry sales, Scot graduated at the top of his class as a business major, and is a member of the Sigma Beta Delta honors society for his outstanding scholastic achievements. Scot specializes in using the latest scientific research to review supplements objectively. When he isn’t writing or hitting the gym, Scot can be found enjoying nature on epic trail runs, hikes, and mountain bike rides.

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