You train for the compromised state: running on tired legs, moving under load, holding pace while your system is redlined. Your gut decides how much of that fuel you actually get. We read yours, then build the formula around it.
Just add your email to join the HYROX list and unlock your first month on us. We'll email you how to start when you're ready.
HYROX World Champions read their gut with NB1. Every formula is signed off by our science board.
Not a single product, your whole stack. From a library of 125+ ingredients, only the ones your gut reading calls for, each dosed to you, posted to your door every month, presorted and travel-ready.
One subscription, in place of greens powderprobioticomegamagnesiumadaptogens
Live bacteria and daily cofactors, dosed to your reading, to start the day fuelled.
Pre-packed capsules
Targeted recovery and sleep support, included only when your biology calls for it.
Pre-packed capsules
Precision prebiotics: fiber matched to your gut's actual fermentation machinery, to feed the species worth growing.
Powder · 1 scoopThree parts, one protocol, built only for you.
From the at-home sample you collect to your first delivery takes about four weeks. Here's what happens at each step.
Two athletes, same session, same fuel, different results. It comes down to which species live in your gut and how they turn what you eat into what your body can use. We read yours, then build the formula from that.
Retest your gut and see exactly what moved. The same markers, re-measured before and after. One number, objectively re-scored.
The score is what we measure. How it feels is what members tell us, self-reported alongside each retest, not a lab result.
Sleep is self-reported and logged alongside your gut score at each retest. As fibre-fed species recover early in a cycle, sleep and energy tend to be among the first signals people notice shifting.
Energy is one of the self-reported markers tracked against your gut score. In the early weeks, as bifidobacteria respond and fermentation picks back up, daytime energy is often where people report the earliest change.
Bloating is the most direct read on how the gut is running day to day. As an ecosystem moves from a protein- or mucus-driven state back toward a fibre-fed one, digestive comfort is usually where change shows up first and most clearly.
Stress is self-reported alongside each retest. The gut and the systems governing stress are in constant chemical exchange, so it tends to be a slower-moving marker, usually consolidating in the back half of a cycle rather than the first weeks.
Average change seen at first retest, ~4 months in. Individual responses vary; your own retest measures your markers, before and after.
You don't win HYROX by guessing. So why guess with your supplements?
Tim & Alexander hold the Men's Pro Doubles World Record: 47:40, London 2026.
Analysed in certified European labs.
Species-level metagenomic resolution, not a basic 16S test.
Every formula reviewed by our science team before production.
The free month gets you started. The formula is the real thing: built from your own reading, recalibrated every cycle. Two plans, one difference.
We read your gut, and build your formula from it.
4 months is the minimum cycle, biology takes that long to shift.
Gut and blood. Your formula rebuilds every cycle.
4 months is the minimum cycle, biology takes that long to shift.
Join the HYROX list and we'll unlock your first month on us. We'll email you how to start when you're ready.