Arnold partnered with Momentous because of its uncompromising commitment to science, ingredient transparency, and third-party testing. Every formula is built using clinically studied ingredients at effective dosages, aligning with Arnold’s long-standing philosophy of disciplined, foundational supplementation.

Arnold focuses on foundational supplements that support strength, recovery, and long-term health. His curated stack includes:

• Whey Protein Isolate
• Creatine Monohydrate
• Vitamin D3
  

These ingredients support muscle protein synthesis, ATP production and bone health, and digestive function.

Arnold’s Stack is composed of well-researched foundational nutrients that are safe for healthy individuals when used as directed. Creatine Monohydrate, Whey Protein Isolate and Vitamin D are among the most studied supplements in sports nutrition.

Yes, all of our products are third-party tested. But that’s not enough for us. That's why we created The Momentous Standard®: a higher bar for science, sourcing, and verification, backed by independent proof you can trust.

Every finished batch is certified through NSF Certified for Sport®, a respected independent program that verifies label accuracy and screens for hundreds of banned substances. If a batch fails to meet these independent standards, it does not ship, because only third-party certification can truly back that promise. 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.

Arnold supports the highest-quality creatine monohydrate made by Momentous. Momentous Creatine is third-party tested and formulated at clinically effective doses, without fillers or proprietary blends.

Creatine supports:

• Increased strength and power output
• ATP regeneration during high-intensity effort
• Lean muscle support
• Cognitive performance and brain energy

It is one of the most researched and effective performance supplements available. Creatine Monohydrate has been studied for decades and is considered safe for long-term use in healthy individuals when taken at recommended doses.

Momentous supplements are manufactured in the United States in facilities that are certified and audited by NSF International, one of the most respected independent testing organizations in the world. 

All products featured on Arnold’s page are NSF Certified for Sport®, which includes facility audits, label verification, and banned substance testing.

Ingredients are sourced from trusted global suppliers and often include clinically studied, trademarked raw materials. Every ingredient is tested for identity, purity, and potency before production. Finished batches undergo third-party testing to verify label accuracy and screen for contaminants such as heavy metals and microbes.

This process ensures consistent quality, transparency, and safety from sourcing through final production.

Momentous supplements are built around foundational, research-supported ingredients and rigorous third-party verification. Every product is NSF Certified for Sport®, and formulas are designed to prioritize effectiveness, transparency, and consistency over trends or unnecessary additives. Momentous focuses on proven ingredients, clean sourcing, and independent testing to deliver supplements trusted by athletes and high-performers.