First month freeCode NB1FIRST · 4 & 12-month plans
Claim first month free →
First month free

Still thinking about your gut health?

Get your personalised formula and your first month free. Complete the gut test and we'll create a formula tailored to your health profile and goals.

Use code at checkout NB1FIRST
Analyse my gut →
  • 4 and 12-month plans only. The code cannot be used on the 1-month rolling plan.
  • Month 1: free, formula and delivery included.
  • Month 2 onward: £94/mo Core or £144/mo Advanced, billed monthly.
  • Cancel anytime in your account, before your next billing date.
A member at home, morning light

Under four weeks, end to end.

One map of the whole thing before the detail. From the kit landing on your doormat to your first delivery arriving, here is every stage and how long it takes.

Day 1–3
Kit arrives
Dispatched within 24 hours, in your hands in 2–3 working days.
Day 3–5
Collect at home
A small stool sample, a few minutes at home. Seal the tube and book a courier to collect from your door.
Day 5–18
Lab analysis
Up to 10 working days of sequencing and reading, on your behalf.
You pay here
Day 18–20
Formula built
Your formula now exists. This is the moment you pay, and nothing is charged before now.
Day 20–24
Delivery
Your first month arrives, presorted into morning and evening packs.
You pay once, only when your formula exists.
That single charge unlocks your full health report, the complete read of your gut, and releases your first delivery. Nothing is charged before this point.
Under 4 weeks, every time.*

*Assumes you schedule collection of your sample within three days of receipt.

What members say.

★★★★★ 4.8 / 5 [verified review count — confirm before publishing]
★★★★★
“I'd been buying six things separately and hoping. Having one pack built from an actual reading of my gut was the first time it felt like a decision rather than a guess.”
James H.Core · 5 months on protocol
★★★★★
“The bloating and the afternoon crash had been going on for years. Around week seven I noticed I'd stopped planning my day around either of them.”
Daniel R.Advanced · 8 months on protocol
★★★★★
“I train six days a week, so recovery is the whole game. What sold me was that the formula changed after the second reading instead of staying the same.”
Tom B.HYROX athlete · Advanced
Shotgun metagenomic sequencing, read at species level
Produced to Good Manufacturing Practice (GMP) standards
Science board sign-off on every formula

It starts with a small sample. A few minutes, at home.

The NB1 stool kit: box, collection tube, instructions leaflet and transport bag

It starts with
a small sample. A few minutes, at home.

A small stool sample. A few tiny amounts into the tube, nothing more. Private, and done in minutes.

Seal it, and a courier collects from your door. Everything you need is in the box, and a replacement kit is free if anything goes wrong.

What actually arrives at your door.

From a library of 125+ ingredients, only the ones your biology calls for, each dosed to your gut reading, health insights and medical questionnaire. Never a default.

One subscription, in place of greens powderprobioticomegamagnesiumadaptogens

Morning
Morning protocol, day blister pack for Leonardo M.
Activate
With breakfast

Live bacteria and daily cofactors, dosed to your reading.

Pre-packed capsules
Evening
Evening protocol, night blister pack for Leonardo M.
Restore
Before bed

Targeted recovery and sleep support, included only when your biology calls for it.

Pre-packed capsules
Anytime
NB1 Prebiotics canister
Nourish
Once a day

Precision prebiotics: fiber matched to your gut's actual fermentation machinery, to feed the species worth growing.

Powder · 1 scoop

Three parts, one protocol, built only for you.

96components on file
19Live-culture
strains
12Prebiotic
fibres
21Vitamins &
minerals
44Active
compounds
Dr. Polina Novikova Prof. Dr. Dirk Haller Prof. Dr. Koen Venema
Science-board vettedOnly evidence-backed ingredients make the library.

A single reading typically draws on about 35 of these. Which ones you get, and at what dose, comes from what your gut can actually do. The rest of the library stays on the shelf.

We did the hard part. Your day is two moments, not seven bottles.

A morning pack, an evening pack, and a scoop of prebiotic when it suits.

Everything else is pre-sorted, portable and handled. No juggling bottles, no pill organiser, no planning. What’s left is yours: the commitment to show up.

This was the drawer.
A drawer crammed with mismatched, unlabelled supplement bottles, blister packs and loose capsules
This is the whole thing now.
A tidy windowsill with a glass of water, the NB1 tin, and morning and evening blister cards
Pre-sorted for you

Your whole day arrives sorted into a morning and an evening pack. No pill organiser, nothing to count, nothing to measure.

Travels anywhere

Tear off the days you need and go. Packs slip into a bag or pocket, so a weekend or a full month packs flat in seconds.

Never runs out

Your next month arrives before you finish this one. No reordering, no gaps to plan around, no running out mid-week.

One formula, or a living protocol.

Everyone starts with the same gut reading. From there, Core holds steady and Advanced keeps adapting.

Gut diagnostic
everyone starts here
Core
One formula, built once from your reading, then delivered every month.
Advanced the living protocol
Retested at month three with gut and blood. Your formula evolves and keeps adapting.
Retest: gut + bloodMonth 3
Formula evolvesMonth 5
keeps adapting
Gut diagnostic, everyone starts here
Core

One formula, built once from your reading, then delivered every month.

Advanced the living protocol

Retested at month three with gut and blood. Your formula evolves and keeps adapting.

Month 3Retest: gut + blood
Month 5Formula evolves
OngoingKeeps adapting
Compare Core and Advanced in full

Stop guessing. Start with your biology.

Your kit ships first. Your formula is produced after your analysis never before.

First month free with codeNB1FIRSTon 4 & 12-month plans

Code NB1FIRST applies to 4 and 12-month plans only. Four months is the term we suggest, the window your biology needs to shift, and 12 months carries the lowest monthly price. A one-month term is available, but the free month does not apply to it. Prices are shown in GBP; any currency conversion or FX fee is set by your bank.

Analysis includedCharged only on productionFirst month free on 4 & 12-month plansReviewed by our science board