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Research summary

Creatine and Muscle Growth

Key takeaway

Creatine added to resistance training produced about 1.1 kg more lean body mass than training alone in the meta-analyses summarized here. In the 2022 review, the no-exercise subgroup did not show a statistically significant lean-mass difference. These are group averages from the included trials, not predictions for an individual or proof that creatine has no effect without exercise. Lean body mass does not distinguish contractile muscle from water and other non-fat components.[1], [2]

Evidence limitations

The roughly 1.1 kg estimate describes creatine added to resistance training in the included trials. The 2022 review reported high heterogeneity across studies, and its no-exercise subgroup did not show a statistically significant difference. The pooled estimates do not establish a minimum effective dose, a personal result or the amount of new contractile muscle.[1], [2]

Subgroup results, such as the larger response reported in males than females, come from a single meta-analysis and should be interpreted cautiously given the between-study variability and the differing number of trials available per subgroup.[2]

What the meta-analyses report

A 2024 meta-analysis of 12 studies in adults under 50 reported 1.14 kg more lean body mass with creatine plus resistance training than with training alone (95% CI 0.69 to 1.59). A separate 2022 review included 35 randomized trials and 1,192 participants overall; its resistance-training subgroup reported 1.10 kg more lean body mass (95% CI 0.56 to 1.65). The review-wide study and participant totals should not be read as that subgroup's sample size.[1], [2]

In the 2022 meta-analysis, creatine without exercise did not produce a statistically significant lean-body-mass difference from control, and the mixed-exercise estimate was also not statistically significant. These findings describe the included trials; they do not establish that creatine can never affect lean mass without training or identify a personal dose.[2]

Who responds and by how much

The average effect should not be read as identical for everyone. The 2022 meta-analysis reported a statistically significant lean body mass gain in males of about 1.46 kg, while the corresponding estimate in females of about 0.29 kg was not statistically significant. Whether this reflects a genuinely smaller response in females or simply fewer and smaller trials in that subgroup is not resolved by the data, so the subgroup findings are best treated as preliminary signals rather than firm conclusions.[2]

References

  1. 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. Systematic review and meta-analysis View source →
  2. Influence of age, sex, and type of exercise on the efficacy of creatine supplementation on lean body mass: A systematic review and meta-analysis of randomized clinical trials.. Nutrition (Burbank, Los Angeles County, Calif.). 2022. Systematic review and meta-analysis View source →

Read the concise FAQ answer

Use the FAQ when you want the direct answer first, then return here for the full evidence context.

Does creatine help build muscle and strength?

Creatine can add a modest increase in lean body mass when combined with resistance training. It is also associated with improvements in muscle strength, power and other short-duration high-intensity performance. The meta-analyses summarized here report roughly 1.1 kg of additional lean mass versus training alone; the no-exercise subgroup in the 2022 review did not show a statistically significant lean-mass difference.

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