Momentous’ new Fiber+ tackles the gut health gap that most supplements ignore

Fiber doesn’t get the same attention as protein or creatine, but researchers and nutrition experts increasingly treat it as foundational.

Momentous is aiming to change that with Fiber+, a performance-focused supplement that goes beyond basic digestion to address gut barrier integrity, metabolic health, and recovery.

How Fiber+ works

Most fiber supplements rely on a single source. Fiber+ uses three, each doing something different in the body:

• Psyllium husk (soluble fiber): Supports blood sugar control, cholesterol levels, and satiety
• Rice bran (insoluble fiber): Supports digestive comfort and regularity
• Solnul® potato starch (resistant starch): Ferments in the colon to produce short-chain fatty acids like butyrate, which support gut barrier integrity, inflammation balance, and metabolic health

That third ingredient is where Fiber+ separates itself from a standard psyllium product. Resistant starch isn’t digested in the small intestine—it travels to the colon, where gut bacteria ferment it into butyrate. Butyrate is increasingly understood to play a role in gut lining health, immune regulation, and metabolic function, not just digestion.

Each serving delivers 6g of fiber and comes in either unflavored or a pure cinnamon option made with real cinnamon bark. Momentous sayis that this product contains no artificial flavors, or sweeteners.

Why fiber, and why now?

95% of Americans don’t get enough fiber—and 67% incorrectly believe they do. That gap has real consequences. As the gut-brain axis and gut-muscle axis become more established in performance research, what happens in the colon is increasingly connected to energy, recovery, and long-term resilience.

New federal nutrition guidelines are also prioritizing protein intake, which can crowd out fiber further. The more protein-forward a diet, the more intentional fiber intake needs to be.

“Gut health influences everything from energy and recovery to long-term resilience, but the category hasn’t kept pace with the science,” says Jeff Byers, Co-Founder and CEO of Momentous. “Fiber+ reflects our commitment to delivering foundational nutrition at the highest standard—because sustainable, life-long performance starts with getting the basics right.”

Fiber+ is also the anchor of Arnold’s Ultimate Stack, Schwarzenegger’s personally selected Momentous routine, which pairs Fiber+ with protein, creatine, and vitamin D3.

Where to buy

Fiber+ is available now at livemomentous.com and in Vitamin Shoppe locations nationwide. $39.95 for 30 servings. Arnold’s Essential Stack (Fiber+ and creatine) is $64.90; Arnold’s Ultimate Stack is $142.80.