Roughly 10,000 searches a month ask whether creatine helps with weight loss. The meta-analyses give an answer that sounds like yes and reads like no: body fat percentage goes down a little, body weight goes up a little, and fat mass in kilograms mostly does not move. The fat-burning mechanism behind the claim is real in mice and has not shown up in the one human trial designed to find it. This is research journalism and contains no usage guidance, per our editorial standards.
What three meta-analyses report
| Meta-analysis | Population | Body fat % | Fat mass (kg) | Body mass |
|---|---|---|---|---|
| Pashayee-Khamene et al. 2024 | 143 RCTs, all ages | −0.28 points (CI −0.47 to −0.09) | not in abstract | +0.86 kg (CI 0.76 to 0.96) |
| Candow et al. 2023 | 12 studies, 266 adults under 50, with resistance exercise | −1.19 points (p = 0.006) | −0.18 kg, p = 0.76 — no difference | not in abstract |
| Forbes et al. 2019 | 19 studies, 609 adults 50 and over, with resistance training | −0.55 points (p = 0.04) | ~−0.5 kg, p = 0.13 — not significant | not in abstract |
Sources: Pashayee-Khamene et al., J Int Soc Sports Nutr 2024, PMID 39042054; Candow et al., Nutrients 2023;15(20):4343, PMID 37892421; Forbes et al., J Funct Morphol Kinesiol 2019;4(3):62, PMID 33467377.
Every one of them reports a lower body fat percentage. Neither of the two in this table that report fat mass in kilograms found a statistically significant loss. The 2023 paper says it in its own conclusion: a very small reduction in body fat percentage "without a corresponding decrease in absolute fat mass."
A fourth pooled analysis, of 12 trials in adults under 50, did report a fat mass reduction of 0.73 kg alongside 1.14 kg of added lean mass (Desai et al., J Strength Cond Res 2024, PMID 39074168). The fat-mass evidence is therefore mixed rather than absent — but none of it describes weight coming off the scale.
Why the percentage can fall while fat stays put
Body fat percentage is fat mass divided by total body mass. Creatine reliably raises total body mass. So the percentage can drop with no fat lost at all:
| 80 kg person, 16 kg fat (20%) | Total mass | Body fat % | Change |
|---|---|---|---|
| Baseline | 80.00 kg | 20.00% | — |
| + 0.86 kg non-fat mass, fat unchanged (143-trial average) | 80.86 kg | 19.79% | −0.21 points |
| + 1.14 kg non-fat mass, fat unchanged (12-trial lean-mass figure) | 81.14 kg | 19.72% | −0.28 points |
Our arithmetic, applying the meta-analysed mass changes to an illustrative person. It is not a figure from any of the papers.
On those numbers, the denominator alone accounts for about three-quarters of the 0.28-point reduction across 143 trials. It accounts for much less of the 1.19-point reduction reported in adults under 50, so that result is not simply an artefact — but its authors still found no significant fat mass change behind it. The honest reading is that a percentage figure should not be quoted as fat loss unless the kilogram figure agrees.
The scale goes the other way
Across 143 trials the average body mass change was +0.86 kg. That is the opposite of what most people searching this question are hoping for, and it happens on the same days the store fills — we trace what that mass is made of, and why two measurement methods disagree about it, on does creatine make you gain weight.
Whether creatine helps preserve muscle during deliberate weight loss is a different question with even less evidence: two small randomised trials, pointing in opposite directions, which we set side by side on creatine while cutting.
The mechanism: strong in mice, absent in the one human test
The reason creatine is linked to fat burning at all is a line of mouse research. Thermogenic fat cells appear to use creatine in a futile cycle — phosphorylating and dephosphorylating it to burn energy as heat. In 2021, researchers at McGill and Harvard showed that deleting the enzyme creatine kinase B from mouse fat cells reduced thermogenic capacity and increased predisposition to obesity (Rahbani et al., Nature 2021;590:480–5, PMID 33597756).
That shows removing the machinery harms mice. It does not show adding creatine helps humans, and when a group at Maastricht tested exactly that, they found nothing. In a double-blind crossover trial, 14 young vegetarian adults — chosen because vegetarians have low creatine levels, where any effect should be largest — took 20 g of creatine monohydrate a day or placebo. Brown fat activation after cold exposure, measured by PET-MRI, did not differ: SUVmean −0.34 (95% CI −0.97 to 0.28, p = 0.254) (Connell et al., Nat Metab 2021;3:107–17, PMID 33462512; NCT04086381). Two of the mouse study's senior researchers are co-authors of the null human trial.
Two years later, a review in the same journal went further. Its authors, both at the Buck Institute, examined the experimental basis for the futile creatine cycle and concluded "there is currently no convincing evidence for a significant futile creatine cycle in these tissues" (Nicholls & Brand, Nat Metab 2023;5:21–8, PMID 36624158). The question is open in the basic science. It is not open in the direction of a human weight-loss effect, because nobody has measured one.
Who wrote the fat mass papers
The 2019 meta-analysis declares no conflicts of interest. The 2023 meta-analysis declares that its first author serves on the Scientific Advisory Board of Alzchem, a company that manufactures creatine, has conducted industry-sponsored creatine research and acts as an expert witness in creatine cases, and that a co-author is a scientific advisor to a creatine gummy company. Both statements are printed in the papers. The 2023 paper's headline finding is nonetheless the null one: no fat mass difference. We covered the same manufacturer's unsuccessful health-claim application to the European Food Safety Authority on creatine benefits.
What can honestly be said
- Body weight rises on creatine, by about 0.86 kg on average across 143 trials.
- Body fat percentage falls slightly, by 0.28 to 1.19 points depending on the population.
- Fat mass in kilograms did not fall significantly in the two meta-analyses that tested it in adults under 50 and adults 50 and over; a third pooled analysis did report −0.73 kg.
- Much of a small percentage drop can be arithmetic: adding non-fat mass lowers the percentage with no fat lost.
- The fat-burning mechanism is a mouse finding. The one human trial designed to detect it, at 20 g a day in vegetarians, found no effect, and a 2023 review found no convincing evidence the cycle is significant.
This page reports what trials measured. It contains no recommendation, and decisions about weight management and supplementation belong with a clinician.
Sources
- Pashayee-Khamene F, Heidari Z, Asbaghi O, et al. Creatine supplementation protocols with or without training interventions on body composition: a GRADE-assessed systematic review and dose-response meta-analysis. J Int Soc Sports Nutr 2024;21(1):2380058 — PMID 39042054 · doi:10.1080/15502783.2024.2380058
- Candow DG, Prokopidis K, Forbes SC, Rusterholz F, Campbell BI, Ostojic SM. Resistance exercise and creatine supplementation on fat mass in adults < 50 years of age. Nutrients 2023;15(20):4343 — PMID 37892421 · doi:10.3390/nu15204343
- 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. J Funct Morphol Kinesiol 2019;4(3):62 — PMID 33467377 · doi:10.3390/jfmk4030062
- Desai I, Wewege MA, Jones MD, et al. The effect of creatine supplementation on resistance training-based changes to body composition. J Strength Cond Res 2024;38(10):1813–21 — PMID 39074168 · doi:10.1519/JSC.0000000000004862
- Rahbani JF, Roesler A, Hussain MF, et al. Creatine kinase B controls futile creatine cycling in thermogenic fat. Nature 2021;590(7846):480–5 — PMID 33597756 · doi:10.1038/s41586-021-03221-y
- Connell NJ, Doligkeit D, Andriessen C, et al. No evidence for brown adipose tissue activation after creatine supplementation in adult vegetarians. Nat Metab 2021;3(1):107–17 — PMID 33462512 · doi:10.1038/s42255-020-00332-0 · NCT04086381
- Nicholls DG, Brand MD. A critical assessment of the role of creatine in brown adipose tissue thermogenesis. Nat Metab 2023;5(1):21–8 — PMID 36624158 · doi:10.1038/s42255-022-00718-2
All sources retrieved 2026-09-17. Digital object identifiers verified by content negotiation on the same date.