Blue Star Nutraceuticals


Protein Shake for Lean Muscle*
Supports Muscle Recovery From Exercise*
9.7  out of 10  (99 Reviews)
2 Sizes
2 Lbs.
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2 Flavors
Chocolate Sin
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Price: $44.99  ($1.80 / Serving)
Flavor Rating: 9.3

Product Overview


Not Cheap. Never will be.
Blue Star Nutraceuticals Post-Factor bottle

Support Recovery*

Tastes Great

Build Muscle*

Athlete working out in the gym
The past, present
and future of protein

Protein – a word synonymous with strength, power, and physique. We look for it on labels. We worry when it’s missing. These days, food manufacturers are adding it to everything they produce and slapping giant stickers on the front of their packages, “Now With Protein!” And yet somehow it seems, as its popularity is soaring, its quality is not. Quite the opposite in fact. Indeed, protein is everywhere – and so much of it is absolutely awful.

So what are we to do in a time when the performance athlete’s most coveted supplement has become nothing more than marketing ploy...

This is Iso-Smooth™. The past, present, and future of protein.

It's all about the isolate.

Protein is almost everywhere. But performance-level whey protein isolate for performance-level athletes is only in Iso-Smooth™.* Whey protein is created when the components of milk are mechanically separated.

This whey protein can be further processed to yield three forms: whey protein isolate, whey protein concentrate, and whey protein hydrolysate. The difference between these three forms is their percentage of pure protein.

After one serving of Iso-Smooth™ you’ll understand why not all protein is created equal.

Inside Blue Star Nutraceuticals Post-Factor bottle
Man drinking from blender
Pure protein, to the power of four.

Iso-Smooth™ forever changed the way we use protein. Its four-stage sustained-release blend of whey protein isolate, milk protein isolate, egg protein isolate, and micellar casein steadily delivers protein to your muscles as you need it, not all at once.* The result? A single-serving protein that provides up to eight full hours of muscle fuel, regardless of how or when you take it.*

Absorption and the PDCAAS.

Protein digestibility-corrected amino acid score (PDCAAS) is a method of evaluating protein quality that measures the amino acid requirements of humans and their digestion abilities.

Proteins are rated from 0 to 1.00, where 0 represents the lowest rating and 1.00 represents the highest rating.

All four proteins in Iso-Smooth™ have a PDCAAS value of 1.00.

Whey protein isolate.

Absorbed for up to 2 hours
PDCAAS Score: 1.00

Egg protein isolate.

Absorbed for up to 4 hour
PDCAAS Score: 1.00

Milk protein isolate.

Absorbed for up to 5 hours
PDCAAS Score: 1.00

Micellar casein.

Absorbed for up to 8 hours
PDCAAS Score: 1.00

Man stretching.
It has no business tasting this good.

“Remarkable.” “Incomparable.” “Luxurious.” These words, more often associated with German sedans than protein flavors, are just a few of the accolades awarded to Iso-Smooth™. Quality over quantity. Fundamentals over fads. These are the guiding principles of the Iso-Smooth™ flavor team. After 25 years of combined experience, it’s safe to say you know a thing or two about flavor-making. The result? Iso-Smooth™ flavors aren’t just good – they’re award-winning.

Regardless of your go-to recipe, Iso-Smooth™ is the only protein you need.* So whether you’re a yogurt, peanut butter, banana, or kale kinda guy, you won’t find a cleaner, better tasting protein out there. Thick, creamy, and ice cold, Iso-Smooth™ is the only way to reward yourself at the end of every workout.*

Chocolate candies
Betty By Design
Real products from real people.

"When looking for a high protein supplement to promote lean muscle growth and recovery, the most important characteristic is purity. Not all protein products are equal in purity. You can assess the purity of a protein supplement by looking for the word ‘Isolate’ in the ingredient list. Only Iso-Smooth™ has 3 different types of protein isolates indicating the highest purity of protein of all protein supplements with zero grams of sugar."*

Blue Star Nutraceuticals Chief Scientific Officer, David Gundermann.
David Gundermann
Chief Scientific Officer, Blue Star Nutraceuticals

Ph.D., Nutrition & Metabolism, University of Texas Medical Branch
M.Sc. Human Performance, University of Florida

Blue Star Nutraceuticals - Better By Design.

Ratings & Reviews

Overall Rating
99 Ratings
Verified Buyer Rating
37 Ratings
Average Flavor Rating
2 Flavors
Top Rated Flavor
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.

With 30g of protein, it is at the high end side of protein content. Most protein powders i see usually have 24-26g protein. 30 is much better, and the extra 6-4g protein per scoop really adds up and makes it easier to hit your goal for the day. Plus, at 1g carb, 1gfat, and 0g sugar, it is definitely on the cleaner side of most protein powders. As for the protein source, ISO-Smooth is made up of a mix of whey, milk, egg and micellar protein isolates. Not sure if anyone else is aware, order to evaluate protein quality, protein powders are given a PDCAAS (Protein digestibility-corrected amino acid score), which is a method of evaluating protein quality that measures the amino acid requirements of humans and their digestion abilities.. Proteins are rated from 0 to 1.00, where 0 represents the lowest rating and 1.00 represents the highest rating. All four proteins in Iso-Smooth have a PDCAAS value of 1.00. that we know that we are dealing with a high quality protein, you might be wondering how it tastes.... Well, it tastes just as the name is a dream....a Vanilla Dream. In water, or milk, it tastes equally as good. In milk, it is obviously a little thicker. Funny thing, is that i usually like my protein mixed in water...but i almost preferred it mixed in water when it came to the iso-smooth. No jokes, i would give this protein a perfect 10/10 rating on all accounts..profile, flavor, mixability. Although it might be a little expensive for some..but as the age old saying goes, "you get what you pay for"


This isn't your average ISO that is for sure, you get FOUR different Isolates in one blend, none of which I have seen in another product.. Most Isolates mix up to be a watered down disappointment without giving you much satisfaction. Iso smooth has some added fats and thickeners to give you a well rounded shake that makes you feel satisfied. The flavor has a hint of Carmel IMO to give it a backbone to the flavoring system to live up to the name CHOCOLATE SIN! only 1 gram of fat no sugar 30 grams per scoop of protein.......30!!!!! The only drawback and this has been said over and over in reviews.....the cost! The old adage .."You get what you pay for" very solid!!! 9/10

  • 8 Vanilla Dream

Gym God and Blue Star Nutraceuticals were incredibly generous and hooked me up with a 2lb tub of their ISO-SMOOTH in the 'Vanilla Dream' flavor. I have tried many of the Blue Star products and have liked them all so trying their ISO-SMOOTH was a no brainer. Mixability: I have tried it in the following mixutres: 1. Water – It mixes well and I found about 7 ounces to be the sweet spot for me 2. Milk – Here I went with about 10 ounces of milk (Fairlife) otherwise it was pretty thick 3. Milk and Egg Whites – ¾ cup of egg whites (Kroger) and 6 ounces of milk (Fairlife) Now the fluffiness of the powder seems to make it a little frothy, but I don’t mind it at all Taste: Taste of the Vanilla was very good, not the best but still very good. My favorite was mixing it with Fairlife Non-Fat Milk and I even mixed it with 2% Fairlife Chocolate Milk, both came out excellent. Cost “Not Cheap and Never Will Be”, says it all right on the label. It is a little more expensive than other ISO proteins but they have very good products so a lot of people will look pasted this.

  • 10 Vanilla Dream

Bravo to the Blue Star formulation team for this superb product. If you've seen my posts on the boards, I am always honest when it comes to my opinion on certain supps and will call BS out if deserving. I can say with 100% confidence that this is one of the best isolates I have tried to date, based on the profile/taste/everything else.

  • 10 Chocolate Sin

okay.....WHAT! This thing is unbelievable. It reminded me right away as having sweet chocolate chips, ones people would use for baking. Im a huge fan of chocolate and especially dark chocolate is a little weakspot for me. And when I took of sip of this, it got my tastebuds going crazy. Smooth, just like its name, and tastey. Most importantly, no weird after taste. The worst part is when it was done

  • 10 Chocolate Sin

Wow, I mean Wow! This is the best protein I have ever had. The chocolate is amazing in taste, almost unbelievable that it doesn't have a little bit of chalky taste, but it does not. I will continue to buy my products from you

Verified Buyer
  • 10 Vanilla Dream

By far the BEST protein I have used yet and I have tried many since 2011. Mixes well, tastes great, and just flat out WORKS. No, it's NOT cheap, but is well worth it. I was very skeptical at first. The protein percentage is highest of any other protein out there and this has been independently tested and verified. Also, with regards to the higher costs keep in mind that most protein makers have gone to the 4lb jug and this is a 5lb jug. So some of the extra $$$ are because you're getting more. I have tried both the Vanilla and Chocolate Sin and they both taste great. I prefer the Vanilla only because you can mix more with it such as fruit. But at any given time there always a jug of each in my kitchen. HIGHLY Recommend.

  • 9 Chocolate Sin

Reminds of me a light hot chocolate taste, very very light chocolate taste and not overpowering, could use a bit more chocolate taste. Great profile and very high quality proteins, also has added enzymes and more. Virtually lactose free makes this great Overall great protein..easy on the stomach, no GI issues or bloating, taste is good for an Isolate and GREAT macros. Downfalls are a slightly high price tag but well worth the quality! Would recommend this protein.

Verified Buyer

Best protein I've ever tried. Perfect flavor and mix of nutrients

Verified Buyer
  • 10 Vanilla Dream

I love this product it's the best I like vallia because it mixes great with water or coconut milk I add fruits to it i love the taste and my body is more firm more tone really works thanks !!!

Verified Buyer
  • 10 Vanilla Dream
  • 10 Chocolate Sin

Remember as a kid waking up before sunrise so you wouldn't miss watching saturday morning cartoons? i remember my mom would always prepare a good breakfast with a glass of chocolate milk. The very first time I tried Iso-Smooth my world was rocked, as I was thrown back to my childhood remembering the taste that every chocolate drink should aspire to be. No more being forced to add some sort of syrup or large amounts of ice to drown or mask chemical flavors. No more pulling out an industrial strength blender just to make sure no powder balls would rise to the top and explode in my eye or cause a powdery ball that'd make me choke. Finally a protein shake that tastes great, mixes well and easily, and doesn't skimp out on purity. If ever you could make a complaint about it, it'd only be that if it goes on sale you'd better hurry before supplies run out.

  • 7 Chocolate Sin

Like the label says it's not cheap and you can see why. It has high protein at 30g per scoop and little fat and little carbs, the macros you'd expect out of a great isolate. It mixes well and tastes good. I was hoping for a little more creamier taste, but not a huge issue. You're getting what you pay for with Iso-Smooth. Top notch.

Verified Buyer

Absolutely great product. I take about a scoop a day, and it works. Low calories, low carbs, and high protein. Works as a fat burner as well! It's not cheap, but it's an amazing product.

  • 10 Vanilla Dream

WOW!!! I am super impressed by this protein! Great taste,super-easy mixability,and nothng but the best protein isolate around!!! Iso-Smooth can be mixed with minimal water/milk and leave no clumps at can be cooked with easily as well...all in all this is easily the best protein around...the only problem i could find with it was the price,but as with anything else if you want the best you have to pay for it,and this is far and away the best protein I have ever had the pleasure of trying!!!

2 Lbs.
2 Lbs.
25 Servings | $1.80 Per Serving
5 Lbs.
5 Lbs.
63 Servings | $1.43 Per Serving

What's in Blue Star Nutraceuticals Iso-Smooth

2 Lbs. Chocolate Sin
serving size: 1 Scoop (approx. 36 g)
Servings Per Container25
Amount Per Serving
Calories 135       
Calories from Fat 10       
% Daily Value
Total Fat 1 g 1%*
Saturated 0 g 0%
+ Trans 0 g
Cholesterol 2 mg 1%
Total Carbohydrate 1 g 1%*
Dietary Fiber .6 g 1%*
Sugars 0 g
Protein 30 g 60%*
Calcium 160 mg 16%
Iron 1 mg 4%
Phosphorus 100 mg 10%
Magnesium 36 mg 9%
Zinc .3 mg 2%
Copper 80 mcg 4%
Chloride 68 mg 2%
Sodium 70 mg 3%
Potassium 255 mg 7%
* Percent Daily Values are based on a 2,000 calorie diet
† Daily Value Not Established
Cold Processed Time Released Protein Matrix (Whey Protein Isolate, Milk Protein Isolate, Egg Isolate, Micellar Casein), Cocoa Powder, Suspension Matrix (Xanthan Gum, Cellulose Gum, Carrageenan), Natural And Artificial Flavor, Sucralose, Acesulfame Potassium, Flaxseed, CLA, Enzyme Blend (Lactase, Bromelain, Amylase, Protease, Hemicellulase, Cellulase).
Allergen Warning: Contains ingredients from milk and egg. Made in a facility that also processes soy, peanut, tree nuts, fish, crustaceans and shellfish, and wheat products.

Directions For Iso-Smooth: As a dietary supplement, mix 1 scoop of ISO-SMOOTH with 8oz of water, milk, juice or your favorite beverage.

Warnings: KEEP OUT OF REACH OF CHILDREN. Not intended for use by persons under 18 years of age. Contains ingredients from milk and egg. Made in a facility that also processes soy, peanut, tree nuts, fish, crustaceans and shellfish, and wheat products. Consult a physician before taking this product if you are lactose intolerant or have any allergic reactions to dairy products. Use this product as a dietary supplement only. This product is not intended to replace food. Store in a cool dry place (60° F to 80° F). DO NOT USE IF SAFETY SEAL ON THIS PACKAGE HAS BEEN BROKEN.

* 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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