Arnold’s Ultimate Stack
30 Servings Per Container: $3.57/Serving
Complete daily foundation for strength, recovery, immunity and gut health
- Creatine fuels strength and training capacity*
- Fiber+ supports full-spectrum gut health*
- Together, they strengthen your foundation
Arnold’s core performance system. No shortcuts.
Four proven essentials designed to build lean muscle, increase power, strengthen bone and immune health, and support full-spectrum gut performance in one foundational daily stack.
Arnold’s Ultimate Stack:
Covering the critical systems that determine how well you train, recover, and perform. Each product in Arnold’s Ultimate Stack plays a distinct role, working together to build strength today and performance for life.
- Strength, power & cognitive output
Creatine Monohydrate helps regenerate ATP—the body’s primary energy source—to increase strength, power output, training capacity, and brain performance. - Lean muscle growth & recovery
Grass-fed Whey Protein Isolate delivers essential amino acids for muscle repair and maintenance, with ProHydrolase® enzymes to support digestion and absorption. - Bone density, muscle function & immune health
Vitamin D3 (2000 IU) enhances calcium absorption and supports skeletal strength, neuromuscular function, and immune resilience. - Full-spectrum gut support
Fiber+ combines soluble fiber, insoluble fiber, and prebiotic resistant starch to nourish beneficial bacteria, strengthen the gut barrier, and support metabolic stability.
Built to The Momentous Standard®
NSF Certified for Sport®, rigorously tested, and formulated without artificial flavors or unnecessary additives—designed for daily, long-term use.
Arnold’s Ultimate Stack works by strengthening the core systems that determine performance: muscle repair, cellular energy production, bone integrity, immune resilience, and gut health. Each ingredient plays a defined role—and together they create a compounding effect.
Here’s how it works:
Whey Protein Isolate delivers rapidly absorbed essential amino acids, including leucine, to directly stimulate muscle protein synthesis and accelerate repair after training.
Creatine Monohydrate increases phosphocreatine stores inside muscle cells, allowing faster ATP regeneration—the energy source for strength, power output, and high-intensity performance. Creatine also supports cognitive energy and mental clarity.
Vitamin D3 (2000 IU) enhances calcium absorption and neuromuscular signaling, supporting bone density, muscular contraction efficiency, immune regulation, and long-term resilience.
Fiber+ provides soluble fiber, insoluble fiber, and prebiotic resistant starch to nourish beneficial gut bacteria, improve digestive efficiency, and support nutrient absorption, metabolic balance, and steady energy.
Together, these systems don’t just “support” performance—they optimize the body’s ability to train hard, recover efficiently, and adapt over time.
Arnold’s Ultimate Stack is designed to be simple, efficient, and sustainable. Take each product once daily and adjust based on body composition, training load, and protein intake.
Momentous Creatine Monohydrate (5g daily)
Supports strength, power output, and brain performance.
- Start with 1 scoop once per day
- Mix with water or add to your protein shake
- Drink shortly after mixing (best within 30 minutes)
Whey Protein Isolate (1 scoop daily)
Delivers essential amino acids for muscle repair and growth.
- Take post-workout or anytime you need protein support
- Increase servings to meet your daily protein target
Vitamin D3 (2000 IU daily)
Supports bone density, muscle function, and immune health.
- Take 1 capsule daily;no food required
- Formulated with extra virgin olive oil (EVOO) to support absorption health.
Fiber+ (2 scoops daily)
Supports digestion, microbiome diversity, and metabolic stability.
- Mix with 12–16 oz of liquid
- Drink shortly after mixing (Fiber+ thickens the longer it sits)
- Can be added to your protein shake
How to Combine
- All products can be taken together
- Many mix Creatine + Fiber+ into their Whey for convenience
- Vitamin D3 can be taken alongside or separately
Consistency matters. Results build with daily, long-term use.
Pairs well with: Omega-3 for joint, heart, and inflammation support.
Whey Protein:
Chocolate: Grass-fed whey protein isolate, ProHydrolase®
Other Ingredients: Natural Flavors, Cocoa, Salt, Monk Fruit Extract, Stevia, Contains Milk
Vanilla: Grass-fed whey protein isolate, ProHydrolase®
Other Ingredients: Natural Flavors, Salt, Monk Fruit Extract, Stevia, Contains Milk
Unflavored: Grass-fed whey protein isolate, ProHydrolase®
Other Ingredients: Contains Milk
Strawberry: Grass-fed whey protein isolate, ProHydrolase®
Other Ingredients: Natural Strawberry Flavor, Reb M*, Beet Root/Carrot Juice Powder (For Color), Contains Milk
ProHydrolase® is a clinically researched enzyme that enhances protein breakdown and amino acid uptake.
Creatine: Creatine Monohydrate (Momentous)
Momentous Creatine is sourced from the purest form of creatine monohydrate ever. No additives, sweeteners, or other ingredients.
Vitamin D3 2000IU:
Vitamin D3 50mcg (2000 IU) (as plant-based cholecalciferol)
Other Ingredients: Organic Extra Virgin Olive Oil, Hypromellose (Capsule), Candelilla Wax
We include a high-quality fat source (organic extra virgin olive oil) in this product to aid in Vitamin D absorption even if taken without a meal or other fat source.
Fiber+:
Pure Cinnamon: Psyllium Husk, Resistant Potato Starch (Solnul®), Rice Bran Hull
Other Ingredients: Cinnamon Bark Powder, Sunflower Lecithin, Reb M*
Fiber+ combines three active ingredients to support complete digestive health:
Psyllium Husk: a primarily soluble fiber that supports gut regularity.
Rice Bran: an insoluble fiber that promotes consistent digestion.
Resistant Potato Starch: a prebiotic starch that fuels beneficial gut bacteria and promotes short-chain fatty acid (SCFA) production for gut barrier support.
*Reb M is a natural, plant-based sweetener with zero glycemic response or aftertaste. Our Reb M is made from fermated rice and is 250× sweeter than sugar without bloating, 2.5× sweeter than monk fruit, and made sustainably with less land, water, and crop rotation.
When to use:
Use Arnold’s Stack daily, whether you train that day or not. Consistency is key.
Onset time:
- Whey Protein: Begins supporting muscle repair immediately after use.
- Creatine: Cellular saturation typically occurs within 2–4 weeks of daily use.
- Vitamin D3: Blood levels build gradually, with measurable changes in 4–8 weeks.
- Fiber+: You may notice easier, more regular stools within 12–48 hours, with fuller microbiome and metabolic benefits building over 1–4 weeks of steady use.
Expected results:
With consistent use, you can expect support for strength, muscle recovery, gut health, and daily performance in the short term, with improvements in muscular resilience, bone health, and overall vitality developing over time. Long-term benefits are driven by daily adherence—not quick fixes.
There are 12 credible reviews and studies related to this product:
Whey Protein Isolate:
- Timing and distribution of protein ingestion during prolonged recovery from resistance exercise alters myofibrillar protein synthesis
- Whey protein isolate attenuates strength decline after eccentrically-induced muscle damage in healthy individuals
- Effect of whey protein supplementation on body composition changes in women: a systematic review and meta-analysis
Creatine:
- International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine
- Effects of creatine supplementation and resistance training on muscle strength and weightlifting performance
- Effect of creatine supplementation on body composition and performance: a meta-analysis
Vitamin D3:
- Sunlight and vitamin D for bone health and prevention of autoimmune diseases, cancers, and cardiovascular disease
- Athletic Performance and Vitamin D
Fiber+:
- Consumption of Solnul™ resistant potato starch produces a prebiotic effect in a randomized, placebo-controlled clinical trial
- The Health Benefits of Dietary Fibre
- The Importance of Dietary Fiber for Metabolic Health
- Association of dietary fiber intake with all-cause and cardiovascular mortality in U.S. adults with metabolic syndrome.
- 20g of clean protein per serving
- Limited-run flavors. No artificial sweetners
- NSF Certified for Sport®
Whey Protein Isolate - Flavor Series
Whey Protein Isolate - Flavor Series
- 20g of protein in travel-ready packets
- Supports daily protein intake
- NSF Certified for Sport®
Whey Protein Isolate 10-Travel Packs
Whey Protein Isolate 10-Travel Packs
- 1g of clinically proven creatine per chew
- Enhances cognitive function & ATP production
- Supports lean muscle growth, endurance, and recovery
Creatine Chews 150-Count
Creatine Chews 150-Count
- New Signature Spec creatine standard
- Ultrafine powder for exceptional mixability
- Unrivaled 6-stage testing & certification
Creatine 15-Travel Packs
Creatine 15-Travel Packs
- 6 clinically-studied ingredients that work together
- Targets core cell functions - beyond just NAD⁺
- Promotes brain function + DNA integrity
Longevity
Longevity
Frequently Asked Questions
Yes. Arnold’s Ultimate Stack reflects the full spectrum of supplements Arnold Schwarzenegger uses daily—fiber, protein, creatine, and vitamin D3—because they address the fundamentals of strength, muscle, and long-term performance.
Arnold’s Stack is designed for anyone focused on strength, muscle, and longevity—from serious athletes to everyday individuals of any age who want a simple, proven daily routine without trends or hype.
Yes. Consistent daily use is important. Fiber, Protein, creatine and vitamin D3 work by building and maintaining levels in the body over time, not just on training days.
Momentous Whey Protein Isolate is sourced from grass-fed, pasture-raised cows on European dairy farms that meet rigorous standards for animal welfare and product quality, including being free from hormones, steroids, and rBST.
The whey is cold-processed and micro-filtered to preserve its full amino acid profile while minimizing sugar, fat, and lactose. It’s also enhanced with ProHydrolase®, a clinically studied enzyme that improves digestion and amino acid absorption, helping reduce GI discomfort and maximize protein uptake.
Not necessarily. The idea that Vitamin D3 must always be paired with Vitamin K2 to “move calcium into the bones” is a common myth, not a medical requirement. Most healthy people already get enough Vitamin K through diet-leafy greens supply K1, and foods like eggs, dairy, and fermented dishes provide K2. Your body can also convert some K1 into K2 as needed.
Clinical research shows that Vitamin D alone does not cause calcium to build up in arteries, and routine Vitamin K supplementation isn’t necessary unless you have a known deficiency.
Momentous Vitamin D3 is formulated for real-world effectiveness—2000 IU of vegan D3 delivered in organic extra virgin olive oil for superior absorption.†
It supports bone and muscle function, immune health, and calcium metabolism without unnecessary additives or hype, and can be adjusted to meet individual needs based on guidance from your healthcare practitioner.
What matters most is creatine quality, and this is where Momentous stands apart. Our creatine is made with the world’s most trusted and rigorously tested form of creatine monohydrate, produced under pharmaceutical-grade standards. It is NSF Certified for Sport®, meaning every batch is independently verified to contain exactly what’s on the label—no banned substances, no heavy metals, and no contaminants.
We also use zero fillers, flavors, or additives. Just pure, clinically-validated creatine. That purity is what makes Momentous Creatine easier to digest, more consistent in performance, and trusted by elite athletes and high-performers alike.
Some people are concerned about bloating, however creatine does not cause unwanted weight gain or bloating for most people. Any small change on the scale is typically from water being stored inside the muscle cells, not under the skin. This is actually part of how creatine supports strength, power, and recovery, and it tends to normalize with consistent use.
Yes, every product in Arnold’s Stack is certified through NSF Certified for Sport®, a respected independent program that verifies label accuracy and screens for hundreds of banned substances.
We also take transparency a step further by publishing third-party test results via Light Labs on individual product pages and making Certificates of Analysis (COAs) available for every batch.We earn trust the hard way, by proving quality at every step, on every batch, with no shortcuts.
- Taste
- Mixability
- Quality
- Performance
- Digestion
- ACAaron C.Verified ReviewerProduct Standouts Taste + Texture, Trust and Transparency13 minutes agoProduct Standouts Taste + Texture, Trust and TransparencyReviewingCreatine - 90 ServingsRated 5 out of 5 starsFinally a smooth mix!
Weird textures kill me (can't do tapioca, quinoa etc without having to try). I have always had to sort-of rush that last swallow of any mix-in creatine in the past - because of the grit.
This new Signature Spec is just so much more fine and mixable. I didn't have any grit in my teeth and didn't have anything visible in the bottom of the water bottle.
I've often wondered it wasn't possible to have a creatine that was finer and the answer was, seemingly nobody ever made that a priority. To get this benefit as well as tighter scrutiny on inclusions etc is amazing.
Mix-in creatine is back on the table for me.
- DMDana M.Verified Buyer6 hours agoReviewingCreatine - 90 ServingsRated 5 out of 5 starsGood and gritty
I have tried another brand of creatine which dissolves completely. Momentous remains a bit gritty. However, I feel more results with maintaining muscle and ease of lifting since taking Momentous creatine. It's a fair price and arrives as predicted, packaged well, and I find many other lifters at my gym prefer it! I'll continue to use it, too!
- RRashalleYesterdayReviewingWhey Protein IsolateRated 5 out of 5 stars5 Stars
AmaIng stuff!!! I will be a longtime customer. Great flavors. My only request is a 30 day container imstead of 27 days. There is plenty of room in the container.
- JSJennifer S.Verified BuyerProduct Standouts Taste + TextureYesterdayProduct Standouts Taste + TextureReviewingCreatine - 90 ServingsRated 5 out of 5 starsMixes easy
This mixes much easier than my previous brand. It’s not “crunchy” like my prior brand. Love this!
- HDHeidi D.Verified BuyerProduct Standouts Taste + Texture, Ease of UseYesterdayProduct Standouts Taste + Texture, Ease of UseReviewingWhey Protein IsolateRated 5 out of 5 starsGreat !
First powder that doesn’t taste chalky, I ordered plain and love it !
