Hyrox has an effort profile that few disciplines share: eight kilometers of running divided into eight one-kilometer segments, each followed by a functional training station, always in the same order, everywhere in the world. Neither a marathon nor a strength session: a constant alternation between the two, over a duration that generally ranges from sixty to one hundred minutes.
Hence the legitimate question: which supplements actually work for this format? The honest answer hinges on a distinction that most articles avoid. A handful of ingredients have an authorized health claim in the European Union, meaning an effect that has been evaluated and validated by authorities. Others rely on actual scientific data but without authorized claims, which prohibits any brand from attributing an effect to them. The rest is marketing. This guide places each ingredient in the right category, then provides a protocol applicable from preparation through the day after the race.
What has an authorized European health claim and fits the format: creatine, which increases physical performance during successive series of very intense short-duration exercises, exactly the profile of strength stations; carbohydrate-electrolyte solutions, which improve water absorption during exercise and help maintain endurance performance during prolonged exercise; protein, which contributes to the maintenance and growth of muscle mass; magnesium, which contributes to reducing fatigue, normal muscle function, and electrolyte balance.
What has data but no authorized claims : beta-alanine, bicarbonate, nitrates, caffeine. No brand has the right to attribute performance effects to them, which doesn't mean research is empty, but requires presenting them as possibilities rather than promises. And the principle that overrides everything else : no supplement compensates for inadequate training, and nothing should be tested on race day.
Understanding the Physiological Demands of Hyrox
The format never changes: one kilometer of running, one station, and so on eight times. The eight stations always follow the same order, making hyrox a comparable benchmark from one city to another and from one year to the next. Here is the sequence:
| Order | Station | Primary Focus |
|---|---|---|
| 1 | 1,000 m SkiErg | Upper body, aerobic capacity |
| 2 | 50 m Sled Push | Strength, very intense effort |
| 3 | 50 m Sled Pull | Strength, posterior chain |
| 4 | 80 m Burpee Broad Jump | Full body, high cardiovascular demand |
| 5 | 1,000 m Rowing | Full body, aerobic capacity |
| 6 | 200 m Farmers Carry | Grip, core stability, load carrying |
| 7 | 100 m Sandbag Lunges | Lower body, strength endurance |
| 8 | 100 Wall Balls | Repeated efforts, finish line |
Three characteristics determine nutritional strategy.
Running accounts for approximately half the total time. This is the point that beginners most underestimate: running eight kilometers fresh is accessible to many people, but running one kilometer after a heavy sled push and another after one hundred wall balls is a completely different exercise. The nutritional consequence is straightforward: you cannot reason like a pure strength athlete—energy availability and hydration matter as much as power.
Strength stations impose repeated intense efforts. Sled push, sled pull, burpees, wall balls: these are short and very intense sequences, interspersed with incomplete recovery periods. This is precisely the profile targeted by creatine's approved claim, which is no coincidence if it comes up in every preparation discussion.
The environment is hot and enclosed. Races are held indoors, in exhibition halls or arenas where heat and humidity rise quickly with the number of participants. Over one to one hour and forty minutes of effort, the sweat losses become a real factor, and with them sodium losses.
One last thing to know: only the loads change between divisions. The SkiErg, the rower, and burpee broad jumps are identical everywhere, while five strength stations see their loads increase in the Pro division. Since these loads can be revised from one season to the next, always verify those for your division in the official rulebook before your race.
What has an approved claim
In Europe, a brand cannot assign just any effect to an ingredient. Each claim must be scientifically evaluated and then approved, and the vast majority of applications are rejected. When a claim exists, it therefore constitutes the strongest level of evidence available on the market. Here are the four that concern hyrox.
| Ingredient | Approved claim | Interest for this format |
|---|---|---|
| Creatine | Increases physical performance in successive series of very intense short-duration exercises | Sled push and pull, burpees, wall balls |
| Carbohydrate-electrolyte solutions | Improve water absorption during exercise and help maintain endurance performance during prolonged endurance exercises | Hydration and energy over 60 to 100 minutes |
| Protein | Contribute to the maintenance and growth of muscle mass | Recovery between training sessions |
| Magnesium | Contributes to reducing fatigue, normal muscle function, and electrolyte balance | Training load, sweat losses |
Creatine, the claim that describes hyrox
Re-read the official claim: successive series of very intense exercises of short duration. This is the definition of a sled push followed by a sled pull, or one hundred wall balls at the end of the course. No other ingredient on the market has a claim that fits this format so precisely.
Two practical points. First the dose : the claim is conditioned on a daily intake of three grams, to be taken every day, including outside of training, because the effect relies on the progressive saturation of muscle reserves and not on a one-time dose. No point in loading up the day before a race.
Then the question of weight, legitimate in a format where running accounts for half the time: weight gain related to intramuscular water retention is frequently reported at the start of supplementation. The practical answer is not to give up, but to start taking creatine early in your preparation to observe your own reaction and have time to adjust.
Creatine increases physical performance during successive series of very intense exercises of short duration, with a daily intake of 3 g. Our version uses the raw material Creapure®, manufactured in Germany and recognized for its purity, with detailed composition and no opaque blends. Useful point for competitors: creatine is not on the list of banned substances in sport.
See Creatine Creapure®Carbohydrates and electrolytes, the real issue on race day
Two authorized claims exist for carbohydrate-electrolyte solutions, and they complement each other: one concernswater absorption during exercise, the other concerns the maintenance of endurance performance during prolonged exercise. In a format lasting one hour or more, in warm conditions, both are relevant.
The difficulty of hyrox is logistical rather than physiological: between the runs and the stations, opportunities to drink comfortably are rare, and the intensity makes digestion difficult. The strategy is therefore built largely before the start, with careful hydration in the hours before, rather than regular consumption during the effort as in trail running. And it is tested in training, never on race day.
Protein and magnesium, the foundation of preparation
These two are not decided on race day but during the weeks leading up to it, where performance is actually built. Proteins contribute to the maintenance and growth of muscle mass: in a preparation that combines running, strength and intervals, the ability to handle the load depends directly on recovery, therefore on protein intake and its distribution throughout the day.
<<<36>>> Magnesium magnésium combines three relevant claims: reduction of fatigue, normal muscle function, electrolyte balance. Be careful, however, of a very common confusion: no anti-cramp claim is authorized, and the mechanisms of exercise-induced cramps remain debated. A brand that promises you an end to cramps is operating outside the legal framework.
What has data, but no claim
This category exists and it would be dishonest to ignore it. Certain ingredients are the subject of serious research in exercise physiology without having an authorized claim in Europe. Direct consequence: no brand has the right to attribute an effect to them, and you should consider them as documented leads rather than as promises.
| Ingredient | What is being studied | Regulatory status |
|---|---|---|
| Beta-alanine | Buffering role during intense efforts lasting a few minutes | No authorized claim |
| Sodium bicarbonate | Buffering capacity, with often problematic digestive tolerance | No authorized claim |
| Dietary nitrates | Research on effort economy in endurance | No authorized claim |
| Caffeine | Very widespread use before exercise | No performance claim authorized, and substance on the anti-doping monitoring program |
| BCAA | Branched-chain amino acids, widely marketed in sports | No authorized claim |
Two honest remarks about this list. Beta-alanine has the most consistent profile with certain stations, and its known adverse effect, transient skin tingling, is benign: it's a reasonable lead to test in preparation, without expecting miracles. BCAA, on the other hand, have marginal interest for someone whose daily protein intake is already sufficient and well distributed: a source of complete proteins meets the need, plus the corresponding authorized claim.
What falls under marketing
- "Special hyrox" products. No supplement targets a specific station: the body doesn't function by compartment. A product that presents itself as designed for the sled push is selling an image, not physiology.
- Anti-cramping promises. No claim of this type is authorized, regardless of the ingredient highlighted.
- Blends without detailed information. A pre-workout that announces a formula without dosing each ingredient prevents you from knowing what you're taking, which is a safety issue before it's a performance issue.
- Promises to burn fat or boost testosterone. Non-authorized formulations: their presence on a label signals a brand that doesn't respect the regulatory framework.
- Stacking ten products together. The higher the stack, the greater the risk of contamination and interaction, and the less you know what produces what.
The four-phase protocol
Anti-doping and contamination: the competitor's reflex
Once you start competing, the question arises. And it doesn't concern those trying to cheat: it concerns those taking a product in good faith without knowing its actual composition.
Two mechanisms are at play. Cross-contamination, when traces pass from one product to another on the same production line. Andundeclared addition, when a manufacturer includes an active substance without mentioning it on the label, to guarantee a noticeable effect. The segments most at risk are those with the strongest claims: pre-workouts, fat burners, mass-gain products.
The athlete is responsible for what is found in their body, regardless of its origin. A contaminated supplement is not an excuse: circumstances can reduce a sanction, they do not erase the infraction. The only real protection is upstream: verify each ingredient, choose products tested by an independent laboratory, and avoid opaque purchasing channels. For details on prohibited categories and verification methods, see our guide on products banned in sport.
Good news about the ingredients mentioned above: creatine is not listed on the list of prohibited substances, any more than proteins, magnesium, or carbohydrate-electrolyte solutions. The risk therefore does not come from the molecule itself, but from the manufacturing quality of the product containing it. This is exactly why third-party laboratory analysis, lot by lot, is not a marketing argument but a necessity for a competitor.
The most common mistakes
- Testing something on race day. Mistake number one, and the most avoidable. An unfamiliar gel, a pre-workout handed out at the expo, a stronger coffee than usual: everything should be tested during preparation.
- Confusing supplement with preparation. In this format, running volume, technique at the stations, and transition management determine the result long before any product does.
- Discovering creatine three weeks before the race. Its effect builds through saturation, and any initial weight gain deserves to be observed over time.
- Neglecting sodium in a heated indoor space. Sweat losses indoors are widely underestimated, and water alone does not compensate for everything.
- Stacking multiple products. The higher the stack, the less you know what's actually working, and the greater the contamination risk becomes.
- Eating an unusual breakfast. Too large, too high in fiber or fat: the digestive system struggles with the alternation between running and stations.
A supplement does not create performance; it supports preparation that already exists. If you must remember one rule only: build your training, sleep, and baseline nutrition first, then optionally add what has an authorized health claim and matches your actual need. And test everything well in advance.
Frequently asked questions
Format and needs
Which supplements are really useful for hyrox?
Only a few ingredients have authorized health claims in the European Union and match the effort profile. Creatine increases physical performance during successive series of very intense short-duration exercises, which corresponds to the strength stations. Carbohydrate-electrolyte solutions help maintain endurance performance and improve water absorption during exercise. Proteins help maintain and increase muscle mass. Magnesium helps reduce fatigue, support normal muscle function, and maintain electrolyte balance.
What type of effort is hyrox exactly?
A hybrid format identical everywhere: eight kilometers of running interspersed with eight stations, always in the same order. Running represents approximately half the total time. The effort typically lasts between sixty and one hundred twenty minutes depending on level and division. This alternation between aerobic capacity and repeated intense efforts makes the nutritional strategy unique: neither that of a marathoner nor that of a pure strength athlete.
What is the difference between Open and Pro divisions?
The format is identical: same distances, same stations in the same order, same number of repetitions. Only the loads change across five strength stations. The SkiErg, rowing machine, and burpee broad jumps are identical across all divisions. Since loads may be revised from season to season, check those for your division in the official rules before your race.
Does a beginner need supplements for their first hyrox?
No. For a first race, what determines the result is elsewhere: running volume, technique at the stations, transition management, and sleep. A supplement never compensates for insufficient preparation. Build your training and baseline nutrition first, then consider targeted supplementation if a specific need becomes apparent.
Do you need different supplements depending on the stations?
No, and this is a marketing argument to dismiss. No supplement targets a particular station: the body does not function in compartments. The useful approach starts from the overall effort profile—an alternation of endurance and repeated intense efforts over approximately ninety minutes—and addresses the corresponding needs: available energy, hydration and sodium, muscle recovery.
Creatine
Is creatine useful in hyrox when there are 8 km of running?
Yes, and it is the ingredient whose claim best fits the format. The authorized claim targets successive series of very intense short-duration exercises, which describes sled push, sled pull, wall balls, or burpees. The typical concern involves weight gain linked to intramuscular water retention, which may impact the running portion. In practice, the gains at the stations are generally considered superior. Test it during preparation, never on race day.
What dose of creatine for a hyrox athlete?
The European claim is conditioned on a daily intake of three grams. This is the standard maintenance dose, to be taken daily, including non-training days, as the effect relies on progressive saturation of muscle reserves. There is no benefit in doubling doses before a race: creatine is not a stimulant with immediate effects.
Does creatine cause weight gain, a problem for running?
Weight gain linked to intramuscular water retention is frequently reported at the start of supplementation. In a format where running represents approximately half the total time, the question is legitimate. The practical answer is to integrate creatine early enough in your preparation to observe your own response, rather than discovering it in the weeks before a race.
Hydration on race day
Should you drink a carbohydrate beverage during the race?
For an effort exceeding an hour, it makes sense. Two authorized claims exist for carbohydrate-electrolyte solutions: they improve water absorption during exercise and contribute to maintaining endurance performance during prolonged exercise. The constraint of hyrox is logistical: drinking opportunities are limited and intensity makes digestion difficult. Strategy is therefore built mainly before the start, and tested during training.
Are electrolytes important in hyrox?
Races take place indoors, often in warm halls, with significant sweat losses over sixty to one hundred minutes. Sodium is the main electrolyte lost in sweat. Magnesium has authorized claims on electrolyte balance, normal muscle function, and fatigue reduction. Be careful, however, about anti-cramp promises: no claims of this type are authorized.
What to eat on the morning of a hyrox race?
A meal rich in carbohydrates, low in fiber and fat, consumed two to three hours before departure, already tested several times during training. The intensity and alternation between running and stations place strong demands on the digestive system: an unusual or overly large meal takes its toll on burpees and wall balls. Absolute rule on race day: nothing new.
Which supplements to recover after a hyrox?
In the hours that follow, the combination of carbohydrates and protein makes it possible to replenish reserves and support muscle, with proteins having the authorized claim on the maintenance and growth of muscle mass. Rehydration matters just as much. Magnesium can play a role, with its claims on fatigue reduction and normal muscle function. The rest is sleep and time.
The ingredients discussed
Does beta-alanine improve performance in hyrox?
Scientific data exists on its buffering role during intense efforts lasting a few minutes, which corresponds to the profile of certain stations. But it has no authorized health claim in the European Union: no brand can legally attribute an effect on performance to it. Its best-known side effect, transient skin tingling, is benign. A documented lead, not a promise.
Is caffeine authorized and useful?
Caffeine is not prohibited in sport, but it is on the World Anti-Doping Agency's monitoring program. On the food regulation side, performance claim requests have not been successful in the European Union. Two precautions: never test an unusual dose on race day, and be wary of pre-workouts that combine caffeine with other stimulants sometimes not declared.
Should you take BCAAs for hyrox?
Branched-chain amino acids have no authorized health claims in the European Union. In a person whose daily protein intake is already sufficient and well distributed, their additional benefit is low: a complete protein source covers the need, with the corresponding authorized claim on the maintenance and growth of muscle mass.
How much protein per day to prepare for a hyrox?
The need of someone in preparation is higher than that of a sedentary person, and it depends as much on total quantity as on distribution throughout the day. Rather than a single figure valid for everyone, evaluate your actual intake over a few days, then adjust with a professional if necessary. Proteins contribute to the maintenance and growth of muscle mass, making them the foundation of recovery.
Safety
Can supplements cause a failed anti-doping test?
Yes, and it's one of the most frequent causes of involuntary positive tests, through cross-contamination in production or through undeclared addition of an active substance. The principle of strict liability applies: the athlete is responsible for what is found in their body. The solution is to choose products verified batch by batch by an independent laboratory, read all labels, and avoid opaque purchase channels.
How to know if a supplement is reliable?
Four criteria. The composition is detailed ingredient by ingredient, without blends whose details are not provided. Analyses are performed by a third-party laboratory and accessible, ideally batch by batch. The batch number is identifiable. And the claims displayed correspond to the authorized framework: a brand that promises spectacular effects using unauthorized terms mainly signals that it does not comply with regulations.
Glossary
- Authorized health claim
- Formulation evaluated and then authorized at European level, the only one legally usable to attribute an effect to a nutrient.
- Roxzone
- Transition zone between the race track and the stations area, where a significant part of the timer is played out.
- Carbohydrate-electrolyte solution
- Beverage combining carbohydrates and minerals, which has authorized claims on water absorption and maintenance of endurance performance.
- Creatine
- Molecule naturally present in the body and food, whose authorized claim targets successive series of very intense short-duration exercises.
- Strict liability
- Anti-doping principle under which the athlete is responsible for the presence of a prohibited substance in their body, regardless of its origin.
- Cross-contamination
- Involuntary passage of traces of a substance from one product to another during manufacturing.
Sources
- European Commission. Register of authorized nutrition and health claims, including for creatine, carbohydrate-electrolyte solutions, proteins, and magnesium. ec.europa.eu
- World Anti-Doping Agency. 2026 Prohibited List and Monitoring Program. wada-ama.org
- Nutrition•pro. Doping: prohibited products in sport, international guide. Read the guide
