Does creatine help or hinder weight loss?

Neither, by much. In a meta-analysis of 12 studies with 266 adults under 50 who lifted weights, creatine cut body fat by 1.19 percentage points and left absolute fat mass unchanged, a difference of 0.4 lb (0.18 kg) that was not significant. The scale moves the other way. Across 61 trials, creatine with resistance training raised body weight by 2 lb (0.89 kg), with fat-free mass up 3.1 lb (1.39 kg) and no significant effect on fat mass. Taken without exercise, it did not change lean body mass at all.

Myth. Creatine is not a fat-loss supplement. Five meta-analyses of creatine with resistance training agree that any extra fat loss is small. The largest, a 2026 analysis of 63 studies in 1,489 people, found no significant change in fat mass, with an effect size of g -0.10.

Established. The weight creatine adds is lean mass and water. Across 61 trials with lifting, body weight rose 2 lb (95% CI 1.7 to 2.2; metric: 0.89 kg, 0.76 to 1.01) and fat-free mass 3.1 lb (1.39 kg), with no significant effect on fat mass, BMI or body-fat percentage. If you judge a diet by the bathroom scale, creatine will make it look slightly worse while fat mass shows no significant change.

What the trials found

Five meta-analyses looked at creatine taken alongside resistance training, and they line up on a small number. The 2023 analysis of 12 studies in 266 adults under 50 found the 1.19 point drop in body-fat percentage was significant while fat mass in kilograms did not move. A percentage can fall because lean mass grows, which is one honest reading of that pair of results.

A preregistered 2024 analysis of 12 randomized trials in adults under 50 found the most favorable result: fat mass down 1.6 lb (95% CI -3 to -0.24; metric: 0.73 kg, -1.34 to -0.11) and body fat down 0.88 percentage points against training alone. About 41 percent of those studies had some concerns of bias, and the fat-mass interval comes close to zero.

In adults aged 50 and over, a 2019 meta-analysis of 19 studies with 609 people found body fat fell 0.55 percentage points more on creatine (95% CI -1.08 to -0.03). The authors are leading creatine researchers and the effect sits at the edge of significance. The 2026 three-level analysis of 63 studies, the largest so far, found no significant change in fat mass, and its authors note that the trials reported diet and training backgrounds incompletely.

Training is the condition for any of this. A meta-analysis of 35 randomized trials in 1,192 people found that creatine without exercise changed lean body mass by 0.07 lb (95% CI -1.4 to 1.5; metric: 0.03 kg, -0.65 to 0.70). That review did not pool fat mass.

During an actual weight-loss diet

Unsettled. Almost nobody has tested creatine while people are deliberately eating less. One randomized trial gave 64 sedentary adults aged 45 to 65 creatine at 10 g a day or placebo for 12 weeks. In the diet and exercise arm creatine produced a greater fall in body-fat percentage and more lean tissue, but participants chose for themselves whether to exercise, and the abstract does not give the size of the difference. A 2001 trial put male lifters on a very low calorie diet for 4 days with 20 g a day of creatine or placebo, and both groups lost similar weight and body fat. That trial was small and very short, and it does not state that it was randomized.

Who should be careful

Not for everyone. Expect the scale to rise when you start. An expert review in the journal of the International Society of Sports Nutrition says a loading phase of 20 g a day for 5 to 7 days typically adds 2.2 to 6.6 lb (1 to 3 kg), mostly water, and its authors include creatine researchers with some industry links. In a randomized trial of 63 adults without a placebo group, 5 g a day added 1.1 lb (0.51 kg) of lean body mass within 7 days and before any training, and the scanner used counts water as lean mass. For someone weighing themselves to track a diet, that is a week or two of misleading numbers.

The same society's position stand says weight gain is the only side effect of creatine that has been consistently reported, and it does not cover people who already have kidney disease. A 2025 meta-analysis found creatine causes a small but statistically significant rise in serum creatinine, mostly in the first week, with no significant change in kidney filtration rate. Creatinine is the number a routine kidney blood test reports, so a rise can be misread as kidney damage. Tell whoever orders the test that you take creatine. That analysis was mostly in healthy people and has no data on existing kidney disease. We found no card on creatine in pregnancy, in children or alongside specific medicines, and that absence is a gap in the evidence, not a sign of safety.

What expert bodies say

The International Society of Sports Nutrition, in a 2021 expert review written by creatine researchers, concludes that creatine does not increase fat mass across a variety of populations. That is a statement about not gaining fat, and the review does not claim creatine causes fat loss. We found no government or public health agency that has taken a position on creatine and body weight. The EU register of health claims authorizes creatine claims only for physical performance and for strength in adults over 55, and none about weight or fat.

How we searched

What would change this answer

• A randomized trial of creatine inside a calorie-restricted weight-loss program, with fat mass measured by DXA as the main outcome. Every meta-analysis above pools trials in which people were not trying to lose weight.
• Results from a trial now recruiting at the University of Saskatchewan, which gives 40 people on GLP-1 weight-loss drugs creatine or placebo with 12 weeks of resistance training, with completion expected in May 2027. That is the first test of whether creatine protects muscle during drug-assisted weight loss.
• Safety data in people with existing kidney disease, which none of the sources here include.

The rest of what is known about creatine, from muscle to the brain, is on the creatine page.

Sources

1. ev-crwl-01 · Meta-analysis or systematic review · systematic review and meta-analysis of controlled trials · n = 266
   Adults (<50 years of age) who supplemented with creatine and performed resistance exercise experienced a very small, yet significant reduction in body fat percentage (-1.19%, p = 0.006); however, no difference was found in absolute fat mass (-0.18 kg, p = 0.76).
   
   Who: adults younger than 50 doing resistance exercise with creatine or placebo
   Effect: body fat -1.19 percentage points (p = 0.006); fat mass -0.4 lb (-0.18 kg) (p = 0.76, not significant)
   Certainty: Small trials; a percentage can fall when lean mass grows without less fat.
   Nutrients, 2023 · checked 2026-10-07 · we read the abstract
2. ev-crwl-02 · Meta-analysis or systematic review · systematic review and meta-analysis of RCTs, preregistered · n = 12 trials
   Compared with resistance training (RT) alone, creatine supplementation increased LBM by 1.14 kg (95% CI 0.69 to 1.59), and reduced body fat percentage by -0.88% (95% CI -1.66 to -0.11) and body fat mass by -0.73 kg (95% CI -1.34 to -0.11).
   
   Who: adults younger than 50 doing resistance training
   Effect: fat mass -1.6 lb (95% CI -3 to -0.24; metric: -0.73 kg, -1.34 to -0.11); body fat -0.88 percentage points (-1.66 to -0.11); lean body mass +2.5 lb (1.5 to 3.5; metric: 1.14 kg, 0.69 to 1.59)
   Certainty: 41% of studies had some concerns of bias; the fat-mass interval comes close to zero.
   J Strength Cond Res, 2024 · checked 2026-10-07 · we read the abstract
3. ev-crwl-03 · Meta-analysis or systematic review · systematic review and three-level meta-analysis of controlled trials · n = 1,489
   No significant difference emerged for fat mass (g = -0.10, p = 0.14).
   
   Who: adults in trials of resistance training plus creatine vs resistance training alone
   Effect: fat mass g -0.10 (p = 0.14, not significant); body-fat percentage g -0.14; body mass g 0.12
   Certainty: Diet and training backgrounds incompletely reported in the trials.
   J Int Soc Sports Nutr, 2026 · checked 2026-10-07 · we read the abstract
4. ev-crwl-04 · Meta-analysis or systematic review · systematic review and dose-response meta-analysis of controlled trials · n = 61 trials
   A pooled analysis of 61 trials revealed that Cr supplementation significantly increased FFM (weighted mean difference [WMD]: 1.39 kg; 95% confidence intereval (CI): 1.07,1.70; p < 0.001) and body mass (WMD: 0.89 kg; 95% CI: 0.76,1.01; p < 0.001) without significant effects on FM, BMI, and BFP.
   
   Who: trained and untrained adults doing resistance training with creatine or placebo
   Effect: body mass WMD +2 lb (95% CI 1.7 to 2.2; metric: 0.89 kg, 0.76 to 1.01); fat-free mass +3.1 lb (2.4 to 3.7; metric: 1.39 kg, 1.07 to 1.70); no significant effect on fat mass, BMI or body-fat percentage
   Certainty: Scale weight rises because of lean mass and water; dose linked to the rise in body mass.
   J Int Soc Sports Nutr, 2025 · checked 2026-10-07 · we read the abstract
5. ev-crwl-05 · Meta-analysis or systematic review · systematic review and meta-analysis of randomized controlled trials · n = 609
   When pooling the data, body fat percentage (mean difference = −0.55% (95% CI = −1.08, −0.03); p = 0.04) decreased to a greater extent after creatine supplementation compared to placebo.
   
   Who: adults aged 50 and over in resistance training trials of 7 to 52 weeks
   Effect: body fat MD -0.55 percentage points (95% CI -1.08 to -0.03); fat mass MD -1.1 lb (-2.5 to 0.33; metric: -0.50 kg, -1.15 to 0.15); body mass +1.9 lb (-0.71 to 4.5; metric: 0.86 kg, -0.32 to 2.05), not significant
   Certainty: Authors are leading creatine researchers; small effect at the edge of significance.
   Journal of Functional Morphology and Kinesiology, 2019, Changes in Fat Mass Following Creatine Supplementation and Resistance Training in Adults 50 Years of Age and Older: A Meta-Analysis · checked 2026-10-07 · we read the fulltext
6. ev-crwl-06 · Meta-analysis or systematic review · systematic review and meta-analysis of randomized clinical trials · n = 1,192
   There was no statistically significant effect of creatine on LBM when combined with mixed exercise (MD, 0.74 kg; 95% CI, -3.89 to 5.36) or without exercise (MD, 0.03 kg; 95% CI, -0.65 to 0.70).
   
   Who: healthy adults in creatine RCTs, with and without exercise training
   Effect: lean body mass without exercise MD 0.07 lb (95% CI -1.4 to 1.5; metric: 0.03 kg, -0.65 to 0.70); with resistance training MD 2.4 lb (1.2 to 3.6; metric: 1.10 kg, 0.56 to 1.65)
   Certainty: Fat mass not pooled in this review; shows that body-composition effects need training.
   Nutrition, 2022 · checked 2026-10-07 · we read the abstract
7. ev-crwl-07 · Randomized controlled trial(s) · randomized double-blind placebo-controlled trial; participants chose the exercise or non-exercise arm · n = 64
   Creatine supplementation during an exercise and weight-loss diet intervention increased lean tissue mass, promoted a greater reduction in body fat percentage, and improved muscular strength, endurance, and selected markers of cognitive function and memory.
   
   Who: 64 sedentary adults aged 45 to 65 (40 women), mean weight 186 lb (84.5 kg); 2 x 5 g/day creatine monohydrate or placebo
   Effect: greater reduction in body-fat percentage and higher lean tissue mass with creatine in the diet and exercise arm
   Certainty: Exercise arm was self-selected, only supplement was randomized; effect sizes not given in the abstract.
   J Int Soc Sports Nutr, 2026 · checked 2026-10-07 · we read the abstract
8. ev-crwl-08 · Observational data · controlled clinical trial · n = —
   CrS and P1 demonstrated similar decreases in body weight and percent body fat.
   
   Who: male resistance trainers on a formula diet of 18 calories/kg/day for 4 days; 20 g/day creatine or placebo
   Effect: similar falls in body weight and body fat; fat-free mass -1.4% with creatine vs -2.4% with placebo; nitrogen loss similar
   Certainty: Very short, small, 2001; randomization not stated in the abstract.
   Med Sci Sports Exerc, 2001 · checked 2026-10-07 · we read the abstract
9. ev-crwl-09 · Randomized controlled trial(s) · randomized controlled trial, no placebo · n = 63
   After the 7-day wash-in, the supplement group gained 0.51 ± 1.79 kg more lean body mass than the control group (p = 0.03).
   
   Who: 34 women and 29 men, mean age 31; 5 g/day creatine monohydrate or no supplement for 13 weeks
   Effect: lean body mass +1.1 lb (0.51 kg) vs control after 7 days; no between-group difference after 12 weeks of training
   Certainty: Control group received no placebo; DXA counts water as lean mass.
   Nutrients, 2025 · checked 2026-10-07 · we read the abstract
10. ev-crwl-10 · Position of an expert body · expert narrative review · n = —
    The initial loading phase of creatine supplementation (i.e. 20 g/day for 5-7 days) typically results in a 1-3 kg increase in body mass, mostly attributable to net body water retention [75, 76].
    
    Who: people starting creatine with a loading phase
    Effect: body mass +2.2 to 6.6 lb (1 to 3 kg) during loading, mostly body water
    Certainty: Narrative review by creatine researchers, some with industry links; longer studies show no lasting rise in total body water.
    Journal of the International Society of Sports Nutrition, 2021, Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show? · checked 2026-10-07 · we read the fulltext
11. ev-crwl-11 · Position of an expert body · expert narrative review · n = —
    In summary, creatine supplementation does not increase fat mass across a variety of populations.
    
    Who: young and older adults, athletes, postmenopausal women and patient groups in creatine trials
    Effect: no increase in fat mass
    Certainty: Expert opinion summarizing RCTs; does not claim creatine causes fat loss.
    Journal of the International Society of Sports Nutrition, 2021, Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show? · checked 2026-10-07 · we read the fulltext
12. ev-crwl-12 · Position of an expert body · society position stand · n = —
    The only consistently reported side effect from creatine supplementation that has been described in the literature has been weight gain [5, 22, 46, 78, 91, 92, 112].
    
    Who: healthy people and patient groups using creatine monohydrate
    Effect: weight gain is the only consistently reported side effect
    Certainty: Sports nutrition society with some industry ties among authors; does not cover pre-existing kidney disease.
    Journal of the International Society of Sports Nutrition, 2017, International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine · checked 2026-10-07 · we read the fulltext
13. ev-crwl-13 · Observational data · systematic review and meta-analysis of controlled studies · n = 440
    Creatine supplementation was associated with a small but statistically significant increase in serum creatinine (MD: 0.07 µmol/L; 95% CI: 0.01 to 0.12; p = 0.03).
    
    Who: studies of creatine supplementation reporting kidney outcomes; 177 creatine and 263 control participants in the creatinine analysis
    Effect: serum creatinine MD 0.07 (95% CI 0.01 to 0.12); rise significant only in the first week; no significant change in GFR
    Certainty: Mostly healthy people; a creatinine rise can be misread on a kidney blood test; no data on existing kidney disease.
    BMC Nephrol, 2025 · checked 2026-10-07 · we read the abstract