Core ISO
Core Nutritionals

Core ISO

Ultra-Pure Whey Protein Isolate
Designed To Build, Recover And Sustain Muscle*
9.7  out of 10  (12 Reviews)
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Product Overview

Core ISO - Ultra Pure Whey Protein Isolate

If the post-workout environment were a jungle, whey protein isolate (WPI) would be the lion – its king. Newer proteins enter into the market, receive fanfare and applause, and then inevitably fall out of favor. WPI, however, is the U.S. Dollar, Greenwich Mean Time, or Michael Jordan’s dunking prowess: it is the reference standard against which everything else is measured. The success or efficacy of all other proteins is gauged relative to what the one true king, WPI, has previously done.

So, given WPI’s long-standing Elvis status, there is simply no way it could be improved on. Right? Wrong. Amino-filled and/or spiked, low quality, low purity WPI formulas still run rampant on the market – robbing consumers of what they should be receiving, and exchanging the king for a jester.

That has never been Core’s approach, and it never will be. With Core ISO, we have developed the purest, highest-quality, least-adulterated WPI product on the market. We have taken the highest purity, non-instantiated, non-soy, non-GMO whey protein isolate available, and essentially added nothing to it: we have added no sugars, making it the perfect versatile protein; and we have added no artificial colors, meaning you can feel good about drinking it.

Core ISO is, simply put, the pinnacle. Our protein’s quality and level of purity transcends it to the level of being a necessity; a part of your supplement and training setup that is simply assumed to be there, because it must be there. So, if you are already taking or planning to use protein, why not use the version of the standard that rises above the rest?

Ratings & Reviews

Core ISO
Overall Rating
12 Ratings
Verified Buyer Rating
5 Ratings
Average Flavor Rating
2 Flavors
Top Rated Flavor
Peanut Butter Toffee
By clicking the button above, you agree to entering the Reviews section. Products in the Store are not intended to diagnose, treat, cure, or prevent any disease.
Dec 08, 2018

Excellent protein, very easy to digest and with great chocolate flavor!

Jan 05, 2018
  • 9 Peanut Butter Toffee
Dec 10, 2016
Verified Buyer

This is a super delicious tasting ISO protein. Most ISO proteins are really lacking in flavor but not this one. There are not artificial flavors or colors either. Both chocolate and the peanut butter flavor are really good. I prefer the chocolate but its close. If you're looking for a great ISO give this CORE a try

Jun 27, 2016
Verified Buyer

I have been using Core ISO about a month now and really like it. There is not a ton of additional ingredients and it tastes good. Being an ISO is does not upset my stomach in the slightest which is huge for me given I consume so much of the stuff!

Apr 26, 2016
  • 2 Peanut Butter Toffee

This seems to be a decent source of whey protein isolate, but I can't handle how sweet it is. I recommend buying an unflavored whey protein isolate and mixing it with peanut flour. You can achieve the same nutrition level without the sickening sweetness and artificial sweeter used in ISO. If used post-workout, you can add coconut nectar, which is a low glycemic sweetener, if you really need to get a 'sweet' fix. **Note that I am not a nutritionist, simply an avid researcher focused on getting gains in the most natural way possible :)

Feb 26, 2016
Verified Buyer
  • 10 Peanut Butter Toffee
Feb 25, 2016

For clarity purposes, I won this product through a company promotion on social media. Where to even start, let's see. First off the taste is incredible! I received Chocolate Decadence and it was AMAZING. Hands down, one of the best tasting isolates ever. Secondly, the ingredient profile is everything you could want low fat, low carbs and high protein (1g/1g/24g). It's a dream if macros are tight, but honestly anyone can benefit from this. Overall, the product was exactly was it stated to be. A top grade whey protein isolate with no artificial junk or fillers. If you want quality and amazing taste, this is your isolate, folks! Thank you Core Nutritionals for the opportunity.

Jan 05, 2016
  • 10 Peanut Butter Toffee

Profile in this is what caught my eye, 1g fat, 1g carb 24g protein, non-spiked no artificial colors! Thats hitting it out of the ball park in today's age of spiked powders. This mixes smooth in milk or water, and doesn't clump and spreads well in Proats! This also has a good mix of PB to Toffee prob a 50/50 not overly peanut butter(Which I do like) but you definitely get the toffee at first bite/sip and then the PB kicks in. Like everything with core their products are not overly sweet, no after taste or grittiness. I suggest this to anyone looking for quality and great taste!

Dec 27, 2015
Verified Buyer

This is by far the best post workout I have ever used. The chocolate taste is awesome and it mixes well. It helped me get leaner and build more muscle. I love it and I would highly recommend it.

Oct 05, 2015
  • 10 Peanut Butter Toffee

I used 2 scoops with 16oz of whole milk & 1/2 cup of ground oats with breakfast.The taste is mild and toffee taste is more pronounced.It mixes great and no clumping or residue left.Another great product from Core Nutritionals.

Jul 19, 2015
Verified Buyer

Great tasting and made from 100% of the highest quality whey you can get. Core Nutritionals does not compromise their products with fillers or spiking with loose aminos. This is a purpose built protein for fast absorption, post workout.

Jul 11, 2015
  • 10 Peanut Butter Toffee

Great product and taste is amazing!!

2 Sizes
3 Lbs.
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1 Flavor
Peanut Butter Toffee
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Price: $80.99  ($1.69 / Serving)
Flavor Rating: 9.4


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Designed To Build, Recover And Sustain Muscle*

What's in Core Nutritionals Core ISO

Serving Size: 1 Scoop (28.4g)
Servings Per Container: 48
Amount Per Serving % DV *
Calories 110       
Calories From Fat 9       
Total Fat 1 g 1.5%
Saturated Fat 0 g       
Trans Fat 0 g       
Cholesterol 1 mg 0%
Sodium 41 mg 2%
Potassium 27 mg 1%
Total Carbohydrate 1 g <1%
Dietary Fiber 0 g 0%
Sugars 0 g
Protein 24 g 48%
Vitamin A 0 IU 0%
Vitamin C 0 mg 0%
Calcium 100 mg 10%
Iron 0 mg 0%
Phosphorus 15 mg 1.5%
† Daily Value not established.
* Percent Daily Values Based on a 2,000 Calorie Diet
Other Ingredients:
Cold-Processed Microfiltered Non-GMO Whey Protein Isolate, Peanut Flour, Natural Flavors, Xanthan Gum, Sucralose.
ALLERGEN STATEMENT: Contains Milk, Peanut, and sunflower (lecithin). Processed in a facility that uses tree nuts, soy, egg, and wheat ingredients.

Directions For Core ISO: Add 1 scoop to 6-8 ounces of cold water and shake or stir until mixed. 

Warnings: This product is only intended for use in healthy adults 18 years of age or older. Pregnant or nursing women should not use this product. Consult your healthcare provider before using this product, especially if you are taking any prescription, over the counter medication, dietary supplement product, or if you have any pre-existing medical condition including but not limited to: high or low blood pressure, cardiac arrhythmia, stroke, heart, liver, kidney or thyroid disease, seizure disorder, psychiatric disease, diabetes, difficulty urinating due to prostate englargement or if you are taking a MAOI (Monoamine Oxidase Inhibitor) or any other medication. Discontinue use and consult your health care professional if you experience adverse reaction to this product. Do not exceed recommended serving. Do not use if safey seal is broken or missing. Keep out of reach of children.

* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
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