The creatine evidence base does not look like the creatine label. 1,093 people across twenty trials. 69% women. Ages 55 to 84.
The person least likely to reach for that jar, the person who walks past it every time between the fish oil and the multivitamins, is the person the research was built on.
The creatine evidence base does not look like the creatine label.
Sharifian and colleagues published a meta-analysis in the European Review of Aging and Physical Activity in 2025, pooling data from twenty randomized controlled trials on creatine combined with exercise in older adults. 1,093 participants across eight countries. 69% were women. Average age range: 55 to 84.
The faces on every creatine container in every supplement store are young men mid-lift. The faces in the evidence are their mothers and grandmothers.
The person least likely to reach for that jar, the person who walks past it every time between the fish oil and the multivitamins, is the person the research was built on.
Creatine combined with exercise didn't improve everything. It improved the muscles aging damages most. Its long-term safety in older adults, the authors write, still needs more research.
- Adding creatine to an exercise routine made older adults measurably stronger across twenty independent studies, with perfect agreement between them.
- The strength benefit landed specifically in legs and back, the muscles aging degrades fastest, while arms and chest showed no significant improvement.
- This review did not pool kidney or liver outcomes; its authors note that in earlier trials no adverse kidney and liver function events were associated with the creatine doses those trials used, and they call for longitudinal studies of long-term use in older adults.
- The body fat finding looked promising until researchers removed one influential study, and the entire result disappeared.
- The largest study specifically testing frail older adults (200 people) found no creatine benefit, limiting the positive evidence to healthy, active adults who exercise.
What Twenty Studies Found
The meta-analysis tested whether adding creatine to a resistance training program improved strength compared to training alone.
It did. An additional 2.122 kilograms on the maximum-effort strength test — the heaviest single lift a person can perform. That is the combined signal from twenty independent trials. The measure of disagreement between studies — on a scale from zero for perfect agreement to one hundred for total contradiction — came back at exactly zero.
Twenty studies. Same direction. No outliers. No contradictions.
That kind of consistency is unusual in exercise science. Most meta-analyses show at least moderate disagreement between studies. This one showed none. Whatever creatine combined with exercise does for older adults' strength, it does it reliably.
Where the Strength Landed
Not everywhere.
The meta-analysis broke the results down by exercise type, and the pattern was specific. Leg press strength improved significantly. Lat pull-down improved.
Both cleared the statistical threshold for a real effect. Both target the lower body and upper back, the largest muscle groups that carry the load during daily movement.
Arm curl did not reach significance. Bench press did not. Chest press did not.
Creatine did not make everything stronger. It made legs and back stronger. Arms and chest barely responded.
The paper's authors offered a direct explanation: lower-body muscles lose mass, power, and strength more markedly with age than upper-body muscles. The muscles that aging degrades fastest are the same muscles creatine improved most.
That is not a coincidence dressed up as a finding. It is the biological logic of the supplement intersecting with the biological logic of aging. For anyone whose primary concern about getting older is legs (stairs, chairs, the confidence to cross a parking lot at a normal pace), the selectivity is not a limitation. It is precision.
- Leg Press
- Lat Pull-Down
- Arm Curl
- Bench Press
- Chest Press
Creatine did not make everything stronger. It made legs and back stronger. Arms and chest barely responded.
What the Paper Says About Kidneys and Liver
The meta-analysis pooled three outcomes across its trials: maximal strength, bone mineral density and body fat percentage. What it says about kidneys and liver comes from its discussion of earlier trials in older adults, not from a tally across its twenty trials.
"In previous studies, no adverse kidney and liver function events have been associated with these dose regimens," the authors write. The regimens are a loading phase of 20 grams a day for five to seven days and then 5 to 7 grams daily, or 5 to 7 grams daily (or 0.1 grams per kilogram of body weight). In the studies the authors cite, no serious adverse effects were noted for up to two years.
Gastrointestinal complaints were reported with both regimens, especially during the loading phase, and they lowered how consistently people took the supplement.
The authors write that more research is necessary to assess creatine's long-term safety in older populations. They call for longitudinal studies of the adverse effects of long-term use, "particularly since this population exhibits decreased kidney and liver function compared to young, healthy individuals."
What the Evidence Does Not Support
The strength finding is solid. The body fat finding is not.
The meta-analysis reported a reduction in body fat: a reduction of just over half a percentage point — initially clearing the significance threshold. That initially looks like creatine also helps older adults lose fat.
Then the researchers tested whether the result held up. They removed one study (Eijnde et al., 2003) that was pulling the average. The entire finding fell apart. Without that single study, the fat-loss result was no longer meaningful.
The authors' own assessment: insufficient evidence to support a definitive conclusion about creatine and body fat in older adults.
The strength data does not depend on any single study. Twenty trials agree. The fat-loss claim leans on one. Knowing which findings hold up under scrutiny and which do not is what makes evidence useful instead of decorative.
The quality picture adds context. The studies scored well on one quality scale, averaging nearly 8 out of 10. When assessed using a stricter tool designed to catch subtler design flaws, 11 of the 20 studies were rated high risk of bias.
Keeping participants unaware of whether they received creatine or a placebo is genuinely difficult — the supplement involves a noticeable first-week routine that a sugar pill does not. The strength finding survives this concern because twenty studies showing the same direction compensates for imperfect individual quality. But the evidence is imperfect, even when the direction is clear.
Finding still holds.
Finding disappears.
The strength data does not depend on any single study. Twenty trials agree. The fat-loss claim leans on one.
Who This Evidence Is For
The largest single study in this meta-analysis was Roschel and colleagues' 2021 trial: 200 pre-frail and frail elderly adults. Creatine combined with exercise did not produce a significant strength benefit in that population.
Chilibeck and colleagues' two-year trial in postmenopausal women found a similar pattern: no strength advantage from creatine supplementation.
These are not contradictions. They are boundaries. The meta-analysis included both healthy and frail older adults, and the overall benefit is driven by the healthy, active participants who exercised regularly.
If you are 55 to 70, healthy, and training or planning to start, you are the population this evidence describes. The strength benefit is real. The consistency is rare.
If you are frail or pre-frail, the evidence does not support the same conclusion. The largest study specifically testing that population found no effect.
The edges of the evidence are not weaknesses. They are what make the positive findings trustworthy. An evidence base that claims to work for everyone usually works for no one in particular.
What Comes Next
Creatine works primarily through the energy system. The proposed mechanism is that creatine restores phosphocreatine stores in muscle cells, providing a buffer that allows faster recovery between high-effort contractions. It does not build muscle directly. It lets the training stimulus hit harder.
That means creatine's benefit is only as good as the exercise program it supports. The supplement enhances the stimulus. The stimulus builds the muscle.
A previous meta-analysis by Chilibeck and colleagues found that creatine supplementation with resistance training increased lean tissue mass by approximately 1.37 kilograms in older adults, providing independent corroboration that the combination produces measurable gains beyond strength alone.
If creatine works because it amplifies what exercise does, the next question the evidence opens is practical: what kind of training gives older adults the most return? That question has its own evidence base, its own surprises, and its own prescription. The supplement question is answered. The training question is next.
The next time you pass the creatine section, the question is different. Not whether the research applies to your age group — twenty studies confirmed it does. Kidney and liver safety is not what this review measured; its authors call for longitudinal studies of long-term use in older adults. The question is whether your training program gives creatine something to amplify.
This study found that creatine works through exercise, not instead of it. The benefit appeared in people who trained and disappeared in those who were frail or inactive. The supplement is only as useful as the stimulus it supports.
For healthy adults between 55 and 70 who already exercise or plan to start, the evidence answered the creatine question with unusual consistency. What it opened is the training question: if creatine enhances what exercise does, the quality of the exercise program matters as much as the supplement.
What this means for you
This is the population the meta-analysis describes most directly. The strength benefit found across twenty studies represents what creatine adds on top of what exercise alone delivers — not a replacement for training.
The trials used different doses. Some began with a higher amount for the first five to seven days and then dropped to a lower dose; others used the same dose throughout. In earlier trials the authors cite, both approaches improved strength with training. Gastrointestinal complaints were reported with both, especially during the loading phase.
This review could not compare doses, and its authors write that further studies are required to establish the appropriate dosing for older adults.
More than two-thirds of the participants across these twenty studies were women. That is unusual for creatine research, which historically focused on younger male populations.
The overall strength finding includes this majority-female evidence base, and the consistency across studies held. But one specific two-year trial in postmenopausal women found no strength advantage from creatine, despite the longer duration giving the supplement more time to work.
The picture for women is not uniformly positive. It is unusually well-represented and mostly encouraging, with one long-term result that did not follow the pattern.
The largest single study in this meta-analysis, with 200 participants who were pre-frail or frail, found no additional strength benefit from adding creatine to exercise.
A separate long-term trial arrived at a similar conclusion for a related population. The overall positive result in the meta-analysis is driven by healthier, more active participants. The frail population had a different outcome entirely.
If a healthcare provider has described your situation as frail or pre-frail, the research tested that population specifically and found no additional benefit. The positive conclusion applies to healthier, active older adults.
Before you change anything
Tested: adults 55 to 84, mixed health, exercising regularly. The twenty studies included healthy older adults, postmenopausal women, and people with conditions like Parkinson's disease and COPD. The overall strength finding draws from all of them, but the positive result is driven primarily by healthier, active participants.
Not tested: adults under 55, people not exercising. Age 55 was the cutoff by design. The paper explicitly states that creatine without exercise did not improve strength, physical performance, or overall health in this population. The supplement enhances training. Without training, it showed no benefit.
Mixed results in frail populations. Two studies specifically testing frail or pre-frail older adults found no creatine advantage. The evidence supports healthy aging adults who exercise, not older adults broadly.
Only three research databases were searched. The meta-analysis drew from PubMed, Scopus, and Web of Science. Other databases and unpublished research were not included, which means relevant studies may have been missed.
Populations with different conditions were pooled together. Healthy older adults, people with Parkinson's disease, COPD patients, and frail elderly were all analyzed as one group. The researchers could not separate the results by condition because too few studies existed in each category.
No dose comparison was possible. Creatine doses differed from trial to trial, some with a loading phase and some without, and with only one or two studies for each dose, the review could not analyse them separately. Study durations ranged from 7 to 104 weeks with no duration-specific analysis.
The strength finding sits on solid ground. Twenty studies pointed in the same direction with zero disagreement between them. That consistency is rare in exercise science and compensates for the fact that many individual studies had design limitations. When twenty research teams in eight countries arrive at the same answer independently, the signal is durable.
The body fat claim does not hold the same weight. One study carried the statistical result. Remove it and the finding disappears. The researchers themselves called the evidence insufficient for a definitive conclusion.
Bone density showed no effect. Creatine combined with exercise did not meaningfully change bone mineral density in this population. That is not a failure of the evidence — it is a clean null result, possibly limited by study durations too short to detect bone changes.
Creatine answered the supplement question for legs. But the supplement works by making each training session hit harder, which means the training itself decides how much benefit arrives.
For adults diagnosed with age-related muscle loss, the training question has been tested directly. Twenty-four trials in 951 adults with sarcopenia led the authors to suggest a starting dose — and grip strength, a test used to diagnose the condition, showed limited response to training, so they proposed leg-strength and walking tests as better markers of it.
What This Study Found
All findings from this paper, in plain language.
- Older adults who added creatine to their exercise routine got measurably stronger than those who exercised without it, across all twenty studies.
- The strength improvement showed up in legs and back but not arms or chest, targeting the muscles aging affects most.
- Creatine combined with exercise did not improve bone density in the older adults studied.
- A small body fat reduction appeared at first, but the result depended entirely on one study and disappeared when it was removed.
- The twenty studies agreed perfectly on the strength result, with no disagreement between independent research teams.
- The muscles that benefited most from creatine are the same muscles that lose strength fastest with age, according to the researchers.
- Study quality was generally good on one scale, but more than half scored high risk on a stricter quality tool.
- This review did not measure kidney or liver safety itself; its authors note that in earlier trials no adverse kidney and liver function events were associated with the creatine doses those trials used.
- In earlier trials the authors cite, two dosing approaches both improved strength with training: a higher amount for the first five to seven days, or one daily dose from the start; this review did not compare them.
- Creatine appears to work by restoring an energy compound in muscles that lets each exercise repetition hit harder.
- A previous large analysis found that creatine combined with exercise produced measurable gains in lean tissue in older adults, supporting the current results.
- The largest single study, testing 200 frail older adults specifically, found no benefit from adding creatine to their exercise program.