How to Build Your Hyrox Supplement Stack: Endurance, Energy, and Recovery.

Back when I started training for Hyrox, (which feels like a chunk of time ago now…) I thought I had it all dialled in. Run hard, lift heavy, fuel with protein and carbs - then wash, rinse and repeat. But the deeper I got into the sport, the intensity, the fatigue, the double demand on both endurance and explosive power - I realised something: performance isn’t just about training. It’s about what fuels the training. And if you’re serious about Hyrox, building the right supplement stack for endurance athletes can be the edge between hitting a wall and crossing the line strongly.

Over the past year, I’ve tested, tweaked, and refined what I now consider my personal Hyrox supplement stack, one that powers me through brutal long-run Sundays and race-day chaos. The key is to support three phases: energy, endurance, and recovery. And at Xendurance, we’ve built the stack to match that exact rhythm.

Why Hyrox Demands a Smarter Stack

Hyrox isn’t like your average run or CrossFit WOD. It’s a structured grind that combines eight 1km runs with functional workouts in between: sled push, sled pull, wall balls, rowing, and more. That means you’re constantly switching gears, from aerobic zones to redline and back again, for over an hour.

And the result? Massive energy expenditure, a lactic acid build-up (keep reading for more on that my friend!) and muscular breakdown. That’s why a smart Hyrox supplement stack isn’t just about jacking up your pre-workout energy. It’s about fuelling the full cycle of stress and recovery, sustainably and intelligently.

Phase 1: Energy

You quite simply can’t fake freshness on race day. That’s why I never go into a Hyrox session or event without Fuel 5 in my system. It’s a complex carbohydrate blend made with five transportable fuel sources—glucose, sucrose, maltodextrin, lactate, and fructose—designed to deliver fast and sustained energy. Unlike typical sugary drinks, Fuel 5 gives me consistent blood sugar without the spiking and crashing rollercoaster ride.

If I’m pushing hard in the gym or doing intervals, I stack Fuel 5 with Creatine which, yes, is part of my endurance protocol. The creatine helps regenerate ATP (Adenosine triphosphat which is kind of like the force in Star Wars) - fast, so I’m able to explode into movements like a sled push, or box jump burpees without slamming halfway through.

And when I need a sharper hit, especially before a big race or intense session, I’ll throw in one of our Energy Gels. They’re clean, compact, and hit quick. The formulation includes fast carbs and electrolytes to keep hydration and glucose up when your brain’s screaming for you to stop and your legs are on fire.

Phase 2: Endurance

Here’s where things get pretty serious. Because once you’ve burned through the initial carb stores and adrenaline, your body’s endurance engine needs backup.

This is where Lactic Acid Buffer comes in. (Glad you waited for it :) ) Honestly, it’s probably the least "sexy" product to talk about with no caffeine buzz, or no flavour hype, but it’s my not-so-secret weapon, and it’s the same for countless others too in this space. Lactic Acid Buffer works by helping your body neutralise the hydrogen ions that build up during high-intensity exercise. That burn you feel in your quads during lunges and wall balls? That’s hydrogen accumulation—not just lactate. By buffering those ions, this supplement helps me go harder, for longer, with less drop-off in power.

There’s solid science here too. A 2021 study in Frontiers in Physiology found that beta-alanine and sodium bicarbonate (the core actives in Lactic Acid Buffer) significantly improved repeated high-intensity performance in trained athletes. If you’re doing a sport like Hyrox—where repeated power output is everything—this stuff isn’t optional, it’s critical.

Stacking Lactic Acid Buffer with Fuel 5 gives me the stamina to run strong after I’ve crushed a sled push, not just at the starting line. And that’s what makes the best supplement stack for Hyrox: not how it feels in minute one, but how it supports you in minute 51.

Phase 3: Recovery

Recovery in Hyrox isn’t about lounging with a shake. It’s about speeding up the window between sessions so you can train again with quality.

After any big race or training day, I lean heavily on two things: Creatine and Immune Boost.

Yes, creatine again. Why? Because its benefits extend beyond strength—it’s shown to reduce muscle cell inflammation and improve recovery rates. Studies have also linked it to reduced markers of muscle damage post-exercise. So even on rest days, I keep my 5g/day dose consistent. The handy-sized packets are perfect too to drop into your backpack or sit on your desk so you are always mindful.

But the MVP during peak training season? Immune Boost. It combines Vitamins, Minerals, and Antioxidants & Phytonutrients—each clinically backed to reduce duration and severity of upper respiratory illness. That’s important, because hard training compromises immunity. And nothing derails a Hyrox prep like a poorly timed cold.

It also contains effective research dosages of Lutein and Zeaxanthin to help protect eyes from damaging blue light which for me is a major bonus with my failing eyesight… but most importantly of all it is Informed Sport Certified, which gives absolute peace of mind.

In the last block before my last race, I doubled my Immune Boost intake during heavy weeks. Anecdotally? No illness. No missed sessions. Coincidence? Maybe. But I'm not taking chances anymore.

Let’s have a look at building your Hyrox Supplement Stack

Everyone’s body is different, and so is their training style. But if you’re doing Hyrox or eyeing your first race, your nutrition and supplement game need to evolve with the sport.

For me—and for many of our team here at Xendurance—the winning Hyrox supplement stack looks like this:

• Fuel 5 for clean, sustainable energy
• Energy Gels when I need fast-acting fuel mid-race or mid-training
• Creatine daily, for explosive strength and recovery support
• Lactic Acid Buffer to hold intensity over time without crash
• Immune Boost to stay healthy through the hardest blocks

And the real takeaway? It’s not about gimmicks or hype. It’s about building a system that supports your energy in, stress during, and recovery after—so you can keep showing up, week after week, with intent and purpose.

That’s what training like a Hyrox athlete demands. And it’s what we’re here to help you do at Xendurance.co.uk, one smart stack at a time.

See you at the next start line.