Creatine for Hyrox: dose, timing and what it actually does
Creatine is the most studied supplement in sport, and it's still the one most Hyrox athletes skip because they assume it's for powerlifters. In fact creatine earns its place across the eight stations, where the sled push, the burpee broad jumps and the wall balls all draw on the phosphocreatine system. That system runs dry in about 10 seconds unless it's topped up.
Here's what the research supports, where it falls short, and how to take it without carrying water weight into a race.
What creatine actually does
Your muscles store creatine as phosphocreatine. During short, maximal efforts, phosphocreatine hands a phosphate to ADP and rebuilds ATP fast. More stored phosphocreatine means you rebuild ATP quicker between efforts and hold power for longer before you fall back on glycolysis.
Supplementing raises muscle creatine stores by roughly 20-40% depending on where you start (Hultman et al., 1996). Vegetarians and anyone who eats little red meat usually see the biggest jump, because they start from a lower baseline.
The ISSN position stand on creatine calls it the most effective nutritional supplement available for increasing high-intensity exercise capacity and lean mass during training. That's a firm claim from a body that hedges most things.
It won't make you faster over the 8km of running. The running in Hyrox is aerobic, and creatine works on the anaerobic side. If your run splits are the problem, that's a Zone 2 conversation.
Where it shows up in a Hyrox race
Think about which stations leave you doubled over.
The sled push and sled pull are repeated near-maximal efforts with short recoveries. Burpee broad jumps are 80m of stop-start power. Wall balls are 100 reps of the same movement as fatigue piles up. All three lean hard on phosphocreatine, and all three are where minutes get lost.
Creatine also works quietly between sessions. Bigger muscle stores support training volume and the quality of repeated efforts, which is where most of your adaptation comes from. Over a 12-week block, small gains in session quality add up to something you can see on the race clock.
There's a secondary effect worth knowing about. Creatine helps you store glycogen alongside carbohydrate, which matters if you're carb loading before a race.
Dose and loading
There are two protocols, and both are well supported.
Loading. Roughly 0.3g per kg of bodyweight per day, split into 4 doses, for 5-7 days. For most athletes that's around 20g a day. Then drop to maintenance. Your stores saturate in about a week.
Slow load. 3-5g a day from the start, or roughly 0.03g per kg. You reach the same saturation in about 28 days, with less stomach upset and a gentler water shift.
If you're 8 weeks out from a race, take the slow route. If you're starting a training block and want the benefit sooner, load.
Both get you to the same place. The only difference is how fast you get there and how much your stomach notices.
Timing, and the water weight question
Timing is the part athletes overthink. Taking it every day is what saturates your muscles, and that's the whole mechanism. Post-training has slightly better evidence than pre-training, but the gap is tiny compared with simply taking it daily for a month.
Water retention is the real race-week worry. Creatine pulls water into muscle cells, and that extra hydration inside the cell is part of how it works. Expect 1-2kg in the first week of loading. It sits inside the muscle cells, which is a different thing from the puffy bloat athletes picture. If you'd still prefer to avoid it near a race, saturate 6-8 weeks out on a low daily dose and skip loading entirely.
Keep taking it through race week. Muscle stores wash out over roughly 4 weeks, so a creatine taper just gives back the benefit you spent a month building.
What to buy, and what to ignore
Creatine monohydrate. That's the answer.
Almost all the research uses monohydrate. Hydrochloride, buffered forms, magnesium chelate and creatine blends all cost more, and none of them have beaten monohydrate in head-to-head trials. Micronised monohydrate is the same molecule ground finer so it mixes better, and that's the only upgrade worth paying for.
Check the label gives the form and the dose per serving. A product that says "creatine matrix" without printing grams is telling you something.
Interval's Creatine Monohydrate is 300g for £12.99, which gives you 100 servings at 3g a day. Stir it into water, coffee or whatever you're already drinking. Taking it every day matters more than what you take it in.
Who should be careful
Creatine is well tolerated by healthy adults in trials lasting up to five years. The kidney damage claim has been tested repeatedly in people with normal kidney function and hasn't held up.
If you have existing kidney disease, speak to your doctor before starting. If a loading dose upsets your stomach, split it into smaller portions with food, or switch to the slow load and accept the longer wait.
Plenty of reputable manufacturers have their creatine batch tested through schemes like Informed Sport. If you compete in a tested category, buy from a brand that batch tests.
The honest summary
Creatine helps you on the stations. It costs about 13p a day at 3g, it's the best-evidenced supplement in the category, and it takes a month of daily use before it does anything.
Start it during a training block, well before race week. Take 3-5g daily. Buy monohydrate. Then keep taking it, because the athletes who get results from creatine are the ones who take it without thinking about it.
Sources
- Kreider RB et al. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. J Int Soc Sports Nutr. 2017;14:18.
- Hultman E et al. Muscle creatine loading in men. J Appl Physiol. 1996;81(1):232-237.