Isopure vs Optimum Nutrition

Protein is an important macronutrient for muscle building, toning, strengthening and recovery, weight loss or maintenance, food craving reduction, and a stronger immune system.

To meet our protein daily requirement, we incorporate protein-rich food in our diet like chicken, beef, pork, milk, soy, dairy, eggs, nuts, legumes, etc. However, some people still struggle to meet the recommended amount of proteins from food consumption alone.

Furthermore, physically active individuals like athletes and gym enthusiasts have higher protein needs. 

This is why protein powders are created. Aside from the convenience they provide, these protein supplements can be a great way to help fill in the extra protein to meet our dietary needs. 

And when it comes to whey protein powder, there are two most talked about brands — The Isopure zero carb and the Optimum Nutrition Gold Standard Whey Protein.

In this article, we’ll talk about its benefits, price, ingredients, and key features to find out which of these two suits your needs better. 

Interested to know more? Keep reading as we provide you with an in-depth comparison about Isopure vs Optimum Nutrition.

Isopure vs Optimum Nutrition Whey Protein Powders 


Both Isopure and Optimum Nutrition are made of whey protein isolates. Whey Isolate has 90–95% protein component, which is the most concentrated form of protein. That’s why fitness enthusiasts prefer whey protein isolate as a post-workout or pre-workout meal.

The two protein powders also have vitamins and minerals, minimal to zero carbs, and 5.5 grams per serving of Branched Chain Amino Acids (BCAAs). 

These BCAAs play a significant role in muscle building and recovery after a workout.

[You might also want to read: Muscle Milk Genuine Protein Powder Review]  

Isopure Whey Protein Powder Overview


Product Description

If you are watching out for your sugar intake and carbohydrates, Isopure is a good option.

Isopure protein powder allows you to choose from zero carbs or low carbs while providing 25 grams of protein per serving. 

Both Isopure Low Carb and Isopure Zero Carb contain 100% whey protein isolate, a high-quality protein that is great for gaining muscle mass, repairing muscle tissues, recovery, and improving endurance. In addition, it has about 20 vitamins and minerals, for optimal health.

It has zero sugar and 4 grams of Glutamine, which is essential in maintaining muscle protein and burning fats.

It is also keto-friendly and free from glucose.

Key Features

  • Option to choose from Low to Zero Carbs (Zero Sugar)
  • Supports immune system (contains vitamin E, C, A, and Zinc)
  • Contains 100% whey protein isolate 
  • One scoop (31g) provides 25g of protein 
  • With BCAA for better performance during exercise 
  • Keto-friendly 
  • With 20 vitamins and minerals 
  • Gluten-free
  • Zero Carb flavor available: Banana Cream, Cookies and Cream, Creamy Vanilla, Vanilla Salted Caramel, Strawberries and Cream
  • Low Carb flavor available: Dutch Chocolate, Toasted Coconut, Coffee, Espresso 


  • Available in various sizes 
  • With about 9 flavors to choose from 
  • Undergoes a complete microfiltration process which makes it very easy to mix with other liquid
  • Great tasting
  • Good choice for those in a ketogenic diet
  • Gluten-free
  • Lactose-free 
  • NSF Certified
  • GMP compliant


  • A little pricey compared to other protein powders available in the market 
  • May have some a little aftertaste due to the artificial sweeteners 
  • Contains allergens milk and soy 

Interested? Here’s the link to purchase it! 

Optimum Nutrition Whey Protein Powder Overview

Product Description

When it comes to protein powder, Optimum Nutrition’s Gold Standard Whey has been one of the most tried and tested by consumers all over the globe. They have established a good reputation for their brand for over three decades!

This is because you’ll surely be getting high-quality protein with every scoop. Optimum Nutrition’s Gold Standard Whey Protein Powder has a 100% whey blend of whey protein isolate, as the main ingredient, whey peptides, and whey protein concentrate. 

It has 24 grams of protein per serving and 4 grams of Glutamine. With 5.5 grams of BCAAS, Optimum Nutrition helps build, rebuild and strengthen the lean muscle as well as increase endurance.

Gold Standard Whey Protein Powder has low carbs, sugar, and fat contents. It is also gluten-free.

Key Features

  • Whey Protein Isolate (WPI) as its primary ingredient
  • One scoop (30.4g) contains 24g of Whey Protein
  • With over 15 flavors to choose from: Banana Cream, Chocolate Coconut, Chocolate Malt, Chocolate Peanut Butter, Coffee, Cookies and Cream, Delicious Strawberry, Double Rich Chocolate, Extreme Milk Chocolate, French Vanilla, Mint Chocolate, Rocky Road, Strawberry and Creme, Strawberry Banana, Vanilla Ice cream, Mocha Cappuccino
  • With BCAA for better performance during exercise 
  • The formula has been instantized – mixes very well with any liquid 


  • New Look, Same trusted quality
  • Most awarded, best-selling whey protein powder
  • Contains few dietary fibers
  • Gluten-Free
  • Tastes great
  • Ultra-filtered whey protein concentrate makes it very easy to mix with other liquid 
  • Contains digestive enzymes that aid digestion and prevent bloating
  • No artificial growth hormone
  • Banned substance tested 
  • Available in various sizes
  • Wide variety of flavors to options 


  • May have some a little aftertaste due to the artificial sweeteners 
  • Others don’t prefer the taste when at room temperature 
  • Contains allergens milk and soy 

Interested? Here’s the link to purchase! 

In-Depth Comparison: Isopure vs Optimum Nutrition 



Item Weight: Available in 1, 3, 7.5, and 8.8 pounds


Whey Protein Isolate, Vitamin and Mineral Blend (Dicalcium Phosphate, Potassium Chloride, Magnesium Oxide, Ascorbic Acid, Sodium Chloride, Zinc Sulfate, D-alpha Tocopheryl Acetate, Niacinamide, Calcium D-Pantothenate, Copper Sulfate, Manganese Sulfate, Pyridoxine Hydrochloride, Riboflavin, Thiamine Hydrochloride, Vitamin A Acetate, Chromium Chloride, Folic Acid, D-Biotin, Potassium Iodide, Sodium Molybdate, Sodium Selenite, Phytonadione, Cyanocobalamin), Soy Lecithin, Natural and Artificial Flavor, L-Glutamine, Sucralose

Recommended Usage

For a rich, thick consistency, mix 1 scoop with 6-12 fl oz of water, milk, or your favorite beverage in a shaker or blender. If a shaker or a blender is not available, Isopure can be stirred into solution with a spoon.

Optimum Nutrition Whey 


Item Weight:  Available in 1, 2, 5, and 10 pounds


Protein Blend (Whey Protein Isolates, Whey Protein Concentrate, Whey Peptides), Cocoa, Lecithin, Natural and Artificial Flavour, Acesulfame Potassium

Recommended Usage 

Mix one scoop (32 grams) of Optimum Nutrition Whey powder in a 6-8 fl oz of cold water, non-fat milk, or other preferred beverage, for 30 seconds, you can stir, shake, or blend until dissolved. 

Taste and Consistency 

One of the most common issues for protein powders available in the market is its grainy mouthfeel and consistency as well as its ability to mix with other liquids, some may even require you to use a blender just for it to mix well. This is kind of a tedious process especially for those individuals who are always on the go. 

The good thing is, unlike other protein powders out there, Both Isopure and Optimum Nutrition Whey can be readily dissolved in any liquid even just by stirring using a spoon. Thanks to its instantized and complete microfiltration process.

As for its taste, both protein supplements taste great, however, optimum nutrition offers a more extensive selection of flavors with about 20 options to choose from compared to Isopure with about 9, which is not bad either. Its wide variety of flavors will surely have something that can suit your personal taste preference. 

Moreover, If you prefer a thicker and creamier consistency, Isopure would be for you. 

Who is it Best For 

Isopure is ideal for those who are watching out for their carbohydrate and fat intake. Since it uses whey protein isolate as the primary source of protein, it undergoes a process that removes nearly all of the carbohydrates and fat, making it a great option for those on a keto diet. They are also more ideal for those individuals who struggle with lactose intolerance as the process also significantly reduces lactose presence. 

On the other hand, Optimum Nutrition is best taken by people who are not very strict when it comes to adding a few additional macros from carbs and fats. 

Both support muscle building and recovery and can be a convenient way to help meet your protein requirement daily. Best for those who regularly exercise, active and aging individuals. It helps maintain muscle health at its best even as you age.

What Do People Say About It?


Both Isopure and Optimum Nutrition have good ratings on Amazon. 

A verified buyer of Isopure has expressed how she loves the taste, especially the cookies and cream ones. She wrote:

I am really picky when it comes to flavors, texture, and just all-around taste. I’ve probably spent a good thousand dollars on different brands of protein powders and hated all of them. This one is different. I bought the Cookies n Cream. As soon as I opened it, it smelled absolutely amazing. It didn’t have that “I’m a protein powder” fake, sugary smell. This smelled legit like cookies. The taste is just as good. Not overly sweet, and great when mixed with Almond milk.”

Moreover, here is one review was that written by a verified buyer of Optimum Nutrition: 

“Optimum Nutrition certainly sets a “gold standard” with this line of protein. It is as popular as it is for a reason; it is of great quality for a great price. This protein tastes amazing, it’s smooth, and it doesn’t have a bunch of garbage fillers. You’ll be happy to see that the scoop is normal-sized, a tell-tale sign of quality protein. One of my favorite qualities about this protein is that Optimum Nutrition runs it through an additional process called “instantizing” which allows the protein to dissolve quickly and smoothly into any medium. You don’t even need a blender/blender ball to mix, just give it a shake in whatever container. Highly recommend it to anyone with any fitness goals.”


Berry Beautiful youtube channel posted a review of the Isopure Zero Carb protein powder in creamy vanilla wherein she tried it as a substitute for the previous low-carb protein powder she loved. She takes protein powder to help her get in better shape by building more lean muscle. 

She mentioned the thing she likes about Isopure: “What I did like about this Isopure was the fact that it was 0 carb and it did have a good flavor of the creamy vanilla… I did try it with just water and protein powder alone and it was fine drinking it that way too. I think the flavor was really good.” 

What she didn’t like: “It has a lot of potassium and sodium for her taste.”

While Barbend reviewed Optimum Nutrition Gold Standard Whey. In the video, he did a taste test of the double-rich chocolate flavor and mixed it in milk and water. 

In milk: “It mixes very very well, it’s relatively mild especially for a flavor called double rich chocolate, the flavor that I am getting is more of dark chocolate, like more cocoa flavor than a really creamy rich chocolate. As combined with milk, it comes together really nicely”.

In water: “kind of so so with water, it tastes quite a bit more spoonful of cocoa mixed in with water… It’s fine with water but I really preferred it with milk”

He also talks about its nutrient content, ingredients, price, pros, and cons. 

The Verdict: Which One is Better?

Protein powders are a powerful supplement to an active lifestyle. With the key benefits of muscle building and recovery, weight management support, and optimal muscle health, the two protein brands, Isopure and Optimum Nutrition, are good choices.

In terms of its calories and protein content per serving, taste-wise (Both taste great). Differences between the two are minimal. 

However, Isopure seems to be the better option in terms of providing more added nutrients. 

It is loaded with more micronutrients — Vitamins and Minerals that are essential for other body processes, like supporting immunity, bone health, normal cell function, and development. 

On the other hand, if you are considering more flavors to choose from and are more gentle to the gut, optimum nutrition is to consider. This has digestive enzymes that assist digestion, which help lessen chances of digestive discomfort like bloatedness. Plus, Optimum Nutrition is cheaper as well. 

Safety Information

As with any dietary supplement, These products are intended for healthy adults over 18 years old. If you are nursing, pregnant, or considering pregnancy, you should consult your health care practitioner prior to using this product.

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