The multiyear deal centers on a trio of protein, creatine and vitamin D3, which the former bodybuilding champion notes have stood the test of time
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Momentous announced a multiyear partnership with bodybuilding legend Arnold Schwarzenegger alongside the launch of The Arnold Stack, a three-product lineup focused on protein, creatine and vitamin D3, ingredients the former champion says have stood the test of time.
The supplement category is projected to reach $240 billion globally by 2028, yet consumer trust remains fragile amid ongoing questions around quality, transparency and scientific rigor. For Schwarzenegger, the decision reflects years of collaboration with Momentous through The Pump Club, his fitness and wellness platform that reaches millions of subscribers.
Schwarzenegger and Momentous worked together informally before making anything official, testing alignment on product standards and philosophy.
At the center of the launch is The Arnold Stack ($102.85 for one-time purchase, or $77.14 with subscription), which intentionally avoids trend-driven formulations. Each product is NSF Certified for Sport and developed with clinical research standards, combining third-party testing with what the company calls “earned authority” rather than influencer-led hype.
“I’ve seen every fitness trend come and go,” Schwarzenegger said. “Trends don’t build greatness. What actually works has never changed: committing to the basics and doing them well and consistently. I trust Momentous because they do things the right way, not the easy way.”
