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30-July-2025 | Hannah Spencer Ackermann, RD
A powerful ingredient is emerging in gut health innovation: polyphenols, particularly those naturally bound to dietary fiber. Once valued for their antioxidant capacity, these intrinsic bioactives are being sought out for their potential to modulate the microbiome, offering science-backed, multifunctional solutions for brands.
What are Polyphenols?
We all know the wisdom: ‘Eat the rainbow-plenty of fruits, vegetables, and whole grains.’ But what makes plant-based foods so healthy, and why is it hard to replicate their benefits in a supplement?
The answer lies partly in plants’ intrinsic polyphenol content. Though often lumped together, polyphenols vary greatly: “Other than the phenolic group and the shared biosynthetic pathway, there are few similarities among phenolic compounds,” says University of Alberta Professor Michael Gänzle, a top expert in phenolic compounds. “It is a class of several tens of thousands of phytochemicals, which vary and differ fundamentally in their structure and function.”
Polyphenols’ Deeper Microbiome Impact
The antioxidant capacity of polyphenols is often over-emphasized. “The antioxidant capacity is essentially irrelevant for each and every health benefit,” says Gänzle. “It’s something that’s easy to measure but I don’t think it has any relationship to their biological function.”
Instead, many profound health benefts are mediated directly by our gut microbiome, says Gänzle: “It becomes increasingly clear that many of the health benefts of phenolic compounds are not mediated by the phenolic compounds themselves, but by microbial metabolites.”
Polyphenols interact with gut bacteria via key mechanisms of action:
- Antimicrobial Effects: Inhibiting harmful gut bacteria.
- Metabolite Influence: Transforming into beneficial compounds like short-chain fatty acids (SCFAs).
- Reduced Inflammation: Lowering gut inflammation and combating oxidative stress.
- Digestion Modulation: Phenolic acids can bind to starch, slowing digestion for sustained glucose release and satiety.
The Dietary Fiber and Polyphenol Connection
Experts caution that isolating polyphenols in a supplement can limit their microbiome benefts. This brings us to a crucial discovery: the inherent connection between dietary fiber and polyphenols.
“Emergent research highlights a significant synergistic relationship between fiber and bound-polyphenols, where they collectively increase fermentation and promote a more significant prebiotic effect,” says Brendan Kesler, R&D Innovation Director, Van Drunen Farms and FutureCeuticals, manufacturer of NatureKnit®.
A significant beneft of fiber-bound polyphenols is the proposed protective effect of fiber, which prevents polyphenols from breaking down en route to the colon.
“Polyphenol-bound fibers are especially benefcial for gut health because they deliver polyphenols directly to the colon, where they are released slowly and metabolized by gut microbes,” says Sagarika Banerjee, Senior Investigator, Microbiome, Nutrition & Gut Health at Givaudan. “This synergy enhances the growth of beneficial bacteria, boosts production of short-chain fatty acids, and strengthens the gut barrier. Compared to fiber or polyphenols alone, the bound form offers more targeted, longer-lasting, and powerful effects for microbiome balance and inflammation control.”
The Next Gut Health Frontier: Fiber-Bound Polyphenols
The industry is responding to this discovery by creating fiber-bound polyphenol products.
Arrabina®, a naturally occurring, gluten-free fiber complex from wheat, offers a blend of soluble arabinoxylans, xylo-oligosaccharides, beta-glucan, lignin, and polyphenols. This diversity of prebiotics and fiber-bound polyphenols yields broader health benefts. A recent in vitro SHIME-like (a gut simulation of colonic fermentation) study indicates that Arrabina® promotes greater microbial diversity and production of short-chain fatty acid at lower doses than inulin, a commonly used isolated dietary fiber.
NatureKnit®, a proprietary fiber-bound polyphenol blend (FBPB), is derived from a unique combination of upcycled fruit and vegetable sources. A 2025 study showed Natureknit’s FBPB offered superior, sustained fermentation, significantly more total SCFAs and broadly modulated gut bacteria, highlighting enhanced polyphenol benefts.
The Polyphenol Push
Consumer interest in polyphenols is growing with a 39% increase in Google searches over the last year. The market is responding with product launches featuring polyphenol ingredients up 97% in the past year, according to Mintel’s Global New Product Database.
Fiber-bound polyphenols offer a compelling advantage to appeal to this interest as they are often derived from upcycled fruit and vegetable byproducts, aligning with consumers’ interest in sustainability and reducing food waste. In addition, their low effective dose and superior solubility enable the incorporation into diverse products (from ready-to-mix beverages to functional bars) allowing for broad market access.
Nonetheless, the real potential of polyphenols for gut health is realized when we understand their intricate dance with dietary fiber. These fiber-bound compounds are not just passing through but actively shaping our microbiome.
Read more, including ISAPP and GPA’s perspectives on polyphenols’ prebiotic potential.