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Customer reviews for ISOPURE Whey Protein Isolate, Unflavored, 1.55 lbs. for
ISOPURE Whey Protein Isolate, Unflavored, 1.55 lbs.
4.4 out of 5 stars
stars
120 ratings116 reviews
  1. 5 stars59% (71)
  2. 4 stars28% (34)
  3. 3 stars8% (10)
  4. 2 stars1% (1)
  5. 1 star3% (4)

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Showing 1-10 of 116 reviews
Nov 10, 2025
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
Oct 17, 2025
Beth J
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Great product!

I've been using Isopure Unflavored protein powder for a couple of years. It dissolves easily into beverages (I add it to my chai) and I like adding it to my smoothies, Greek yogurt and oatmeal as a way to get extra protein. I also love the large package size which means less ordering + less packaging waste!

Review from Glanbia Performance Nutrition, Inc.
Helpful?70GIW7NABGMB16150765564
Mar 20, 2026
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 16, 2026
AnaG
5 out of 5 stars
5 out of 5 stars review

Taste great

[This review was collected as part of a promotion.] This protein powder mixes easily and is a good source of protein without adding sugar or carbs to my day. I love how easy it is to incorporate it into my day. I also love that there isn't a very distinctive taste.

Review from influenster.com
Helpful?70GIW7NABGMB16150765564
Feb 12, 2026
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
Dec 29, 2025
Ariel
4 out of 5 stars
4 out of 5 stars review

A for effort but doesn't always hit the mark

I'm still trying to figure out if i like this product. Although it's "flavorless", when it's added to anything plain it gives a horrible taste in my opinion. I think in a homemade protein smoothie it would be okay but i would put it in a mason jar with a cold liquid and shake really well before adding it even to a blender. It clumps very easily....anyone saying it mixes with ease is probably sponsored by this product. LOL :P I added it to hot coffee and used a frother which just made it clump and curdle. The product itself seems great as far as ingredients but definitely takes a little figuring out to find something it's good in . I was hoping i could just add it to almond milk or coffee and be good to go but it's definitely not that simple unfortunately.

Helpful?70GIW7NABGMB16150765564
Jan 18, 2026
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
Jun 7, 2026
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
Sep 11, 2025
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
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