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Does Creatine Make You Gain Weight?
Yes, by about a kilogram, and almost all of it is water inside your muscles. Across trials, people taking creatine gain on average 0.8 to 0.9 kg in the first few weeks. That water sits inside muscle cells, not under the skin, so it does not make you look puffy. Over months of training, creatine adds roughly another kilogram of lean mass on top of what training alone gives. It does not add fat. If you have gained a lot more than a kilogram since starting, creatine is not the main reason.
- Typical early gain: 0.8 to 1 kg of water, mostly within the first fortnight
- Where the water goes: inside muscle cells; fluid distribution in the body does not change
- Fat: no increase in trials, and no meaningful decrease either
- Belly, face, double chin: not affected
- Does it go away? The water leaves within two to four weeks of stopping; any lean mass you trained for stays
How much weight do you gain from creatine, in kilograms?
Less than most people fear, and it is a direct consequence of what creatine does. A 2024 analysis pooling 143 randomised trials found creatine raised body mass by an average of 0.86 kg compared with placebo.1 A 2025 analysis of 61 trials in people doing resistance training put the figure at 0.89 kg.2 In short loading studies, where people take about 20 g a day for a week, the average rise is 0.79 kg.3
Those are averages. Larger, more muscular people hold more creatine and therefore more water, so a 95 kg man may see 1.5 kg; a 60 kg woman may see half a kilogram or nothing she can detect. It arrives faster with a loading phase and more gradually at 3 to 5 g a day, but ends up in the same place. What to expect week by week is here.
Evidence: strong. Consistent across thousands of trial participants and every dosing protocol.
Why does creatine cause water retention?
Because creatine is osmotically active: when muscle cells take it up, water follows to keep the concentration balanced. A 1996 study showed muscle creatine rises about 20% with supplementation,4 and a 2003 study measured what that does to body water directly. Thirty-two men and women took creatine or placebo for 28 days. The creatine group gained body mass and total body water, but the split between water inside cells and water outside them did not change.5
That last point matters more than it sounds. The puffiness people associate with "water retention", the kind that shows in the face, ankles and under the skin, is extracellular water. Creatine does not increase it. The water it adds is intracellular, inside the muscle, which is why muscles on creatine tend to look fuller rather than softer.
"Water retention" is also the wrong frame for something that is part of the mechanism. A better-hydrated muscle cell is the environment in which creatine does its work. If you load, the water arrives in a week rather than a month, which is one reason loading can feel more dramatic than it is.
Why did I gain 10 pounds after taking creatine?
Not from the creatine, or not mostly. Ten pounds is about 4.5 kg, roughly five times the average effect in trials. Creatine's share of that is probably a kilogram. The rest has other explanations, and starting creatine often coincides with them:
- A new training programme. Starting or stepping up resistance training raises muscle glycogen, and each gram of glycogen holds about 3 g of water. That alone can add 1 to 2 kg in the first weeks.
- Eating more. People who start taking training seriously often start eating more, deliberately or not. Harder training also raises appetite.
- More carbohydrate and salt. Both shift water quickly and both tend to rise with a "bulking" mindset.
- Normal fluctuation. Body weight swings 1 to 2 kg day to day with food, fluid, bowel contents and, for women, the menstrual cycle. Weighing yourself at different times of day makes it worse.
- Actual fat gain, if the calorie surplus has gone on for weeks. Creatine has effectively no calories and cannot do this on its own.
The same answer applies to "Can you gain 5 kg from creatine?" Not from the creatine. Look at the rest of what changed at the same time.
Does creatine make you gain belly fat?
No. Creatine contains no usable calories and does not alter how your body stores fat. In the 2025 pooled analysis of 61 trials, creatine had no effect on fat mass or body fat percentage.2 No trial has reported fat gain attributable to creatine.
If your stomach looks bigger in the first weeks, two things may be happening. Larger doses, especially during loading, can cause bloating and gut discomfort in some people, which is a digestive effect and passes when the dose is split or reduced. And if you are weighing more, it is natural to read any softness as fat. It is water in your muscles, not fat on your middle. Every real and imagined side effect of creatine is weighed here.
Does creatine burn belly fat?
Also no, and anyone selling it to you on that basis is wrong. Creatine is not a fat burner. What the evidence shows is more modest and more indirect. When people combine creatine with resistance training, they gain a little more lean mass than with training alone, about 1 kg over a typical trial.6 Because body fat percentage is a ratio, more lean mass nudges the percentage down slightly even when fat itself has not changed. A 2023 analysis in adults under 50 found exactly this: a very small drop in body fat percentage with no reduction in absolute fat mass.7 In adults over 50 the picture is similar, with about half a kilogram less fat that did not reach statistical significance.8
So creatine does not reduce belly fat. It may help you train harder, and training is what changes body composition.
Evidence: strong that creatine does not add fat. Moderate that any effect on fat is small to nil.
Should I take creatine if I'm trying to lose weight?
You can, and there is a reasonable case for it. Losing fat means a calorie deficit, and a deficit makes training harder and muscle harder to keep. Creatine supports performance in short, intense efforts, which is precisely the kind of training that protects muscle while you diet. It will not speed up fat loss, but it may help you keep what you want to keep.
The one practical problem is the scale. Creatine will hold about a kilogram of water that was not there before, so the number will read higher than your fat loss alone would suggest, and for the first fortnight it may not move at all. If the scale matters to your motivation, either start creatine before the diet so the water is already in, or judge progress by waist measurements, photos and how your clothes fit. Those are better measures anyway.
Will I look puffy on creatine? What about my face?
No. The puffy face, double chin and swollen look people worry about come from extracellular water, and creatine does not raise it.5 Nor does it make your face leaner. If your face has changed since you started, look at salt, alcohol, sleep, overall weight change and the menstrual cycle.
Does creatine weight gain go away?
The water stays as long as you keep taking creatine, because the muscle stores stay full. If you stop, muscle creatine returns to baseline over about 30 days and the water leaves with it, mostly in the first two to three weeks.4 Any lean mass you gained through training does not disappear. What happens when you stop, week by week, is here.
What the scale will show
| When | What changes | How much | Is it fat? |
|---|---|---|---|
| Weeks 1 to 2 | Water inside muscle cells | 0.8 to 1 kg on average; more if you are heavily muscled, less if you are small | No |
| Weeks 2 to 4 | Little further change from creatine itself | Plateau | No |
| Months 1 to 3, with resistance training | Lean mass, over and above training alone | About 1 kg | No |
| Any time | Fat | No change attributable to creatine | Not from creatine |
| After stopping | Muscle water leaves | The early kilogram, gone within about a month | Lean mass stays |
What we don't know
- Why individuals vary so much. The averages hide a range from no detectable change to 2 kg. Muscle mass, diet and baseline creatine stores explain some of it, not all.
- Whether creatine has any direct effect on fat metabolism. Mechanisms have been proposed and the trial data is equivocal; the honest summary is "small, if anything".
- Water changes in women across the menstrual cycle. Trials rarely control for cycle phase, and women already experience water shifts of 1 kg or more across a cycle, which can mask or mimic creatine's effect. The evidence on creatine in women is here.
Frequently asked questions
Can creatine cause weight gain?
Yes: about a kilogram of muscle water, and with training, about a kilogram of lean mass over a few months. Not fat.1, 2
Can I take creatine while trying to lose belly fat?
Yes. It will not slow fat loss and may help you keep muscle while dieting. Expect the scale to read about a kilogram higher than your fat loss alone would show.
Will creatine water weight go away?
Only if you stop taking it, in which case it leaves over two to four weeks.4 While you take it, it stays, because it is doing the job.
Sources
- Pashayee-Khamene F, et al. Creatine supplementation protocols with or without training interventions on body composition: a GRADE-assessed systematic review and dose-response meta-analysis. Journal of the International Society of Sports Nutrition, 2024. PubMed 39042054.
- Ashtary-Larky D, et al. Creatine supplementation and resistance training: a comparison between novice and experienced lifters. A systematic review and dose-response meta-analysis. Journal of the International Society of Sports Nutrition, 2025. PubMed 41433021.
- Glaister M, Rhodes L. Short-term creatine supplementation and repeated sprint ability: a systematic review and meta-analysis. International Journal of Sport Nutrition and Exercise Metabolism, 2022. PubMed 36041731.
- Hultman E, Söderlund K, Timmons JA, Cederblad G, Greenhaff PL. Muscle creatine loading in men. Journal of Applied Physiology, 1996. PubMed 8828669.
- Powers ME, et al. Creatine supplementation increases total body water without altering fluid distribution. Journal of Athletic Training, 2003. PubMed 12937471.
- Desai I, et al. The effect of creatine supplementation on resistance training-based changes to body composition: a systematic review and meta-analysis. Journal of Strength and Conditioning Research, 2024. PubMed 39074168.
- Candow DG, Prokopidis K, Forbes SC, Rusterholz F, Campbell BI, Ostojic SM. Resistance exercise and creatine supplementation on fat mass in adults under 50 years of age: a systematic review and meta-analysis. Nutrients, 2023. PubMed 37892421.
- Forbes SC, Candow DG, Krentz JR, Roberts MD, Young KC. Changes in fat mass following creatine supplementation and resistance training in adults 50 years of age and over: a meta-analysis. Journal of Functional Morphology and Kinesiology, 2019. PubMed 33467377.
This article is general information, not medical advice. If you have a medical condition or take regular medication, check with your GP or pharmacist before starting creatine.
