Powered by CellOnePro™

The future of protein is here.

25 g of complete protein in every scoop, from CellOnePro™, a new kind of protein made by fermentation. Creamy like the shake you know. Made without a drop of whey.

  • 30-day returns
  • Made in the USA

Saccharomyces cerevisiae, the yeast behind CellOnePro™

ISO KING Chocolate Chunk tub

Saccharomyces cerevisiae, the yeast behind CellOnePro™

  • 25GProtein per scoop
  • 9/9Essential amino acids
  • 0Dairy0 lactose, made without whey
  • $39.99Per 2 lb tub

8x Mr. Olympia. Proprietary, patent-pending CellOnePro™. Made in the USA. Since 2011.

The CellOnePro™ story

We didn't compromise. We innovated.

  1. 1

    We saw it coming.

    Everybody wants more protein, and whey keeps getting harder to source and more expensive. Some brands answered with compromise. We went looking for a better way.

  2. 2

    About 18 months of research.

    We set three rules: quality, flavor, fair price. Many options passed one or two. We kept looking until one passed all three.

  3. 3

    The breakthrough: CellOnePro™.

    Ancient biology. Modern technology.The future of protein.

Ronnie Coleman in a blue RC polo, seated in front of the lit RC logo
Ronnie Coleman, 8x Mr. Olympia

Where protein comes from

There are three ways to make protein.

  1. A glass of milk, two eggs and a raw steak on paper
    01

    Animals

    Milk, eggs, meat. The classic sources, tied to farms and herds, and to the dairy supply.

  2. Bowls of soybeans, rice and split peas with a pea pod
    02

    Plants

    Soy, peas, rice. Extracted from crops, tied to fields and harvests.

  3. CellOnePro™
    Yeast cells, close up
    03

    Single cells

    Protein-rich yeast, cultivated under controlled conditions and grown by fermentation. Not dependent on dairy production or agricultural harvests. This is CellOnePro™.

No dairy farm. No crop field. A controlled fermentation.

Bread, wheat, grapes and a glass of beer beside an ISO KING tub and a shaker, a steel fermentation tank behind

Ancient biology

The yeast behind your bread. Rebuilt as protein.

CellOnePro™ starts with Saccharomyces cerevisiae, the same species of yeast people have used for thousands of years to bake bread and brew. It is not ordinary baker's yeast: controlled fermentation and advanced processing turn it into a concentrated, high-quality protein.

  1. Bread & brewingFor thousands of years
  2. FermentationA trusted process
  3. TodayComplete protein in your shaker

How CellOnePro™ is made

From yeast to scoop in 4 steps.

  1. Rows of steel fermentation tanks
    1

    Ferment.

    Selected Saccharomyces cerevisiae yeast is cultivated in a carefully controlled fermentation environment. The yeast grows and produces cellular material naturally rich in protein and amino acids.

  2. Yeast cells, close up
    2

    Open.

    Advanced processing opens and breaks down the yeast's cellular structure, making the protein inside accessible for extraction and refinement.

  3. A gloved hand holding a beaker of protein in a lab, a sieve and a scale on the bench
    3

    Purify.

    Specialized separation and purification remove unwanted non-protein components and concentrate the valuable protein fraction.

  4. A scoop of ISO KING going into a shaker beside the tub
    4

    Refine.

    The protein is tailored to its job. For ISO KING, a grade built for smooth, creamy shakes. For ISO KING CLEAR, an extra step of hydrolysis breaks it into smaller peptides for a clear drink.

The result: a highly refined, animal-free protein, complete with all nine essential amino acids.

Not whey.Not plants.Not ordinary baker's yeast.

CellOnePro™ is proprietary, patent-pending protein technology. It is not ordinary baker's yeast: it is a sophisticated protein ingredient produced through controlled fermentation and advanced processing, a highly refined, animal-free complete protein. ISO KING and ISO KING CLEAR are the first Ronnie Coleman Signature Series products powered by it.

25 g of protein per scoop with all 9 essential amino acids, including 5.3 g of BCAAs 25G PROTEIN PER SCOOP 9 of 9 essential amino acids Leucine Isoleucine Valine Lysine Methionine Phenylalanine Threonine Tryptophan Histidine 5.3 G BCAAS

What's in the scoop

25 G. All nine.

Proteins are built from amino acids, and nine of them are essential: your body cannot make them in sufficient amounts, so they have to come from food. A complete protein delivers all nine. Every scoop of ISO KING does, without depending on dairy.

Three of the nine, leucine, isoleucine and valine, are the branched-chain amino acids, or BCAAs. They are part of the nutritional profile athletes look for when they choose a protein, and ISO KING has 5,300 mg per scoop.

Hide the full amino acid profileSee the full amino acid profile
  • Lysine2,400 mg
  • LeucineBCAA2,200 mg
  • ValineBCAA1,650 mg
  • IsoleucineBCAA1,450 mg
  • Phenylalanine1,330 mg
  • Threonine1,300 mg
  • Histidine600 mg
  • Methionine500 mg
  • Tryptophan400 mg

Total EAAs 11,830 mgTotal BCAAs 5,300 mg

120-130 caloriesunder 1 g sugar per scoop

Key benefits

  • 25g Complete Protein Per Serving
  • All 9 Essential Amino Acids
  • Supports Muscle Growth & Recovery
  • Dairy-Free, Lactose-Free & Vegan
  • Non-GMO & Cholesterol-Free
  • Powered by Innovative CellOnePro™ Technology

Featured ingredients

Powered by CellOnePro

CellOnePro™ Single-Cell Protein Isolate

Next-generation, complete protein derived from Saccharomyces cerevisiae, providing all 9 essential amino acids to support muscle growth, repair, and recovery.

ISO KING uses a CellOnePro™ protein grade selected for traditional shakes, where body, texture and mouthfeel matter.

Why you'll love it

Experience the future of protein! ISO KING delivers high-quality, complete protein to support muscle growth and recovery without whey, dairy, or lactose.

  • Creamy textureThe body and consistency of a traditional shake.
  • Rich, familiar flavorsFive of them, from churro to vanilla cake pop.
  • Everyday versatilityPost-workout, daily protein, smoothies.

Five flavors

Pick your king.

Same 25 g of complete protein in every flavor. Choose one and we set it in the order box for you.

  • Selected
    ISO KING Churro Sticks tub with churros and cinnamon sticks

    Churro Sticks

    Warm cinnamon-sugar churro flavor. A dessert-style shake after training, or blended with milk and ice.

    • 120 kcal
    • 34 g scoop

  • Selected
    ISO KING Chocolate Chunk tub with dark chocolate pieces and cocoa

    Chocolate Chunk

    Rich, deep chocolate made with real cocoa powder. The classic post-workout shake, and great blended with milk or banana.

    • 130 kcal
    • 39 g scoop

  • Selected
    ISO KING Light Weight Latte tub with an iced latte and coffee beans

    Light Weight Latte

    Smooth coffee-house latte flavor made with real instant coffee. Your morning coffee and your protein in one shake.

    • 120 kcal
    • 36 g scoop

  • Selected
    ISO KING Aint Nothin but a Peanut tub with peanuts and peanut butter

    Aint Nothin but a Peanut

    Roasted peanut flavor made with real peanut powder. Great on its own, or blended with banana and milk.

    • 120 kcal
    • 34 g scoop

    Contains peanut

  • Selected
    ISO KING Vanilla Cake Pop tub with cake pops and vanilla pods

    Vanilla Cake Pop

    Sweet vanilla cake pop flavor, like a frosted birthday treat. Smooth on its own, and an easy base for smoothies.

    • 120 kcal
    • 33 g scoop

Your day, your shake

One shake. Every routine.

  • A man drinking an ISO KING shake on a gym bench, Chocolate Chunk tub beside him
    After the lift.
  • A woman adding a scoop of ISO KING to a smoothie in her kitchen
    In your morning smoothie.
  • A woman drinking a shake in the gym, ISO KING tub on a plyo box
    After a heavy set.
  • A man pouring water into a shaker in a locker room, peanut flavor tub on the bench
    Before training.
  • A woman drinking an ISO KING shake in her garage gym, Light Weight Latte tub on the bench
    After the morning run.
  • A woman shaking an ISO KING shake in her kitchen, Churro Sticks tub on the counter
    Whenever a shake fits your day.

Ronnie Coleman Signature Series

The king stands behind it.

8x Mr. Olympia, 1998 to 2005. He put his name on Ronnie Coleman Signature Series in 2011 to make supplements for people who actually train. ISO KING is the first protein in the line built on CellOnePro™.

Earned, not claimed.Yeah Buddy!

  • Ronnie Coleman in the gym holding ISO KING Chocolate Chunk
  • An ISO KING Chocolate Chunk tub on a weight plate in a dark gym
  • Ronnie Coleman seated in the gym with an ISO KING tub

How to use

Scoop. Pour. Shake. Go.

Adjust the water to the thickness you like. Enjoy after training or whenever a shake fits your day, alongside a balanced diet and exercise.

  1. Hands scooping ISO KING into a shaker beside the tub

    Scoop

    1 scoop.

  2. Pouring cold water into the shaker beside the tub

    Pour

    8 oz of cold water.

  3. A man shaking the shaker bottle in his kitchen

    Shake

    Shake 20 to 30 seconds.

  4. A man drinking the shake with a gym bag on his shoulder

    Go

    Drink up and go.

One technology, two experiences

Creamy or clear?

You're here
ISO KING Vanilla Cake Pop tub with cake pops and vanilla pods

Creamy

ISO KING

Rich, smooth, creamy. After training or whenever a shake fits your day.

2 lb · 27-28 servings · $39.99

Three ISO KING CLEAR tubs with lemons, berries and apple slices

Clear

ISO KING CLEAR

Light, fruity, refreshing. Made for sipping during training and active moments.

20 servings · $49.99

See ISO KING CLEAR
Feature ISO KING ISO KING CLEAR
Experience Rich, smooth, creamy Light, fruity, refreshing
Best for After training or daily During training and active moments
Format Creamy CellOnePro™ grade Hydrolyzed clear grade with electrolytes
Protein 25 g, all 9 EAAs 25 g, all 9 EAAs

The difference is the experience, not our commitment to quality.

The full label

Nothing hidden.

ISO KING Churro Sticks, 2 lb tub

Churro Sticks

2 lb · about 28 servings · 34 g scoop · 25 g protein

Other ingredientsSingle Cell Protein Isolate (from Saccharomyces cerevisiae as CellOnePro®), natural and artificial flavors, salt, sucralose, gum blend (xanthan, carrageenan, gum arabic).

Supplement Facts

Serving Size: 1 Scoop (34g)
Servings Per Container: About 28

NutrientAmount per Serving% DV
Calories120
Total Fat0.5 g1%*
Total Carbohydrate<1 g<1%*
Dietary Fiber0 g0%*
Total Sugars<1 g†
Protein25 g50%*
Iron0 mg0%
Sodium275 mg12%
Potassium50 mg1%
Single Cell Protein Isolate25 g†

* Percent Daily Values are based on a 2000 calorie diet
† Daily Value not established

Made in the USA with worldwide ingredients. · Must be 18 years of age or older to purchase and/or use this product. · *These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent disease.

The offer

Premium protein. Under $40.

Brand new for 2026. Be one of the first to try it.30-day returns · Made in the USA

All five ISO KING flavors in a row with their ingredients
  • Quality, never compromised
  • Flavor you'll love drinking
  • Value: premium protein, made accessible

Consumers should not have to choose between nutritional quality and a product they genuinely enjoy drinking.

FAQ

About the product

What is CellOnePro™?

CellOnePro™ is proprietary, patent-pending single cell protein technology. It starts with Saccharomyces cerevisiae, a protein-rich yeast, cultivated in a controlled fermentation. Advanced processing opens the cells, separates and concentrates the protein, and refines it for its job. The result is a highly refined, animal-free protein with all nine essential amino acids.

How is ISO KING different from other protein powders?

Most protein powders are made from milk (whey) or from plants such as soy, peas and rice. ISO KING comes from a third source: single cells. Its protein, CellOnePro™, is grown by fermentation, so it does not depend on dairy production or agricultural harvests. You still get what you expect from a shake: 25 g of complete protein, a creamy texture and rich, familiar flavors.

Is ISO KING whey protein?

No. ISO KING is made with CellOnePro™, a single cell protein isolate from yeast (Saccharomyces cerevisiae), grown by controlled fermentation. It is not whey and not from milk, and it is lactose free.

Is it just baker's yeast?

No. CellOnePro™ starts with the same species of yeast people have used for thousands of years to bake bread and brew, but it is not ordinary baker's yeast. It is a sophisticated protein ingredient: controlled fermentation and advanced processing turn it into a concentrated, high-quality protein.

What's the difference between ISO KING and ISO KING CLEAR?

Both are powered by CellOnePro™ and give you 25 g of protein with all nine essential amino acids per serving. ISO KING uses a grade selected for creamy shakes, for after training or any time of day. ISO KING CLEAR uses a hydrolyzed grade with added electrolytes for a light, fruity drink you can sip while you train. The difference is the experience, not our commitment to quality.

Use and taste

Will it taste like a real protein shake?

It was built to. ISO KING uses a CellOnePro™ grade selected for traditional shakes, where body, texture and mouthfeel matter, in five rich, familiar flavors: Churro Sticks, Chocolate Chunk, Light Weight Latte, Aint Nothin but a Peanut and Vanilla Cake Pop.

When should I drink it?

Whenever a shake fits your day: after training, with breakfast or between meals. Use it as part of a balanced diet and exercise program.

Can I use it in smoothies?

Yes. ISO KING is made for everyday versatility: post-workout shakes, daily protein and smoothies. Blend one scoop with your milk, fruit and ice.

How do I mix it?

Add 1 scoop to 8 oz of cold water in a shaker bottle and shake for 20-30 seconds. The steps are in How to use above.

Buying

Which size should I pick?

The 2 lb tub ($39.99) holds 27 to 28 servings, depending on the flavor, and is an easy way to try a flavor. The 5 lb tub ($99.99) holds 65 to 69 servings, so you restock less often. Every serving is one scoop with 25 g of protein.

How fast does it ship?

We are located in Lake Mary, Florida and ship everything direct from our HQ.

Does it contain allergens?

Read the label of your flavor before use. Aint Nothin but a Peanut is made with peanut powder and contains peanut.

Is it vegan?

Yes. The label lists ISO KING as vegan, lactose free and cholesterol free.

Who is it for?

Adults who train and want more complete protein in their day, including people looking for a dairy-free protein. You must be 18 years of age or older to purchase and/or use this product.

General

Do your products contain stimulants?

Some products may contain stimulants and some may not. Please review the product label and supplement facts panel before use.

Can I use your supplements if I am under 18?

You must be 18 years of age or older to purchase and/or use this product.

How should I use your products?

Please follow the directions on the product label. Do not exceed the recommended serving size unless advised by a qualified healthcare professional.