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Customer reviews for ISOPURE Whey Protein Isolate, Unflavored, 1.55 lbs. for
ISOPURE Whey Protein Isolate, Unflavored, 1.55 lbs.
4.3 out of 5 stars
stars
123 ratings119 reviews
  1. 5 stars58% (71)
  2. 4 stars28% (34)
  3. 3 stars10% (12)
  4. 2 stars1% (1)
  5. 1 star4% (5)

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Showing 1-10 of 119 reviews
Nov 10, 2025
Reviewer name: A.D.
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Solid

As billed great supplement. Some tips when adding to coffee - mix separate in shaker with only 4-6oz lukewarm H2O. The mix becomes frothy and adds to coffee without clumping. Overall this has been an awesome addition to daily protein intake. Additionally, though I'm lactose intolerant no issues with my stomach. Already bought more

Review from Glanbia Performance Nutrition, Inc.
Helpful?70GIW7NABGMB16150765564
Mar 20, 2026
Reviewer name: TONI
5 out of 5 stars
5 out of 5 stars review

Excellent, clean protein powder. I use it in my oatmeal, plain non fat greek yogurt,and unsweetened almond milk and love it. The best protein powder on the market. I love the fact that it is also loaded with essential vitamins and minerals since I do not take any vitamins. Thank you Sam's club for carrying this product at such a good price. You definitely beat out GNC and The Vitamin Shop.

Helpful?70GIW7NABGMB16150765564
Feb 12, 2026
Reviewer name: DJ
4 out of 5 stars
4 out of 5 stars review

Verified Purchase

Clean

No taste. Goes well in my coffee every morning. Clean ingredients compared to most. Could blend a little better but a hand blender does the trick. Reason for 4 stars.

Helpful?70GIW7NABGMB16150765564
Jan 18, 2026
Reviewer name: KEVIN
3 out of 5 stars
3 out of 5 stars review

Not so Pure

I like that there’s no sucralose or artificial crap in this. But I won’t get this again because it’s loaded with Poor Quality Vitamins. I don’t need vitamins in my whey protein.

Helpful?70GIW7NABGMB16150765564
Aug 29, 2026
Reviewer name: anonymous
3 out of 5 stars
3 out of 5 stars review

Grainy and tastes funny

This is different from what is sold at other stores. The unflavored Isopure that I have bought elsewhere only has two ingredients. This powder has lots of vitamins and minerals added to it which give it a weird taste and make it grainy. It doesn't dissolve all the way and leaves a residue in my cup.

Helpful?70GIW7NABGMB16150765564
Jun 7, 2026
Reviewer name: Sid
3 out of 5 stars
3 out of 5 stars review

Good product with some quality control issues

Usually, it's a great product that I buy once or twice a month but the container I opened today appeared to contain some black flakes. At first, I thought it was fungus, but they were solid. I'll probably buy this product again as I haven't seen this before but between the recent price hike and this, it was a disappointing experience this time around.

Helpful?70GIW7NABGMB16150765564
Aug 19, 2026
Reviewer name: anonymous
1 out of 5 stars
1 out of 5 stars review

This product has a bunch of stuff added to it. I buy what appears to be the exact same product from a different store and it only has the protein and one or two other ingredients. It's should be somewhere on the front of the container indicating that it is two different products.

Helpful?70GIW7NABGMB16150765564
Sep 11, 2025
Reviewer name: Maureen
1 out of 5 stars
1 out of 5 stars review

Same name but different ingredients

I normally buy this item from another store - it is the same brand and same exact name. The ingredients are different, however. The version from the other store has only 2 ingredients - whey protein isolate and sunflower or soy lecithin. This version has a whole laundry list of ingredients! And I can absolutely taste the difference, this one is gross.

Helpful?70GIW7NABGMB16150765564
Mar 14, 2026
Reviewer name: anonymous
1 out of 5 stars
1 out of 5 stars review

Adds a Horrific Taste to Everything!

I wanted an unflavored protein to add to my delicious smoothies and milkshakes however, this protein powder has add a horrid taste that I can't even describe to every milkshake and smoothie! I would never buy this product again it adds a milky horrid taste. Makes all my delicious smoothies and milkshakes un-drinkable!

Helpful?70GIW7NABGMB16150765564
May 6, 2026
Reviewer name: anonymous
1 out of 5 stars
1 out of 5 stars review

Ripoff!!!

This is 100% rip off. It may be quality protein, but it's twice the price for half as much as the nasty flavored stuff that's full of garbage. there's better stuff available at a much better price elsewhere.

Helpful?70GIW7NABGMB16150765564