Polyphenols are a family of plant compounds, thousands of them, that give plants their color, bitterness, and defense. Flavonoids, tannins, and phenolic acids all belong to this family.

Most of them are poorly absorbed in the small intestine. For decades that was treated as a flaw.

We see it the other way around. Because they are not absorbed, most polyphenols travel intact to where the real conversation happens: the gut (1).

A polyphenol is not an ingredient on a label. It is a mechanism.

Through a two-way relationship with your microbiome.

Your gut bacteria break polyphenols down into smaller, often more active compounds. Metabolites like urolithins and equol can do things the original molecule never could (2, 3).

In return, the polyphenols reshape the bacterial community itself, feeding beneficial organisms while suppressing the ones driving dysfunction (4).

Certain metabolites also support the intestinal lining, reinforcing the tight-junction proteins (occludin, claudin, ZO-1) that decide what passes through your gut wall and what does not (5).

Researchers have a name for a compound that does both at once. They call it a duplibiotic. Polyphenols are the clearest example we have (4).

They are answering different questions.

Food comes first. A varied diet of berries, olive oil, herbs, tea, coffee, and dark chocolate delivers a wide spectrum of polyphenols alongside fiber and nutrients no capsule replaces.

What food cannot do is deliver one specific polyphenol, at a specific dose, to a specific place in the gut, consistently, every day.

That is what a formulation is for. Our lead formulation is built around quebracho, an exceptionally large polyphenol chosen precisely because it resists absorption and acts in the lumen where bacterial gas is produced (6).

Diet is the foundation. Formulation is the aim.

Probiotics add bacteria. Polyphenols change the environment those bacteria live in.

A probiotic introduces live organisms and hopes they establish. Whether they do depends on the ecosystem already in place.

Polyphenols work on the ecosystem itself. They feed some populations and suppress others, which is what makes them more precise than fiber-based prebiotics that push the whole community in one direction (4).

There is also a timing difference. Polyphenols do not need to colonize anything to work. They act on arrival.

Neither approach is wrong. They are aimed at different parts of the problem.

There is no established recommended daily intake for polyphenols. No RDA, no DRI. The research is not there yet, and anyone quoting you a precise number is ahead of the evidence.

What we do know is what people actually eat. Population studies put average adult intake somewhere between roughly 800 and 1,800 mg a day, varying widely by country and diet.

That range is a description, not a target.

The more useful question is not how many milligrams, but which polyphenol, and where in the gut it ends up. A gram of the wrong compound, absorbed in the small intestine, does nothing for the colon.

This is where the SIBO and IBS conversation gets interesting, and where we are careful about what we claim.

Gas and bloating are frequently downstream of bacterial fermentation in the small intestine. That is a mechanism, not a mystery.

Our formulation targets that mechanism directly. Quebracho acts in the lumen where fermentation happens, paired with horse chestnut, which targets the enzymatic step behind methane production (6). That approach has been the subject of clinical research, including a pilot study in patients with methane-predominant overgrowth, now more commonly described as intestinal methanogen overgrowth, or IMO (7).

Atrantil is a dietary supplement, not a treatment for IBS or SIBO. If your symptoms are persistent, severe, or new, talk to a gastroenterologist.