EI8HT by Avrox

Endurance Hydration. Performance. Recovery.
EI8HT by Avrox is a patented oxygen performance supplement designed to help sustain performance and reduce fatigue during high-intensity training and racing.

Hold Your Performance When Fatigue Builds

As effort increases and fatigue builds, performance often drops — not because you’ve run out of fuel, but because your body struggles to access the energy that’s already there. EI8HT is designed to support this oxygen-to-energy process so you can hold pace, power and performance deeper into training and racing.

EnduroLiving uses EI8HT within endurance training, racing and recovery protocols, which is why EI8HT by Avrox is an EnduroLiving Preferred Partner product.

EI8HT Sachets - 7 Pack
EI8HT Sachets - 7 Pack
£14.99

EI8HT – Oxygen Support for Endurance Performance

Every athlete recognises the moment performance starts to drop.

It’s the difference between:

  • Holding pace or watching it fade

  • Finishing strong or simply finishing

  • Staying aggressive or backing off

EI8HT is built to support oxygen delivery and sustained output when fatigue sets in — helping you maintain intensity during hard efforts, long sessions, and competitive environments.

Available Options:

  • Original – Designed for daily training and repeat efforts.

  • Original + Caffeine – Adds caffeine to enhance focus, alertness, and power output.

  • Mix – 25 Original + 25 Caffeine for flexible use across training and race days.

Built for serious training. Ready for race day.

Informed Sport Certified & FDA Approved.

What Is EI8HT?

EI8HT is a patented oxygen supplement designed for athletes training and competing at high intensity.

It is designed to help:

  • Sustain performance when fatigue builds

  • Support oxygen delivery to working muscles

  • Help maintain pace and power during hard efforts

  • Reduce performance drop-off late in sessions or races

  • Support recovery by improving oxygen delivery and waste clearance

  • Improve repeat-effort performance

EI8HT is not a replacement for carbohydrates or electrolytes — it works alongside your hydration and fuelling strategy to help you perform at a higher level for longer.

EI8HT User & Professional Athlete

“It is definitely helping maximise training effects. I usually start to wake up tired several weeks into a hard block, but this time I am bouncing out of bed ready to train”

The Science Behind EI8HT

Performance depends on how well your body can use oxygen to produce energy. As intensity increases, the body can struggle to convert oxygen into usable energy fast enough, which leads to fatigue and performance drop.

EI8HT is designed to support this oxygen-to-energy process, helping athletes sustain performance during:

  • Threshold sessions

  • Intervals

  • Long climbs

  • Race pace efforts

  • HYROX / High intensity training

  • Endurance racing

It can also support recovery by:

  • Supporting oxygen delivery to muscles

  • Helping clear metabolic waste such as lactate

  • Reducing mental and physical fatigue

  • Supporting faster recovery between sessions

Buy EI8HT from EnduroLiving

EnduroLiving is an official EI8HT Preferred Partner, and we supply EI8HT to endurance athletes, members and clients through our EnduroStore.

Shop EI8HT →

Frequently Asked Questions

  • EI8HT is a patented oxygen performance supplement developed by Avrox. It is designed to help your body convert oxygen into usable energy more efficiently during high-intensity exercise.

    As effort increases, fatigue often comes from the body’s inability to utilise oxygen effectively. EI8HT supports this process, helping you maintain performance, sustain effort and reduce the drop-off during hard training or racing.

  • No — EI8HT is not a traditional electrolyte or energy drink.

    It works alongside:

    • Electrolytes (hydration)

    • Carbohydrates (fuel)

    • Caffeine (stimulation)

    EI8HT’s role is different — it supports oxygen utilisation and fatigue resistance, helping you perform at a higher level for longer. This makes it a powerful addition to your existing hydration and fuelling strategy.

  • EI8HT is best used around high-intensity or demanding efforts, including:

    • Interval training

    • Threshold sessions

    • Long endurance sessions

    • Races and competitions

    • HYROX and high-output training

    It can be taken:

    • Before training

    • During longer sessions

    • After training to support recovery

    Many athletes use EI8HT on their hardest days to maintain performance when fatigue would normally kick in.

  • EI8HT is designed for people who want to perform better under fatigue, including:

    • Runners and trail runners

    • Cyclists

    • Triathletes

    • HYROX athletes

    • Endurance athletes

    • High-performing individuals

    If your training involves pushing intensity, sustaining pace, or competing — EI8HT is designed for you.

  • At EnduroLiving, we test products in real training environments — not just in theory.

    EI8HT is used within:

    • Endurance training protocols

    • VO₂ max testing preparation

    • Long runs and rides

    • High-intensity sessions

    • Recovery protocols

    That’s why EI8HT is an EnduroLiving Preferred Partner product.

    It fills a critical gap in performance: helping you sustain output when fatigue builds.