Sports nutrition brand Momentous has announced a multiyear partnership with bodybuilding legend Arnold Schwarzenegger, alongside the launch of The Arnold Stack, a three-product supplement lineup centered on protein, creatine and vitamin D3.

The collaboration comes as the global supplement market is projected to reach $240 billion by 2028, even as consumer trust remains under pressure due to concerns around quality, transparency and scientific credibility. Schwarzenegger said the partnership reflects his long-standing belief in foundational supplements that have proven effective over decades, rather than trend-driven formulations.

The Arnold Stack, priced at $102.85 for a one-time purchase or $77.14 via subscription, was developed to focus on simplicity and evidence-based ingredients. All three products are NSF Certified for Sport and formulated using clinical research standards, with third-party testing built into the development process. Momentous says the approach prioritizes what it calls “earned authority” over influencer-led marketing.

Schwarzenegger’s relationship with Momentous predates the formal partnership. The two sides previously worked together through The Pump Club, Schwarzenegger’s fitness and wellness community with millions of subscribers. According to the company, the informal collaboration allowed both parties to assess alignment on product philosophy, quality benchmarks and long-term vision before making the partnership official.

“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.”

With the launch of The Arnold Stack, Momentous is positioning itself firmly within the science-first segment of the supplement industry, while Schwarzenegger continues to leverage his legacy to advocate for disciplined, fundamentals-driven approaches to fitness and health.