24/7 Customer Service 1-866-236-8417 Need Help? 1-866-236-8417



With ActiNOS And VAT-Burn!

Build Muscle, Lose Fat, and Promote Nitric Oxide!*

Overall Rating

Out of 10
Read 127 MRI Pro-NOS Reviews.

First came whey. Then whey isolates. Now you have isolate "Fractions"! Fractions are tiny segments of isolates (1 part in 2,000). The Actinos fraction of Pro-NOS promote nitric oxide levels.* The VAT-Burn fraction promote fat loss.* And they both supply you the aminos to build muscle.*

Build More Muscle - Faster*

Your muscle growth depends on two factors: 1) how many aminos you can deliver to your muscle cell and, 2) how long you can keep the process of constructing new muscle (protein syntheses) cranking. With Pro-NOS, you do both - at the same time!* You see the whey fractions you find in Pro-NOS not only provide your body with the best muscle-building amino acids you can find, but they also promote increased nitric oxide.*

Increase Nitric Oxide*

Now you can boost your nitric oxide levels - without taking extra arginine!* That's with whey and only whey. You see, the Actinos fraction of Pro-NOS has been surmised to support the NOS enzymes that make nitric oxide out of arginine!*

Multi-Fractioned Whey Isolate Complex

  • Increases Mass-Building Amino Delivery*
  • Amplifies Nitric Oxide Levels*
  • Support Fat Burning*
  • 42 Grams of Protein Per Serving
  • From the creators of NO2 & CE2!


  • NO Amplifying Whey Isolate
  • VAT-Burn Fat Reducing Whey Isolate*
  • Ed Byrd's Revolutionary New Whey!
  • The Physique-Altering Power of Peptide "Multionarion"*

Pro-Nos gives you the power to gain muscle and burn fat.* Without added ingredients. Just protein. Here's how:

What Makes Pro-NOS Different?

The stunning new technology is known as peptide "multi-fractionation." Unlike today's whey proteins that use peptide chains in their "randomly occurring" length, MRI has isolated the specific "interval" (length) within the peptide chains that holds all the concentrated power to change your body composition!* You get two powerful physique-altering chain-length specific peptides in new Pro-NOS: ACTINOS increases nitric oxide.*

Build Muscle and Burn Fat - At the Same Time - With Fractionated Whey!*

Chest. Arms. Abs. With Pro-NOS, you get it all. The patent-pending NO-generating whey peptide fraction (ACTINOS) amplifies nitric oxide levels.* Without arginine or "added ingredients." Just fractionated whey protein.

Pro-NOS Is Ideal To Take With All NO-Generators!

Pro-NOS is designed to work synergistically with all nitric oxide products. You see, NO generators provide your body with arginine - the building block of NO. Pro-NOS makes sure you've got enough NOS enzymes. But it's the NOS enzymes that convert the arginine into nitric oxide. Finally, NOS is no-longer the rate-limiting factor in NO production! With Pro-NOS, you get 42 grams of high-quality whey isolates and concentrate! And it tastes great!

By amplifying the number of enzymes that convert arginine into nitric oxide, the "Actinos Fraction" has been suggested to increase nitric oxide levels.*

Your body has an enzyme called "Nitric Oxide Synthase" (NOS). That enzyme converts the arginine you supplement - or ingest - into nitric oxide. The problem is, you have a limited number of NOS enzymes - restricting the amount of nitric oxide your body can produce. Now see how the "Actinos Fraction" of Pro-NOS increases NOS, giving you the potential for "unlimited" nitric oxide production.* In fact, studies prove the Actinos Fraction amplifies nitric oxide.*

Unleashing the "Primal Force" Locked Inside of Whey Isolates!

"We've cracked the elusive protein code!" says Ed Byrd, MRI's innovative CEO. "We've identified, and 'cleaved off,' the tiny, body-altering peptide "fractions" locked within whey isolates. These small fractions give you ability to rapidly build muscle, burn fat, and increase nitric oxide - with whey fractions only!* We've discovered the first genuine bodybuilding protein! We call it Pro-NOS. Welcome the new era in protein supplementation!"

The Power of "Fraction" Technology

How can the small fractions in Pro-NOS give you such huge results? Simple. You see, all whey isolates come in peptide "chains." Ordinary whey isolates, like you find in today"s whey products, occur in long "random" chain lengths. They may help supply your body with aminos - but do little more. Now observe the Pro-NOS difference! The Pro - NOS Fraction Technology identifies, and 'cleaves off,' the two tiny 'specific' fractions that help you build bigger, thicker muscles fast - then go way, way beyond!* The Actinos fraction of Pro-NOS is clinically proven to amplify nitric oxide synthase enzymes!* All this, with whey fractions only!

{{product.overallRating || "--"}} OVERALL
Out of 10 Rate This!
{{product.brandName}} {{product.name}} Reviews {{reviews[false].total||0 | number }} {{reviews[false].total | sufix: 'TOTAL RATINGS':'TOTAL RATING':'TOTAL RATINGS'}} REVIEW THIS PRODUCT
  • VERIFIED BUYER RATING {{product.verifiedBuyerRating || "--"}} {{reviews[true].total || 0 | number}} {{reviews[true].total | sufix: 'RATINGS':'RATING':'RATINGS'}}

  • AVERAGE FLAVOR RATING {{product.overallRating || "--"}} {{product.flavorList.length || 0}} {{product.flavorList.length | sufix: 'FLAVORS':'FLAVOR':'FLAVORS'}}

  • {{rate.rating || "--"}} TOP RATED FLAVOR {{rate.flavor || "NONE" }}

By clicking the button above, you agree to entering the Bodybuilding.com Reviews section. Products in the Store are not intended to diagnose, treat, cure, or prevent any disease.
  • VERIFIED BUYERS ONLY ({{reviews[true].total || 0 | number}})
  • ALL REVIEWS ({{reviews[false].total || 0 | number}})

MRI Pro-NOS Purchase Information

Order today using our 100% secure server and get it at the lowest prices in the world with our fast, inexpensive 2-3 day shipping! NOBODY beats our overall price!

Free Item
3 Lbs. $54.99 $32.98
Flavor Taste Availability  
Banana Cream
9.0 In Stock
Dutch Chocolate Royale
9.0 In Stock
French Vanilla Creme
9.0 In Stock

Recommended For You

Do You Use This Product?

Add To Your BodySpace

Free Item
3 Lbs. $54.99 $32.98
Flavor Taste Availability  
Banana Cream
9.0 In Stock
Dutch Chocolate Royale
9.0 In Stock
French Vanilla Creme
9.0 In Stock
What's in MRI Pro-NOS?
3 Lbs.Banana Cream
Supplement Facts
Serving Size2Scoops(75g)
Servings Per Container18
Amount Per Serving
Calories From Fat70
Amount Per Serving% DV*
Total Fat8g12%
Saturated Fat3g15%
Trans Fat0g
Total Carbohydrate19g6%
Dietary Fiber<1g3%
Vitamin A4%
* Percent Daily Values (%DV) are based on a 2,000 calorie diet
Other Ingredients
MRI Proprietary Whey Blend, MRI Sunflower Oil/MCT Blend (Sunflower Oil, Corn Syrup Solids, Sodium Caseinate [A Milk Derivative], Mono- And Diglycerides, Di-Potassium Phosphate, Tri-Calcium Phosphate, Soy Lecithin, Tocopherols), Natural And Artificial Flavors, Cellulose Gum, Artificial Colors, Sucralose, Acesulfame Potassium (Ace-K), MCT Oil Powder (Medium Chain Triglycerides [MCT]), Nonfat Dry Milk, Di-Sodium Phosphate, Silicon Dioxide
Allergen Statement:
This Product Contains Ingredients Derived From Milk And Soy.

Directions For Pro-NOS: Mix 1 serving (2 scoops) of Pro-NOS with 12 fl. oz. of cold water or skim milk, mix well. Consume immediately. Take 2 servings of Pro-NOS daily.
Note: On training days, take one of your two daily servings within one hour after your workout.

* 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.
Adding Item to Cart
{{data.errorMessage || 'An error has occurred, please try again.'}}
Item Added to Cart!
{{data.product.brand}} {{data.product.name}}
Quantity: {{data.product.quantity || 1}}
Keep Shopping
See subtotal, shipping & promotions in cart.