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Order your kit

1 month free

Still thinking about your gut health?

Get your personalised formula and 1 month free, applied on your second month. 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: paid at checkout, formula and delivery included.
  • Month 2: free. From month 3, £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.

Your code covers your second month.

You pay your first month at checkout. Your full health report, the complete read of your gut, and your first delivery follow. Your second month is free, so your next payment comes before your third delivery.

Under 4 weeks, every time.*

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

  1. Day 1–3

    Kit arrives

    Dispatched within 24 hours, in your hands in 2–3 working days.

  2. 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.

  3. Day 5–18

    Lab analysis

    Up to 10 working days of sequencing and reading, on your behalf.

  4. Day 18–20 Made for you

    Formula built

    Your formula now exists and goes into production.

  5. Day 20–24

    Delivery

    Your first month arrives, presorted into morning and evening packs.

What members say.

4.8 / 5

  • “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
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

  • 19 Live-culture
    strains
  • 12 Prebiotic
    fibres
  • 21 Vitamins &
    minerals
  • 44 Active
    compounds
Dr. Polina NovikovaProf. Dr. Dirk HallerProf. 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 analysis, 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.

  1. Month 3 Retest: gut + blood
  2. Month 5 Formula evolves
  3. Ongoing Keeps 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.

1 month free with code NB1FIRST on 4 & 12-month plans

Core £94 /mo Gut reading and the formula built from it. 1 month free on 4 & 12-month plans Order Core kit → Recommended Advanced £144 /mo Gut and blood. Rebuilt every cycle from your data. 1 month free on 4 & 12-month plans Order Advanced kit →

Code NB1FIRST applies to 4 and 12-month plans only, and the free month is applied on your second month. 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 included
  • Second month free with your code
  • 1 month free on 4 & 12-month plans
  • Reviewed by our science board