Does Creatine Make You Gain Weight? What 143 Trials Show

This is the question I hear most in clinic the week someone starts creatine: has the scale moved because of fat, or something else.

Yes, but rarely as fat. A five to seven day loading phase of 20g a day typically adds one to three kilograms, mostly water drawn into muscle, while a pooled analysis of 143 randomised trials found an average body mass gain of 0.86kg with no meaningful change in fat mass. Taking three to five grams a day without loading makes the increase smaller and more gradual.

You might be about to start, having heard that creatine "makes you gain weight." Or you might already be taking it, watching the number creep up in week one. The search itself, "does creatine make you gain weight," is really two questions in one: how much, and whether any of it is fat.

This guide is built on the largest pooled analysis of creatine and body composition to date, 143 randomised controlled trials, published in the Journal of the International Society of Sports Nutrition in 2024, and on the trials that measured where the extra water goes, reviewed by Clemmie Rose (dipNT, mBANT). Where the researchers have ties to creatine manufacturers, this article says so. For the full picture beyond the scale question, our complete guide to creatine covers dosing, timing and safety in one place.

Yes, most people gain some weight on creatine, and almost none of it is fat. Your muscle cells pull in extra water alongside the creatine you store, showing on the scale within days. If you are training consistently, you also build real lean tissue over weeks and months, which is weight too, not the kind worth worrying about.

What creatine does not do, according to the largest dataset available, is add meaningful body fat. The 2024 meta-analysis of 143 trials found fat mass changed by only 0.05kg on average, not statistically significant. Whatever is moving your scale, it is unlikely to be fat.

The number depends on which protocol you are following, and this is where most competing pages fall down: they quote one figure as if it applies to everyone. It does not.

If you load, 20g a day split into four doses for five to seven days, expect one to three kilograms that first week, almost all water retained inside your muscle cells. Skip loading and take three to five grams a day instead, and the same total rise in muscle creatine still happens, over about four weeks instead of one, so your scale moves more slowly and less dramatically.

Across the pooled 143-trial dataset, the average total gain, loading or not, settled at 0.86kg (95% confidence interval 0.76 to 0.96kg), or roughly 1.9lb. That effect held regardless of your age, sex, training status, trial length, dose or creatine type. For the day-to-day mechanics of how dose size changes what you feel on the scale, see our guide to how much creatine per day.

Creatine pulls water into your muscle cells, not under your skin or into your gut. This is intracellular water retention, and it is the mechanism behind almost every kilogram this guide discusses.

Two trials measured this directly, and the results matter for what you might be feeling on your skin. Powers and colleagues gave 32 adults a week of loading followed by three weeks of maintenance and found total body water rose while fluid distribution between inside and outside the cells stayed unchanged. Ribeiro and colleagues followed 27 resistance-trained men for eight weeks and found the ratio between intracellular water and muscle mass held constant even as both rose together.

The pooled 143-trial dataset breaks the 0.86kg total down further: fat-free mass, water plus muscle protein together, rose by 0.82kg, while fat mass moved by only 0.05kg, not a statistically meaningful change. If you train with resistance work while taking creatine, some of that fat-free mass is genuine muscle protein you have built, not just fluid, and that is exactly what you are training for.

The timeline matters as much as the total, and it decides how fast your scale moves, not just how far. A classic trial by Hultman and colleagues found that loading, 20g a day, raises muscle creatine content by roughly 20 percent within six days. That fast change is why the scale jump during a loading week feels so sudden.

Skip loading and take three grams a day instead, and the same trial found you reach that same 20 percent rise in muscle creatine after about 28 days. Your scale still moves, because the water still arrives, but gradually enough that most people do not notice a dramatic jump. If the number on your scale worries you, this is the simplest lever you have: the creatine loading phase is optional, and skipping it changes the shape of the curve, not the destination.

No trial that has measured where creatine's water goes has found it sitting under your skin, in your face or across your stomach. The fluid-distribution studies above, Powers and Ribeiro, looked specifically for this and found the water stays inside muscle cells, not in the subcutaneous layer that would change how your face or midsection looks.

If you feel bloated in your stomach, the more likely explanation is gastrointestinal, not fluid retention. A trial by Ostojic and Ahmetovic gave 59 male athletes creatine over 28 days and found a single large 10g dose caused diarrhoea in 55.6 percent of participants, against 28.6 percent on the same total dose split into two smaller 5g servings. Splitting your dose is the practical fix if your stomach reacts.

You may have seen creatine HCl marketed as the "less bloating" alternative to monohydrate. There is no head-to-head trial evidence that it reduces water retention, and our full comparison, creatine monohydrate vs HCL, sets out why the claim outruns the data.

No. The same Hultman trial that measured how fast creatine loads also measured what happens when you stop: muscle creatine content returned to your pre-supplementation baseline within about 30 days of stopping. The water that arrived with it leaves alongside it.

What does not reverse is any muscle you built while training on creatine, provided you keep training. If you stop creatine and the scale drops, you may look slightly less full through your muscles, because some of that intracellular water is gone, but that is not losing the fitness or strength you built. It is worth being honest about that distinction rather than letting you assume you have lost fat you never gained.

Creatine will not make the scale go down on its own. In the 143-trial meta-analysis, body fat percentage fell by an average of 0.28 percentage points, statistically real but practically tiny. This is not a fat-loss supplement, whatever your training goal.

Where creatine may help indirectly is in a deficit, when preserving muscle is the harder part of the job. In adults aged 50 and over, a meta-analysis of 19 studies found creatine plus resistance training linked to around 0.5kg more fat lost than training alone, though not statistically significant. The consistent finding: creatine supports the training that protects your muscle in a deficit, rather than burning fat itself.

If you are in a deficit, your protein intake matters at least as much as your creatine dose, and our guide to the best protein powder for weight loss covers that side of the equation.

One downside worth knowing before you start: large single doses can cause the gastrointestinal upset described above. For the fuller picture of every reported side effect, not just the scale, our guide to creatine side effects covers the rest.

Once the scale question stops being the blocker, the buying question is usually next. Our ranked picks for the best creatine cover monohydrate formulations across the market, our best creatine for women guide accounts for the lower typical dose most women need, and if capsules and powder are not for you, best creatine gummies UK is the format-specific alternative.

You have three practical levers to keep the number on your scale small. Skip the loading phase and start at three to five grams a day. Split any dose above five grams into two smaller servings.

Track your weight as a weekly average rather than a daily reading, since day-to-day fluctuation from food, sodium and hydration will otherwise drown out the real signal.

Here is the rule that distinguishes creatine water from energy-balance weight gain: creatine's water effect plateaus. Once you reach saturation, roughly a week loading or a month without, your scale should stabilise. If your weight keeps climbing well past that point, and your waist measurement is growing with it, that pattern points to your calorie intake, not your creatine dose.

A tape measure around your waist and a scale reading are more honest together than either is alone. Clemmie Rose, who heads the Kyros Project nutrition clinic for Google DeepMind, uses the same rule with clients: biomedical testing and body composition, not the scale reading alone, decide whether a change is real.

It is fair to ask whether the research reassuring you that creatine is safe was written by people with a stake in you believing it. Several authors of the two most-cited creatine misconception reviews, including the 2021 and 2024 to 2025 papers, and one author of the 143-trial meta-analysis itself, declare seats on the Scientific Advisory Board of Alzchem, a manufacturer of Creapure branded creatine. That is a real conflict of interest, and you deserve to know it, not find it buried in a disclosures page you were never shown.

It does not mean the findings are wrong for you or anyone taking creatine today. The 2020 meta-analysis of adverse outcomes in female creatine users, run by de Guingand and colleagues with no declared conflicts, and the earlier Hultman and Powers trials from 1996 and 2003, all point the same direction independently. Independent evidence reaching the same conclusion as industry-linked evidence is a stronger position than either on its own, and it is the reason this guide is comfortable telling you these numbers plainly.

One popular piece of advice you may have read, cutting salt and carbohydrate to lose creatine water, has no direct trial evidence behind it. Cutting carbohydrate lowers your scale weight mainly by lowering glycogen and its bound water, a different effect entirely and not a creatine fix.

Yes, your scale can still move even if you never train, because the water retention mechanism does not depend on exercise. A study by Pashayee-Khamene and colleagues found body mass rose regardless of exercise type, or no exercise at all, which the researchers themselves flagged as counterintuitive but consistent across the dataset.

What does depend on training is the muscle. A separate meta-analysis of 35 trials and 1,192 participants by Delpino and colleagues found lean mass rose by 1.10kg when creatine was paired with resistance training, but by only 0.03kg without any exercise, a result too small to call statistically meaningful. If you want the muscle-building side of creatine, not just the water, your training programme is doing that work, not the supplement alone.

Your protein intake matters here too: our guide to how much protein per day for muscle covers the other half of that equation.

Less than the internet suggests, and if you are deciding whether to start, the best available evidence here is reassuringly specific. De Guingand and colleagues pooled 29 studies covering 951 female participants monitoring adverse outcomes and found no statistically significant difference in weight gain among women taking creatine, with the estimate ranging from a slight loss to under three kilograms across different comparisons.

Part of the reason may be biological. Smith-Ryan and colleagues note that women typically carry 70 to 80 percent lower natural creatine stores than men, which can change how your body responds to supplementation versus male-dominated study populations. Our dedicated guide to creatine for women covers dosing specific to that lower baseline, and its scale-weight figure, under one kilogram for most women, is consistent with everything here.