Creatine Monohydrate for Weight Loss Support

Creatine does not cause weight loss. In a 2024 meta-analysis of 143 randomised body-composition trials, creatine raised body mass by 0.86 kg (95% CI 0.76 to 0.96) and fat-free mass by 0.82 kg, and lowered body fat percentage by 0.28 points. The changes are small, and much of the early weight gain is water.

The fat-loss question is less settled. With weight training, two meta-analyses of 12 trials each in adults under 50 disagreed on absolute fat mass (-0.73 kg in one; -0.18 kg, not significant, in the other), and a 2026 analysis of 63 trials found no significant fat-mass change. The three small studies we found that tested creatine during a diet were mixed, so the answer for someone trying to lose weight is that creatine is an add-on for protecting training, not a weight-loss tool.

Creatine's most reliable effect on the scale is water. In 32 trained adults, 28 days of creatine (25 g a day for 7 days, then 5 g a day) raised muscle creatine, body mass and total body water, with no change in how that water was split between compartments. In 13 young soccer players, 7 days at 0.3 g/kg a day raised total body water by 2.3 L and body weight by 1.0 kg more than placebo.

That water also shows up in body-composition readings. In 27 young adults, one week of creatine raised fat-free mass by 1.1 kg on DXA and by 1.9 kg on a multi-frequency impedance scale, which also detected a 2% rise in total body water (40.4 to 41.2 kg). Early lean-mass gains on a body-composition scale therefore partly reflect water.

A 2019 review of adults 50 and over proposed that creatine metabolism plays a role in fat-tissue energy use and energy expenditure, but its own pooled result for fat mass was not significant (about 0.5 kg more lost, P = 0.13). In a crossover trial in 10 men, creatine raised carbohydrate oxidation by 8.9% and did not change fat mass, while fat mass fell by 2.4 kg on placebo; the authors suggested the shift in fuel use might inhibit fat loss.

In a 4-day energy-restriction study, creatine raised muscle creatine by 15-16% but did not affect body fat or protein loss. What the mechanisms cannot tell you is whether any of this produces fat loss in people. What creatine does reliably in the reviews is improve strength: in 63 trials, lifting plus creatine beat lifting alone for upper-body strength (g = 0.54) and lower-body strength (g = 0.55).

Nearly all trials (95% of 685 in one analysis) used creatine monohydrate, at an average of 0.166 g/kg a day (about 12.5 g a day) for about 65 days. Individual protocols varied widely: 20 g a day for 4 days then 2 g a day in one crossover trial, 5 g a day for 12 weeks in the hair-follicle trial, 10 g a day for 12 weeks in the diet-and-exercise trial, and loading of 20 to 25 g a day (or 0.3 g/kg a day) for 4 to 7 days. The 2024 meta-analysis of 143 trials found larger effects when a maintenance dose or resistance training was included, without giving a dose figure in its abstract.

An exploratory meta-regression in adults under 50 estimated that 7 g a day, or 0.3 g/kg a day (the source gives both, and they are different amounts), would add about 1 kg of lean mass and remove 0.7 kg of fat versus lifting alone. Nothing in the dosing data tests whether more creatine speeds up fat loss during a diet. The trial that combined creatine, exercise and a weight-loss diet used 10 g a day for 12 weeks.

Across all 143 trials in the 2024 GRADE-assessed meta-analysis, creatine raised body mass by 0.86 kg and fat-free mass by 0.82 kg and lowered body fat percentage by 0.28 points; the effects were small and stronger with resistance training. For adults under 50 doing resistance training, a 2024 meta-analysis of 12 trials found creatine added 1.14 kg of lean mass and removed 0.73 kg of fat mass (95% CI -1.34 to -0.11) and 0.88 points of body fat percentage versus lifting alone.

A 2023 meta-analysis of 12 trials (266 people) found a 1.19-point fall in body fat percentage (P = 0.006) but no difference in absolute fat mass (-0.18 kg, P = 0.76). A 2026 three-level meta-analysis of 63 trials (n = 1,489) found a small rise in body mass (g = 0.12), a small fall in body fat percentage (g = -0.14, P = 0.02) and no significant change in fat mass (g = -0.10, P = 0.14); the authors attributed the lower fat percentage to the lean-mass gain. The oldest review here, a 2003 meta-analysis of 100 studies, found a small effect on body mass and lean body mass (effect size 0.17).

In adults 50 and over, a 2019 meta-analysis of 19 studies (609 people) found body fat percentage fell 0.55 points more with creatine (P = 0.04); the roughly 0.5 kg extra fat loss was not significant (P = 0.13).

Three small studies tested creatine in a weight-loss setting. In the first, male resistance trainers ate a formula diet of 75.3 kJ (18 kcal) per kg a day for 4 days; creatine and placebo groups lost similar body weight and body fat percentage, fat-free mass fell 1.4% with creatine and 2.4% with placebo, and the authors concluded creatine did not affect body fat or protein loss. In a pilot of 15 women after bariatric surgery, 8 g of creatine before each strength session for 8 weeks matched placebo: body weight fell 9.5 versus 9.6 kg and fat mass 8.64 versus 8.88 kg.

The most favourable result comes from a 12-week trial in 64 adults aged 45 to 65 who took 10 g a day. In the group that chose an exercise and weight-loss diet programme, creatine increased lean tissue mass, promoted a greater reduction in body fat percentage and improved strength. Participants picked their arm before being randomised to creatine or placebo, and the abstract gives no effect sizes.

Almost all pooled data come from healthy people lifting weights without a calorie deficit, so they test body composition, not weight loss. None of the sources reviewed measured belly fat, long-term weight maintenance or weight regain. In the 2024 meta-analysis of 12 trials, 52% of studies had low risk of bias, 41% some concerns and 7% high risk.

The fat changes are fractions of a kilogram and depend on which review you read. Because creatine adds lean mass (and early water), body fat percentage can fall without a fall in fat mass; the 2026 authors attribute the drop to lean-mass gain.

Creatine has a strong safety record in healthy people. A 2017 International Society of Sports Nutrition position stand reported that supplementation up to 30 g a day for 5 years is safe and well tolerated in healthy individuals, although randomised kidney data beyond a year are still lacking. An analysis of 685 trials found side effects in 13.7% of creatine-group studies versus 13.2% of placebo-group studies (P = 0.776). Gastrointestinal complaints appeared in slightly more creatine studies (4.9% versus 4.3%) and muscle cramping or pain in 2.9% versus 0.9%, but not significantly more per participant.

The effect to know about is on kidney blood tests. A 2025 meta-analysis found a small but significant rise in serum creatinine at 1 week or less and again beyond 12 weeks, though not at 1 to 12 weeks, with no significant change in glomerular filtration rate; its authors read the rise as likely metabolic turnover rather than kidney impairment, which is an interpretation, not proof of no effect. A 2026 meta-analysis of 19 RCTs and one crossover study found serum creatinine rose by 0.13 mg/dL (95% CI 0.07 to 0.18) with no significant difference in urea or eGFR, but the eGFR estimate was imprecise (-5.20 mL/min/1.73 m2, 95% CI -15.00 to 4.60, 8 studies), and the authors said trials longer than one year are needed.

On hair loss, a 12-week trial in 45 men (38 completed) found no difference from placebo in DHT, the DHT-to-testosterone ratio or hair measures. An earlier crossover study in 20 rugby players found DHT up 56% after loading and 40% above baseline after maintenance, but it did not measure hair.

Using creatine during GLP-1 weight loss? Our GLP-1 supplement guide explains what the research does and does not show.

No drug interactions are well documented, and we found no formal drug-interaction studies. The Merck Manual notes doctors' concern that creatine may increase the risk from medicines that affect kidney function, such as nonsteroidal anti-inflammatory drugs (NSAIDs), and that caffeine may decrease creatine's benefit. The other practical conflict is with the lab tests used to monitor the kidneys.