Lean Optimum » Protein Powders » Isopure Protein Powder (2020 Review) | Is This Supplement Worth Buying?

Isopure Protein Powder (2020 Review) | Is This Supplement Worth Buying?

Isopure Protein is a keto-friendly, zero, or low-carb protein supplement. It’s made from 100% whey protein isolate and contains zero sugar, gluten, or lactose.

Each serving of Isopure Protein Powder contains 25 grams of pure whey protein isolate, so it’s great for supporting muscle growth, maintaining energy levels and meet daily protein requirements.

What is Isopure Protein Shake by Nature’s Best

Isopure Zero-Carb / flavors and price options

The zero carb option can help people on a keto diet meet their daily macros, especially because it forms a great base for keto smoothies and can easily be added to keto recipes. It offers 25 grams of protein per serving.

The unflavored one is especially versatile in this department, but it seems to be missing from their listings at the moment, although it is available on Amazon.

The high level of whey proteins means it’s also really good for people like bodybuilders who want to build muscle quickly and effectively.

But other athletes can also reap the benefits of this Isopure zero carb protein drink. It’s got everything you need to keep your energy up, but with only 100-110 calories per serving, it’s also a good option as a meal replacement if you’re trying to lose weight.

But be aware that this is a protein powder intended to build muscle, not to replace meals.

As a result, it has all the right ingredients to give you energy and support your muscles, but it is not a nutritionally sound “meal” on its own.


Is Isopure FDA Approved?

No, it’s not FDA evaluated (as most supplements) and it is not considered to be a meal replacement either.

not FDA approvedThis can because of some concerns. Without a proper standard of testing, there is no way to know whether the product meets recommended health standards.

There could be any number of things in the product that don’t appear on the label, because we don’t know how or where the ingredients were sourced from and what they may contain before being processed into the powder.

If you are looking for a proper meal replacement, with a nutritionally sound list of ingredients, rather try the Perfect Keto Whey Protein Shake.

Even if you aren’t keto, it’s a really wholesome alternative that can still help you build muscle or lose weight, whichever you want to achieve.

What Are the Different Flavors of Isopure Powder


Dutch Chocolate

This is a rich and indulgent flavor that many people seem to love. It is one of the most popular flavors of Isopure zero carb protein powder.

Toasted Coconut

The toasted coconut flavor adds an exotic twist to milk. It’s not a very popular flavor, but those that like it love it.

FlavorsCookies and Cream

One of the more popular flavors, cookies, and cream can be one of the flavors you either love or hate. It’s not overly sweet, which some people enjoy, while others prefer the Dutch Chocolate or Vanilla Cream.

Vanilla Salted Caramel

It is an interesting mix of sweet and salty that some enjoy. This is best mixed with a type of milk or milk substitute.

Pineapple Orange Banana

A flavor for the brave, this is a zesty and fruity mix that mixes well with water or juice for a refreshing summer drink.

Creamy Vanilla

One of the most popular flavors, although be advised that this is not ice-cream flavored. It’s a mild vanilla flavor that goes well with milk products.

Banana Cream

Another popular flavor, especially for those that miss their bananas on keto! Of course, it’s not the real deal, but it’s a very good substitute!

Strawberries & Cream

A yummy, decadent delight that’s very popular. It’s fruity and creamy, without being too sweet or overpowering.

Mango Peach

Not a hot favorite. As with the other more zesty fruit flavors, the premade bottle is better than the powder.

Apple Melon

Give this flavor a miss in the powder. It’s very tasty in the premade bottle form, but the powder detracts from the taste experience.

Alpine Punch

Not a very popular flavor, it is supposed to be a fruity treat, but the powdered version falls short.


While it has no flavor, this is one of the most popular flavors as you can mix it with ANYTHING, because it really does taste like nothing. This is also the best flavor of Isopure you can buy, but I’ll get into the reasons below.

Isopure Zero-Carb Protein Powder Ingredients

Whey Protein Isolate

As with most other keto-friendly protein drinks, the protein from the whey has been extracted, so there is no lactose in the final product. Just 100% pure whey protein, which is very rare for a whey protein as they are usually a blend of different types of whey.

Vitamins in Protein

Vitamin and Mineral Blend

Isopure has selected a blend of vitamins and minerals that are designed to help support you during and after exercise. The high levels of vitamin B ensure that you have a boost of lasting energy.

The protein powder has more vitamins and minerals than most, making it surprisingly healthy, but nutritionally it still lacks a balanced macro profile, so it cannot be considered a meal replacement.

Soy Lecithin

This emulsifier and flavor protector is actually pretty healthy, especially if you have high cholesterol.

But, if you’re dubious about the effects of GMO foods, it might be best to steer clear of this product and opt for a GMO-free brand like Perfect Keto Whey Protein, which is non-GMO.

Natural and Artificial Flavor

BEWARE! I recently discovered something very interesting. Clean Label Project, a scientific research project that checks if foods actually contain what they say on the label, has marked flavored Isopure Zero Carb Protein Powder with only 1 star… But, the unflavored version holds five stars?

The group itself has been criticized for not disclosing its findings explicitly and not being reviewed… But taking into consideration that you are probably ingesting things that aren’t on the label is definitely a cause for concern, regardless of the amounts of damaging compounds.

Now, I’m not sure exactly what the flavored versions have in them, but I’d steer clear of them because it could be anything from a molecule of lead or arsenic to 45% the recommended allowance of BPA per serving… I’m sorry I can’t be of more help, but rather stick with the unflavored powder.


This is a non-essential amino acid that supports healthy muscle function and growth. It’s found in most low-carb protein powders and can accelerate muscle repair post-workout.


It is basically sugar. Sucralose is derived from sugar, and some studies show that it may, in fact, alter blood sugar and insulin levels, besides being quite harmful in other studies.

All that info is expanded on here… But suffice it to say, go for the unflavored powder, which should have less sucralose in it, if any.

Xanthan Gum

This is another hidden carb. Xanthan Gum is fermented sugar that’s used to help powders dissolve in water. While it isn’t considered to be a true carbohydrate, it still breaks down to its component parts, which is glucose during digestion.

If you’re strict keto I would really suggest opting for Perfect Keto Whey Protein at this point…

What Are ISOPURE ZERO CARB Benefits & Side Effects

  • It’s a source of good protein.
  • 100% Whey Isolate, with no lactose.
  • It helps support and build muscle.
  • It can be used to either increase or reduce daily calorie intake.
  • Convenient and versatile, especially the unflavored version.
  • High in Vitamin B, for added energy.
  • Relatively cheap compared to other protein shakes.
  • Nausea
  • Upset Stomach
  • Bloating
  • Headaches

Please note that it is unclear what the exact cause of these symptoms are. You may find that Isopure works really well for you, or you may find you get symptoms of side effects even if you aren’t especially sensitive to protein supplements in general as is the case with one of my clients.

Do Isopure Shakes Help You with Weight Loss?

They can definitely aid in weight loss if you use the shake as a meal replacement.

shop for Isopure for Weight Loss / free shippingPlease do, however, note that this is not intended as a meal replacement.

In other words, you will not be getting everything you need from the shake.

The low-calorie count does, however, mean that you can add other ingredients to create a more balanced meal replacement smoothie that can still be below 300 calories per serving.

If you’re looking for a convenient, all-in-one meal replacement, I suggest trying Perfect Keto’s Whey Protein Shake, which is much more balanced and has added MCTs for accelerated weight loss.

Isopure can also be used between meals to increase daily calories and help you gain weight, especially muscle mass.

Final Conclusion. Is This Isoupre Low Carb Protein Powder Worth Buying?

This is a tough one. Before I answer, let me just explain something I’ve wanted to say throughout the article.

I have a friend who used to swear by this protein supplement. Used to, until about a year ago…

After ordering from Amazon for ages, the product’s quality suddenly declined around the middle of 2018. Suddenly the once smooth shake was lumpy and tasted a lot different…

Now I’m not sure if it’s just the Amazon supply that’s defective or whether all the retailers (GNC and Wallmart included) are suffering from the same problem, but in the meantime, I got my friend hooked on Perfect Keto’s Whey Protein

So really, personally, I can’t recommend Isopure over Perfect Keto. My suggestion is, try the Perfect Keto. I can give you a 15% discount on it. And if you don’t like it, then trying Isopure isn’t a bad idea.


That being said, Isopure has a very good vitamin and mineral profile, but the added sucralose and xanthan gum make it a bit less keto-friendly than advertised.

This isn’t a huge issue if you aren’t strict keto or low-carb, or you have diabetes… But it definitely can be if you are.

Considering the decline in product quality, the allegations from Clean Label Project and reports of “false advertising” – their Amazon product page shows the wrong labels, and yet there is a warning that you should read the label carefully before purchase, which makes me feel a bit uneasy about this product.

I would use the unflavored version of this product as the tasteless powder can be added to any recipe to increase protein, vitamin, and mineral intake, but other than that, there is really nothing that puts Isopure above Perfect Keto in my books.