No. In controlled trials, including ones run on deliberately dehydrated people exercising in the heat, creatine has not worsened hydration, heat tolerance or cramping. What it does do is move water into your muscles, which is where the confusion starts, and why the scale can climb in the first week.
We do not put creatine in our formula, so we have no stake in defending it. We do sell a drink built around fluid and sodium, and that turns out to be the part of this question that is real.
Where the warning came from
The creatine-dehydrates-you idea took hold in the late 1990s, when creatine went mainstream in college locker rooms faster than the research could keep up.
Two things fed it. The first was a tragedy. In late 1997, three college wrestlers died within weeks of each other while cutting weight, and some coverage at the time suggested the deaths "may be linked" to creatine, as one campus paper put it in August 1998. The CDC's report on those deaths describes something else entirely: wrestlers restricting food and fluid, wearing vapour-impermeable suits under warm-ups and exercising hard in hot rooms to shed up to 15 pounds in hours. The report does not mention creatine supplementation at all.
The second was self-report. A 1999 survey of 52 college athletes in the Journal of the American Dietetic Association asked creatine users what side effects they noticed, and muscle cramping came second only to diarrhoea. There was no comparison group, so there was no way to know how often those same athletes would have cramped without it.
A plausible story plus a frightening coincidence is how a myth gets built. Neither is a controlled comparison.
What creatine actually does with water
Creatine is osmotically active. When your muscle cells take it up, water follows it in. The protein that pulls creatine into the cell is a sodium-coupled transporter, moving sodium in the same direction as the creatine it carries, according to structural work on the transporter.
The International Society of Sports Nutrition's position stand puts the size of this effect at roughly 0.5 to 1.0 litre of retained fluid during a loading phase, broadly in proportion to the weight people gain in that first week. A 2021 review of common creatine misconceptions adds the detail that matters: where retention shows up in the short term, it is mainly inside the cell, and several studies found no change in total body water at all.
Intracellular water is the fluid held inside your cells, as opposed to the fluid in your blood and the spaces between cells. Creatine's water effect is mostly about this compartment, which is why it reads as fuller muscle rather than puffiness.
That is the opposite of what "dehydrates you" implies. Creatine shifts water into muscle; it does not pull it out of your body. The worry was that moving water into muscle would starve the blood of it, leaving less for sweating and cooling. That is a testable prediction, and it has been tested.
What the controlled trials found
The cleanest summary is a systematic review with meta-analyses in the Journal of Athletic Training that screened the literature down to ten well-scored trials on creatine, heat and hydration. Its conclusion, in full: "No evidence supports the concept that creatine supplementation either hinders the body's ability to dissipate heat or negatively affects the athlete's body fluid balance."
One of the harder tests in that literature deliberately set out to find a problem. In a double-blind crossover trial, twelve trained men took creatine or a placebo for a week, were dehydrated by 2% of body mass through exercise, and then walked and ran for 80 minutes at 33.5°C. Core temperature, heart rate and perceived effort did not differ between creatine and placebo, and the authors reported no increase in symptoms and no compromise of hydration.
Cramping got its own test in the field. In a study that followed college football players through their training and competition, reported in the 2021 misconceptions review, the players who chose to take creatine actually had less cramping, heat illness and dehydration than those who did not. Players picked their own group, so that is not proof creatine protects anyone. It is strong evidence against the idea that it causes the problem.
| the claim | what the evidence shows |
|---|---|
| Creatine dehydrates you | It moves water into muscle; controlled heat trials found no loss of fluid balance |
| It makes you overheat | No difference in core temperature in dehydrated men exercising in the heat |
| It causes cramps | No increase in controlled work; fewer cramps among users in one football cohort |
| The first-week weight is fat or bloat | It is mostly retained water, roughly half a litre to a litre |
Why the scale goes up
If you start with a loading phase, gaining up to about a kilo on the scale in the first week is normal, and it is mostly the water described above. The ISSN describes it as short-term retention, not fat. This matters mainly for people who compete in weight classes, and it is the one practical reason some of them avoid loading close to a weigh-in. It is not a hydration problem.
For everyone else, the fuller feeling is the supplement doing exactly what it does. The loading and maintenance doses, and why a single scoop before a session does nothing for that session, are covered in our pre-workout guide.
So what does dehydrate you in training?
Sweat. That was always the real variable, and creatine never changed it.
If you train hard, in heat, for long, you lose fluid and sodium at a rate that varies several-fold between people, and plain water puts back only the fluid. The numbers, and how to estimate your own losses, live in the long-day playbook. How to put fluid back so it actually stays (sodium, a little carbohydrate, spread over a couple of hours) is in how to rehydrate fast.
And if the cramping fear is what brought you here, cramps turn out to track fatigue and pace far more than fluid, which is one more reason creatine was an unlikely culprit.
The honest version of "drink more water on creatine" is simply "drink enough for the training you do." Creatine did not add a new requirement.
Frequently asked questions
Does creatine dehydrate you? No. It draws water into muscle cells, and controlled trials, including one on dehydrated men exercising in the heat, found no worsening of hydration or heat tolerance at recommended doses.
Do you need to drink more water when taking creatine? Not because of the creatine. Drink for your training, your climate and your sweat rate, which is what drives fluid needs whether you take creatine or not.
Does creatine cause muscle cramps? The evidence says no. Controlled studies have not found an increase, and one cohort of college football players found fewer cramps among users, though players chose their own group.
Is it safe to take creatine in hot weather? The heat-specific trials found no difference in core temperature or heart rate versus placebo in healthy trained men. The heat is the risk factor to manage, with fluid and sodium, not the creatine.
Is creatine weight gain just water? Mostly, in the first week. The ISSN puts short-term retention at roughly half a litre to a litre, broadly matching the early weight gain. If you have kidney disease or take medication, speak to your doctor before starting any supplement.
Can you mix creatine into an electrolyte drink? Yes. It mixes into any drink you would finish. There is no trial showing that adding sodium improves how much creatine your muscles take up, so do it for convenience, not for an effect.
Where Snake Oil fits
There is no creatine in Snake Oil, and this article is not a way to sell you some. If creatine suits your training, the evidence says hydration is not a reason to avoid it.
What the question was really circling is the fluid and sodium that hard training costs you, and that is exactly what we built a stick around. One stick in 16 ounces gives you 370mg of sodium with 5g of dextrose, the sodium-plus-carbohydrate pairing that helps fluid stay in rather than pass straight through,† alongside potassium, magnesium, zinc and seven B vitamins. It also carries 100mg of caffeine, which is worth knowing if you are sensitive to it. If you already take creatine, stir your scoop into it or into anything else; the creatine will not mind either way.
It is for the part of recovery that is genuinely urgent after a hard, hot session: putting back what you sweated out, in a drink you will actually finish.
†These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Related reading: How to rehydrate fast · The long-day playbook · Best pre-workout: what the evidence actually supports · Homemade pre-workout: what is worth mixing