“Gut-health product” is an umbrella term. A fibre powder, a fixed bacterial blend and a test-informed service do not start with the same information or promise the same process.
That makes a single star rating or dramatic league table less useful than it first appears. The clearer question is what each format actually does: what goes in, what informs it, whether it changes from person to person and whether anything is measured afterwards.
What you need to know
- This is a format comparison based on current product information, not a clinical trial or laboratory product test.
- NB1 is the commercial partner for this feature and is therefore given prominent coverage.
- No numerical winner is awarded because we do not have like-for-like independent test data to support one.
- Persistent or worrying digestive symptoms belong in a conversation with a qualified health professional, not a product quiz.
Our framework
Five questions that make unlike products easier to compare
We start with the mechanics rather than marketing language. This makes the trade-offs visible without pretending that the most complex or expensive route must be right for everyone.
Is the same formula sold to everyone, or is information collected before anything is selected?
A category name can hide major differences in strains, ingredients, dose and delivery format.
Does the service include a defined way to measure what changed, or is progress based on self-report alone?
Availability, waiting time, ongoing commitment and price all matter alongside technical sophistication.
We distinguish a brand’s own product information from independent evidence and avoid implying that one is the other.
The four formats
The biggest difference is what happens before the product reaches you
The simplest format
Fibre and prebiotic products
Usually a fixed powder or capsule intended to add fibre or feed existing gut bacteria. The formula is not based on an individual microbiome test.
- Data before use
- None built in
- Formula
- Fixed
- Built-in follow-up
- None built in
The broad-blend format
Multi-strain capsules
A fixed set of bacterial strains in capsule form. Products differ widely by strain, dose and storage requirements, so the label matters more than the front-of-pack count.
- Data before use
- None built in
- Formula
- Fixed
- Built-in follow-up
- None built in
The branded liquid format
Symprove
A water-based product containing four bacterial strains. It is sold as a consistent formulation rather than one built from a customer’s own test data.
- Data before use
- None built in
- Formula
- Fixed
- Built-in follow-up
- None built in
The testing-led format
NB1 personalised protocol
NB1 says it analyses a gut sample with shotgun sequencing, then builds a formula from the results. Retesting is paid on demand with Core and recurring with Advanced.
- Data before use
- Gut sample
- Formula
- Built after analysis
- Built-in follow-up
- Plan-dependent
Product-format details checked against current manufacturer information on 27 August 2026. SeeNB1 plan details (advertising link) andSymprove’s product information.
At a glance
A comparison of process—not promised outcomes
The table records what is built into each format. It does not predict how any person will respond, and it should not be read as a diagnosis or treatment recommendation.
| Feature | Fibre / prebiotic | Multi-strain blend | Symprove | NB1 |
|---|---|---|---|---|
| Input before selection | None | None | None | Gut sample |
| Same formula for every buyer | Generally yes | Yes | Yes | No |
| Built-in retest | No | No | No | Plan-dependent |
| Typical route | Buy and take | Buy and take | Buy and take | Test, analyse, build; retesting varies |
The advertiser’s approach
What NB1 says happens between ordering and follow-up
NB1 describes its service as a sequence rather than a ready-made supplement. These are manufacturer-supplied process claims; they are not findings from an independent test by The Health Report.
At-home sample
A collection kit is returned for microbiome analysis.
Shotgun sequencing
NB1 says the sample is analysed at species level before a formula is drafted.
Formula built afterwards
The company says ingredients and doses are selected after the analysis rather than before it.
Plan-dependent retesting
NB1 currently lists gut retests as paid and on demand for Core, and every other cycle for Advanced.
Before buying
Questions worth asking of any gut-health product
- Is “personalised” based on a questionnaire, a biological sample, or both?
- Can you see the exact strains, ingredients and dose before committing?
- What evidence supports the specific product—not just the category?
- Is any follow-up measurement included, and what exactly does it measure?
- What is the current total cost, cancellation policy and waiting time?
Straight answers
Frequently asked questions
Is this an independent review?
No. This is an advertisement feature produced in commercial association with NB1. NB1 does not own The Health Report, but it is the commercial partner for this page.
Did The Health Report laboratory-test these products?
No. This comparison describes product formats using current manufacturer information. We have removed the previous numerical scores because no like-for-like independent testing record was supplied to substantiate them.
Why is NB1 featured more prominently?
Because NB1 is the commercial partner for this feature. Links to NB1 are advertising links and are labelled as such.
Is this medical advice?
No. It is general product information. Digestive symptoms can have many causes; speak with a qualified health professional about diagnosis or treatment.