Four ways to act on the gut microbiome
There are four kinds of ingredient that set out to change the gut microbiome, and they work by different means. Probiotics deliver live bacteria. Prebiotics are substrates — fibres — that the resident bacteria eat. Postbiotics are non-living bacterial cells or their components. A precision bioactive is none of these: a small molecule from a plant that modulates named species already present in the gut, without being consumed by them.
The first three are established categories with decades of products behind them. The fourth is the one Trilliome works in, and it exists because each of the others has a structural ceiling.
Probiotics: adding bacteria
A probiotic adds a strain from outside. The strain has to survive manufacturing, the shelf, the stomach, and then establish itself in a gut that already has a full population — which is why engraftment is the perennial problem of the category. Live cells also need protecting: cold chain, coatings, viability testing.
The harder limit is biological. The gut species most closely linked to brain and metabolic health are strict anaerobes. They die on contact with oxygen, so they cannot be grown, dried and bottled at all. A probiotic can only carry what survives a bottle, and the most interesting species don't.
Prebiotics: feeding bacteria in bulk
A prebiotic fibre — inulin, FOS, GOS — is food for bacteria. It works, but bacteria consume it, so the delivered mass sets the effect: intakes run to 5–10 grams a day. That bulk keeps fibre out of capsules, gummies and most compact formats, and it feeds broadly rather than selectively.
Fibre isn't the problem; bulk is. Trilliome's own TRI-04 is a prebiotic fibre, engineered to a low molecular weight and water-soluble so that it supports the gut's butyrate producers without the gram-scale load. (See TRI-04.)
Postbiotics: the components, not the cells
A postbiotic is what's left when the bacteria are inactivated — heat-killed cells, cell-wall fragments, metabolites. That solves the viability problem: postbiotics are shelf-stable and fit any format. What they can deliver is fixed at manufacture, the effective dose varies widely from product to product, and the claim ceiling has so far stayed close to general gut health.
Precision bioactives: reprogramming what's already there
A precision bioactive takes a different route. Instead of adding bacteria or feeding them, it changes the conditions the resident bacteria live in, in favour of specific beneficial species.
The gut is an anaerobic environment, and many of its most useful bacteria are highly sensitive to oxygen. Those bacteria can use dietary antioxidants, such as polyphenols, to neutralise harmful oxygen radicals — a process that protects them, boosts their energy metabolism, and produces beneficial metabolites. A precision bioactive is a plant-derived molecule selected, and mapped against the anaerobic gut, to do exactly that for named species.
Because the molecule is a modulator rather than a substrate, the bacteria don't eat it. That is why the dose is milligrams where fibre needs grams — and why the ingredient formulates like any other small active: shelf-stable, no cold chain, any format.
Trilliome's lead active, TRI-01, induces a named four-species consortium of keystone gut bacteria — the lead species by up to +45-fold in ex-vivo human gut models — at a target intake of ≤200 mg a day. (See TRI-01 and the evidence.)
Side by side
| Precision bioactive | Prebiotic fibre | Probiotic | Postbiotic | |
|---|---|---|---|---|
| What it is | Plant-derived small molecule | Fermentable fibre | Live strain | Inactivated cells or components |
| How it acts | Induces named resident species | Feeds bacteria as substrate | Adds a strain from outside | Delivers fixed components |
| Effective dose | Milligrams | 5,000–15,000 mg | 1–50 billion CFU | Highly variable |
| Alive? | No | No | Yes | No |
| Stability | Shelf-stable | Shelf-stable | Often cold-chain | Shelf-stable |
| Format fit | All formats | Limited by bulk | Cold-chain or coated | All formats |
| Reaches strict anaerobes | Yes — they're already there | Indirectly | No — they can't be bottled | No |
| Claim ceiling | Gut → gut-brain | Gut | Gut; some mood | Limited |
Which one, when
- A compact format — capsule, gummy, stick, shot — rules out gram-scale fibre. A precision bioactive or a low-molecular-weight fibre fits.
- A specific outcome that depends on particular species — the butyrate producers, the neuroactive keystone species — calls for an ingredient that can act on those species. A precision bioactive is built for that; a broad substrate feeds whatever is there.
- A well-understood, direct mechanism at scale is where a clean prebiotic fibre still wins, which is why TRI-04 exists alongside TRI-01.
- A strain with its own clinical file is what a probiotic offers, when the strain survives the format.
None of this is either/or. A formulator can pair a precision bioactive with a fibre; Trilliome makes one of each.
What can be claimed
Precision bioactives are food ingredients, not drugs. At launch the claims are gut-health structure-function claims, on mechanism, ex-vivo induction data and a Self-Affirmed GRAS pathway. The gut-brain axis is the evidence-gated destination — claims there follow the clinical work, not precede it. (How the evidence is being built: /science/evidence.)