Study analysis · European Review of Aging and Physical Activity · 2025
Creatine won't make your bones stronger—here's what it actually does for older adults.
Taking creatine with strength training helps older people lift about 2 kg more, but doesn't help them lose meaningful fat or strengthen bones.
Overview
What the study found
The study in plain English — the bottom line, every takeaway we extracted, and what to do with them.
In simple terms
This study looked at lots of different experiments where people took creatine and exercised, and then combined all the results to see what usually happened. It tells us that, on average, creatine and exercise together probably help older people get stronger, but it doesn't prove it for everyone — some studies were messy or didn't follow the rules well.
What’s the bottom line?
This study looked at whether taking creatine (a supplement) while doing strength exercises helps older people get stronger, lose fat, or improve bone health.
How strong is this study?
The study did a good job gathering all the right experiments and checking them carefully, but many of the original studies didn't do a great job hiding who got creatine or making sure people took it. That's like if some kids in a science fair didn't follow the recipe — so we can't be 100% sure the results are totally trustworthy.
40 / 100
- COI disclosure+40/40
- Data availabilitydata not shared
- Code availabilitycode not shared
44 / 100
- Randomizationrandomization unclear
- Blindingblinding unclear
- Control group+15/15
- Sample size (n=1093)+19.9/20
- Follow-upno follow-up reported
100 / 100
100 / 100
- P-values+15/15
- Effect size+20/20
- Confidence intervals+15/15
- Pre-registration+15/15
Each component is scored out of 100 and then capped by the study design — a case series cannot reach the ceiling a randomised trial can, however well it is reported.
Where it sits
RCT reviewsReviews of RCTs (Meta-analyses)
Max 100Randomized TrialsRandomized Trials
Max 90Reviews of Cohort StudiesReviews of Cohort Studies
Max 85Cohort StudiesCohort Studies
Max 72Reviews of Case-Control StudiesReviews of Case-Control Studies
Max 63Case-Control StudiesCase-Control Studies
Max 58Cross-Sectional & Case SeriesCross-Sectional & Case Series
Max 50Expert OpinionExpert Opinion
Max 568 / 100
Probability of being correct
The highest quality evidence. Systematic reviews and meta-analyses that pool randomized controlled trials, giving the most reliable summary of experimental evidence.
This design can establish causation. This study is a systematic review and meta-analysis of RCTs, which can establish causation because the included studies used randomization and control groups. However, the overall causation strength is limited by methodological weaknesses in some included RCTs, such as unclear randomization, high risk of bias due to adherence and dropout issues, and lack of blinding in some studies.
No Conflicts
No conflicts of interest identified
No conflicts of interest or funding disclosures were reported in the text; study appears independently conducted with no apparent industry ties.
Independent Analysis Safeguards
- Protocol registered with PROSPERO (CRD42024581817)
- PRISMA guidelines followed
- Two independent reviewers for screening, quality assessment, and data extraction
- Cochrane RoB 2 and PEDro scales used for bias and quality assessment
- Sensitivity analysis and publication bias tests (Begg and Egger) conducted
Although no funding or conflict of interest statements were disclosed, the study employed rigorous methodological safeguards including PROSPERO registration, dual-reviewer processes, and standardized bias assessment tools, which reduce the risk of bias. The absence of funding disclosure is a limitation but does not, by itself, indicate conflict.
Key takeaways
- 01
People who took creatine and did strength training got 2.12 kg stronger in one-rep lifts.
- 02
They lost 0.55% body fat on average—but that only happened because of one big study.
- 03
Their bone density didn't change at all.
- 04
Getting 2 kg stronger is meaningful for daily tasks like standing up or climbing stairs.
- 05
Losing half a percent of fat is too small to matter for health.
- 06
Bones didn't get stronger.
Surprising findings
- The body fat reduction effect disappeared when one study was removedMost people assume creatine helps with fat loss because it boosts metabolism—but this meta-analysis reveals the entire effect hinges on a single high-weight study, suggesting it's an artifact, not a real trend.
- 11 out of 20 studies had high risk of bias due to poor adherence reportingDespite being a high-profile meta-analysis, over half the included trials didn't properly track whether participants actually took their supplements—undermining confidence in all results.
Practical takeaways
Older adults should consider creatine (5g/day) combined with resistance training to gain measurable strength—about 2 kg more in 1RM lifts.
Don't expect fat loss or bone strengthening; results are only reliable for muscle strength, and adherence to supplements is often poorly reported in studies.
high confidenceIf you're taking creatine for fat loss, stop—it's not supported by robust evidence in older adults.
The 0.55% fat loss was entirely dependent on one study; removing it nullifies the effect.
low confidenceDon't rely on creatine for bone health—focus on weight-bearing exercise and vitamin D instead.
No effect on BMD was found, even with combined exercise and supplementation.
high confidenceWhy this study matters
2.12 kg strength boost is real
Creatine plus resistance training increased one-repetition maximum (1RM) strength by 2.12 kg (P=0.001) in adults over 55, with no heterogeneity across studies (I²=0%). This is equivalent to being able to lift a full grocery bag or a toddler with noticeably more ease.
For older adults, gaining even 2 kg of strength can mean the difference between standing up from a chair unassisted or needing help—directly impacting independence and fall risk.
Fat loss? Only because of one study
The reported 0.55% body fat reduction vanished when the Eijnde et al. (2003) study—responsible for 30% of the weight in the analysis—was removed, leaving no statistically significant effect (P=0.393).
Many supplement ads claim creatine burns fat—but this study shows that claim relies on a single outlier, making it unreliable for real-world advice.
Bones didn't budge—despite the hype
Despite clinical interest in creatine for osteoporosis, the study found zero meaningful change in bone mineral density (mean difference: 0.009 g/cm², P=0.557).
People assume supplements that help muscles also help bones—but this study shows creatine doesn't translate to bone health, challenging a common assumption.
Want the whole report?
Detailed mode opens the full scientific breakdown — every score component, the methodology, conflicts of interest, the evidence analysis behind each claim, and the raw study data.
Overview
What the study found
The study in plain English — the bottom line, every takeaway we extracted, and what to do with them.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
This study looked at whether taking creatine (a supplement) while doing strength exercises helps older people get stronger, lose fat, or improve bone health.
Research results
People who took creatine and did strength training got 2.12 kg stronger in one-rep lifts. They lost 0.55% body fat on average—but that only happened because of one big study. Their bone density didn't change at all.
What this means - more context
Getting 2 kg stronger is meaningful for daily tasks like standing up or climbing stairs. Losing half a percent of fat is too small to matter for health. Bones didn't get stronger.
This meta-analysis assesses the effects of creatine supplementation combined with exercise training on physical function and body composition in adults aged 55+.
Creatine plus resistance training significantly improves 1RM strength by 2.12 kg and reduces body fat by 0.55% in older adults, but the fat loss effect is not robust when one high-weight study is excluded. No significant effect was found on bone mineral density. Methodological quality of included RCTs is moderate, with 11 of 20 studies rated as high risk of bias due to poor adherence reporting and high dropout rates.
Methods Used
Systematic review and meta-analysis of 20 randomized controlled trials (n=1093 participants, 69% female) aged 55+, using PRISMA guidelines and PROSPERO registration (CRD42024581817). Outcomes: 1RM, body fat %, BMD. PEDro scale and Cochrane RoB 2 tool used for bias assessment.
Main Finding
Creatine plus exercise significantly increases 1RM strength by 2.12 kg (P=0.001) and reduces body fat by 0.55% (P=0.026), but the fat loss effect disappears when the Eijnde et al. (2003) study is excluded. No significant effect on BMD (mean difference 0.009 g/cm², P=0.557).
Confidence Level
Moderate. Findings for 1RM are robust and consistent; body fat reduction is sensitive to one high-weight study; BMD finding is stable but clinically insignificant. Overall confidence limited by high risk of bias in 11/20 included RCTs due to poor adherence reporting and high dropout rates.
Study Flags
Red Flags
- •11 of 20 included RCTs had high risk of bias due to poor adherence reporting
- •Body fat reduction effect disappeared when one high-weight study was removed
- •No significant effect on bone mineral density despite clinical interest
Surprising Findings
The body fat reduction effect disappeared when one study was removed
Most people assume creatine helps with fat loss because it boosts metabolism—but this meta-analysis reveals the entire effect hinges on a single high-weight study, suggesting it's an artifact, not a real trend.
Practical Takeaways
Older adults should consider creatine (5g/day) combined with resistance training to gain measurable strength—about 2 kg more in 1RM lifts.
RCT reviewsReviews of RCTs (Meta-analyses)
Max 100Randomized TrialsRandomized Trials
Max 90Reviews of Cohort StudiesReviews of Cohort Studies
Max 85Cohort StudiesCohort Studies
Max 72Reviews of Case-Control StudiesReviews of Case-Control Studies
Max 63Case-Control StudiesCase-Control Studies
Max 58Cross-Sectional & Case SeriesCross-Sectional & Case Series
Max 50Expert OpinionExpert Opinion
Max 568 / 100
Probability of being correct
The highest quality evidence. Systematic reviews and meta-analyses that pool randomized controlled trials, giving the most reliable summary of experimental evidence.
Human Meta-Analysis
Subject
Moderate probability
on the GRADE evidence scale
This study looked at lots of different experiments where people took creatine and exercised, and then combined all the results to see what usually happened. It tells us that, on average, creatine and exercise together probably help older people get stronger, but it doesn't prove it for everyone — some studies were messy or didn't follow the rules well.
No conflicts of interest were detected in this study. No score impact.
Strengths
- Followed PRISMA guidelines and was prospectively registered (PROSPERO)
- Used multiple databases and manual reference screening to reduce selection bias
- Included a large total sample size (1093 participants)
Weaknesses
- Randomization and blinding were 'unknown' in included RCTs, and 11 studies had high risk of bias per RoB 2
- Six studies had high risk of bias due to poor adherence reporting
- Five studies had some concerns due to unclear prespecified analysis plans
Methodology
Evidence Keywords
Statistical Reporting
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
This study looked at whether taking creatine (a supplement) while doing strength exercises helps older people get stronger, lose fat, or improve bone health.
Research results
People who took creatine and did strength training got 2.12 kg stronger in one-rep lifts. They lost 0.55% body fat on average—but that only happened because of one big study. Their bone density didn't change at all.
What this means - more context
Getting 2 kg stronger is meaningful for daily tasks like standing up or climbing stairs. Losing half a percent of fat is too small to matter for health. Bones didn't get stronger.
This meta-analysis assesses the effects of creatine supplementation combined with exercise training on physical function and body composition in adults aged 55+.
Creatine plus resistance training significantly improves 1RM strength by 2.12 kg and reduces body fat by 0.55% in older adults, but the fat loss effect is not robust when one high-weight study is excluded. No significant effect was found on bone mineral density. Methodological quality of included RCTs is moderate, with 11 of 20 studies rated as high risk of bias due to poor adherence reporting and high dropout rates.
Methods Used
Systematic review and meta-analysis of 20 randomized controlled trials (n=1093 participants, 69% female) aged 55+, using PRISMA guidelines and PROSPERO registration (CRD42024581817). Outcomes: 1RM, body fat %, BMD. PEDro scale and Cochrane RoB 2 tool used for bias assessment.
Main Finding
Creatine plus exercise significantly increases 1RM strength by 2.12 kg (P=0.001) and reduces body fat by 0.55% (P=0.026), but the fat loss effect disappears when the Eijnde et al. (2003) study is excluded. No significant effect on BMD (mean difference 0.009 g/cm², P=0.557).
Confidence Level
Moderate. Findings for 1RM are robust and consistent; body fat reduction is sensitive to one high-weight study; BMD finding is stable but clinically insignificant. Overall confidence limited by high risk of bias in 11/20 included RCTs due to poor adherence reporting and high dropout rates.
Study Flags
Red Flags
- •11 of 20 included RCTs had high risk of bias due to poor adherence reporting
- •Body fat reduction effect disappeared when one high-weight study was removed
- •No significant effect on bone mineral density despite clinical interest
Surprising Findings
The body fat reduction effect disappeared when one study was removed
Most people assume creatine helps with fat loss because it boosts metabolism—but this meta-analysis reveals the entire effect hinges on a single high-weight study, suggesting it's an artifact, not a real trend.
Practical Takeaways
Older adults should consider creatine (5g/day) combined with resistance training to gain measurable strength—about 2 kg more in 1RM lifts.
RCT reviewsReviews of RCTs (Meta-analyses)
Max 100Randomized TrialsRandomized Trials
Max 90Reviews of Cohort StudiesReviews of Cohort Studies
Max 85Cohort StudiesCohort Studies
Max 72Reviews of Case-Control StudiesReviews of Case-Control Studies
Max 63Case-Control StudiesCase-Control Studies
Max 58Cross-Sectional & Case SeriesCross-Sectional & Case Series
Max 50Expert OpinionExpert Opinion
Max 568 / 100
Probability of being correct
The highest quality evidence. Systematic reviews and meta-analyses that pool randomized controlled trials, giving the most reliable summary of experimental evidence.
Human Meta-Analysis
Subject
Moderate probability
on the GRADE evidence scale
This study looked at lots of different experiments where people took creatine and exercised, and then combined all the results to see what usually happened. It tells us that, on average, creatine and exercise together probably help older people get stronger, but it doesn't prove it for everyone — some studies were messy or didn't follow the rules well.
No conflicts of interest were detected in this study. No score impact.
Strengths
- Followed PRISMA guidelines and was prospectively registered (PROSPERO)
- Used multiple databases and manual reference screening to reduce selection bias
- Included a large total sample size (1093 participants)
Weaknesses
- Randomization and blinding were 'unknown' in included RCTs, and 11 studies had high risk of bias per RoB 2
- Six studies had high risk of bias due to poor adherence reporting
- Five studies had some concerns due to unclear prespecified analysis plans
Methodology
Evidence Keywords
Statistical Reporting
Scoring
How strong is this study?
The study did a good job gathering all the right experiments and checking them carefully, but many of the original studies didn't do a great job hiding who got creatine or making sure people took it. That's like if some kids in a science fair didn't follow the recipe — so we can't be 100% sure the results are totally trustworthy.
40 / 100
- COI disclosure+40/40
- Data availabilitydata not shared
- Code availabilitycode not shared
44 / 100
- Randomizationrandomization unclear
- Blindingblinding unclear
- Control group+15/15
- Sample size (n=1093)+19.9/20
- Follow-upno follow-up reported
100 / 100
100 / 100
- P-values+15/15
- Effect size+20/20
- Confidence intervals+15/15
- Pre-registration+15/15
Each component is scored out of 100 and then capped by the study design — a case series cannot reach the ceiling a randomised trial can, however well it is reported.
Where it sits
RCT reviewsReviews of RCTs (Meta-analyses)
Max 100Randomized TrialsRandomized Trials
Max 90Reviews of Cohort StudiesReviews of Cohort Studies
Max 85Cohort StudiesCohort Studies
Max 72Reviews of Case-Control StudiesReviews of Case-Control Studies
Max 63Case-Control StudiesCase-Control Studies
Max 58Cross-Sectional & Case SeriesCross-Sectional & Case Series
Max 50Expert OpinionExpert Opinion
Max 568 / 100
Probability of being correct
The highest quality evidence. Systematic reviews and meta-analyses that pool randomized controlled trials, giving the most reliable summary of experimental evidence.
This design can establish causation. This study is a systematic review and meta-analysis of RCTs, which can establish causation because the included studies used randomization and control groups. However, the overall causation strength is limited by methodological weaknesses in some included RCTs, such as unclear randomization, high risk of bias due to adherence and dropout issues, and lack of blinding in some studies.
No Conflicts
No conflicts of interest identified
No conflicts of interest or funding disclosures were reported in the text; study appears independently conducted with no apparent industry ties.
Independent Analysis Safeguards
- Protocol registered with PROSPERO (CRD42024581817)
- PRISMA guidelines followed
- Two independent reviewers for screening, quality assessment, and data extraction
- Cochrane RoB 2 and PEDro scales used for bias and quality assessment
- Sensitivity analysis and publication bias tests (Begg and Egger) conducted
Although no funding or conflict of interest statements were disclosed, the study employed rigorous methodological safeguards including PROSPERO registration, dual-reviewer processes, and standardized bias assessment tools, which reduce the risk of bias. The absence of funding disclosure is a limitation but does not, by itself, indicate conflict.
Standing
The people behind it
The researchers who wrote the study this analysis is built on.
Authored by
4 researchersIf this is your work, this is how we attribute it on Fit Body Science. Ghazal Sharifian is listed as the lead author.