Short answer
Yes, you can use a sauna while taking creatine. Sauna sweating is not known to meaningfully deplete muscle creatine stores; creatine leaves the body mainly through the kidneys, not through sweat. The one thing that matters is fluid: creatine increases body water, and a sauna session costs you a noticeable amount of sweat, so start hydrated and replace what you lose. Take your creatine whenever you normally do; timing around the sauna makes no measurable difference.
Creatine and sauna are both popular with people who train, and the two questions come up together: does the heat undo the supplement, and does the supplement make the heat riskier? The short version is no on both counts, with one practical caveat about hydration. This guide explains what actually happens, what the research says about creatine and heat, and how to combine the two sensibly.
Key takeaways
- Sauna sweating is not known to meaningfully deplete muscle creatine. What you lose in the sauna is water and electrolytes.
- Creatine increases body water as muscle stores rise; there is no evidence that a sauna session selectively reverses that effect.
- Research on athletes exercising in heat has not found that creatine increases dehydration, cramping or heat-illness risk.
- Sweat loss in a sauna varies a lot between people; weighing yourself before and after a session is the only reliable way to know your own number.
- People with kidney disease should discuss creatine with a doctor regardless of sauna use.
Does sweating in the sauna make you lose creatine?
Not in any way that matters. Most of the creatine in your body is stored in muscle as phosphocreatine, where it helps regenerate ATP for short, hard efforts. Creatine turnover and excretion happen primarily through conversion to creatinine, which the kidneys filter into urine; excess supplemental creatine can also be excreted unchanged in urine. That renal route is the exit, and it runs at the same pace whether you sit in a sauna or not. Sauna sweating is not known to meaningfully deplete muscle creatine stores, so a session in the sauna, however long, does not “sweat out” your loading phase.
What you do lose is water and electrolytes, chiefly sodium. That matters for the hydration section below, but it has nothing to do with whether your muscles are still saturated with creatine when you leave the sauna.
Creatine, water retention and the sauna
Creatine supplementation can increase body water, particularly as muscle creatine stores rise, which is why the scale often goes up 1–2 kg in the first week of taking it. A sauna causes acute body-water loss through sweating. There is no evidence that a sauna selectively reverses the water-related effects of creatine supplementation; a session simply leaves you somewhat dehydrated overall until you drink.
Two practical consequences. First, anyone using the sauna to “drop water weight” before a weigh-in should know that what comes off is sweat, and that it returns as soon as you rehydrate; see how much weight can you lose in a sauna. Second, because creatine has already increased your body water, it is sensible to start the sauna normally hydrated rather than assume you have a buffer.
Does creatine make the sauna more dangerous?
This was a real concern in the early 2000s, when creatine was rumoured to cause cramping and heat illness. It has been studied directly since. A meta-analysis in the Journal of Athletic Training pooled ten studies of exercise in the heat and found that creatine did not impair thermoregulation or hydration status; if anything, the creatine groups tended to hold core temperature and heart rate slightly better (Lopez et al., 2009). The International Society of Sports Nutrition’s position stand reaches the same conclusion: creatine does not increase the risk of dehydration, cramping or heat-related problems, and there is no evidence of kidney harm in healthy people at recommended doses (Kreider et al., 2017).
What we know vs. what we don’t
We know: creatine is one of the most-studied supplements in sports nutrition, and the exercise-in-heat research has not found an increased risk of dehydration or heat illness in creatine users.
We don’t know: to our knowledge there is no high-quality study that has tested long-term creatine supplementation directly in regular sauna users against a placebo. The reassurance above is strong indirect evidence, not direct proof.
The practical reading is that creatine users have no reason to avoid the sauna, but also no reason to skip the ordinary rules: hydrate, keep sessions reasonable, leave if you feel dizzy or nauseous, and do not combine the sauna with alcohol. If you have kidney disease, take diuretics, or have been told to watch your creatinine levels, ask your doctor before starting creatine at all; the sauna is not the deciding factor.
Hydration: the part that actually matters
How much you sweat in a sauna depends on temperature, duration, humidity, how used to the heat you are and simple individual variation, and published measurements range widely even for similar protocols. Creatine does not change that, but a dehydrated body tolerates heat worse and recovers more slowly, so the margin is worth respecting.
The most useful thing you can do is measure yourself: weigh yourself immediately before and after a session you can repeat (same sauna, same rounds, dry off first, empty bladder). The difference is a good personal estimate of your sweat loss, and general hydration guidelines recommend exactly this kind of individual measurement because sweat rates differ so much between people.
For an ordinary sauna session, thirst, normal meals and replacing the fluid you lost are usually practical enough guides. If rapid rehydration matters after substantial sweating, for example after a hard workout followed by several rounds with steam, sports-hydration research often uses fluid intake above the measured loss together with sodium; a pinch of salt in the bottle, an electrolyte drink, or simply a salty meal afterwards helps you retain what you drink. Our guide on drinking water in the sauna goes into timing and amounts.
Creatine before or after the sauna?
It does not matter. Creatine works by saturating your muscles over days and weeks, not by being present at a particular moment, so the timing of a 3–5 g daily dose relative to a sauna session is irrelevant. Take it when you reliably remember, typically with a meal or your post-workout shake. The only reason to take it “after” is if you like to mix it in the drink you use to rehydrate, which is a perfectly good habit.
The more useful question is when to schedule the sauna relative to training. If you combine them in the same session, sauna after training is often the more practical order, because the heat exposure then cannot fatigue or dehydrate you before the workout; sauna before or after a workout and sauna after a workout cover the reasoning.
A simple routine for training days
Keep your usual 3–5 g creatine routine; nothing changes on sauna days. Start the session normally hydrated, use your normal sauna duration, and replace the fluid you lost afterwards. After a hard workout or a long, hot sauna session, food or a drink containing sodium may help replace electrolyte losses. If you feel light-headed at any point, drink and lie down before doing anything else.
Steam room and infrared cabin: any difference?
Not for creatine. A steam room at around 45 °C and near-100 % humidity makes you sweat quickly, an infrared cabin at around 55 °C makes you sweat more slowly over a longer session, and a traditional sauna sits between them. Your muscle creatine is unaffected by all three; only the sweat volume, and therefore how much you need to drink, differs. If you want to compare the experience, read infrared vs. traditional sauna.
Frequently asked questions
Does sauna cancel out creatine?
No. Sauna sweating is not known to meaningfully deplete muscle creatine; the sauna removes water and electrolytes, which you replace by drinking.
Do you sweat out creatine?
Not in any meaningful amount. Creatine leaves the body primarily through the kidneys, as creatinine and, with higher supplemental doses, partly as unchanged creatine in urine, sauna or not.
Should I stop creatine on sauna days?
There is no reason to. Keep your daily dose constant; that is what keeps muscle stores saturated.
Does creatine plus sauna increase kidney risk?
Not in healthy people at recommended doses, according to the ISSN position stand and the studies behind it. Dehydration raises creatinine readings on a blood test temporarily, which can look alarming but is not kidney damage. If you have existing kidney disease, talk to your doctor about creatine itself.
Does the sauna help creatine “work better”?
There is no evidence for that. The sauna has its own recovery and relaxation benefits; creatine has its own strength benefits. They are compatible, not synergistic.
Can I use a sauna during a creatine loading phase?
Yes. The extra 20 g a day during loading increases body water further and sometimes causes mild stomach upset; drink a little more than usual and keep sauna sessions moderate that week.
Sources
- Kreider RB et al. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. Journal of the International Society of Sports Nutrition. 2017;14:18. pubmed.ncbi.nlm.nih.gov
- Lopez RM, Casa DJ, McDermott BP, Ganio MS, Armstrong LE, Maresh CM. Does creatine supplementation hinder exercise heat tolerance or hydration status? A systematic review with meta-analyses. Journal of Athletic Training. 2009;44(2):215–223. pubmed.ncbi.nlm.nih.gov
- Laukkanen JA, Laukkanen T, Kunutsor SK. Cardiovascular and other health benefits of sauna bathing: a review of the evidence. Mayo Clinic Proceedings. 2018;93(8):1111–1121. pubmed.ncbi.nlm.nih.gov
- Hussain J, Cohen M. Clinical effects of regular dry sauna bathing: a systematic review. Evidence-Based Complementary and Alternative Medicine. 2018. pubmed.ncbi.nlm.nih.gov
- American College of Sports Medicine (Sawka MN et al.). ACSM position stand: exercise and fluid replacement. Medicine & Science in Sports & Exercise. 2007;39(2):377–390. pubmed.ncbi.nlm.nih.gov
This article is for general information and is not medical advice. Talk to a doctor before starting creatine if you have kidney disease or take medication that affects fluid balance.