Creatine and longevity: what the trials in older adults actually show

Creatina y longevidad: lo que muestran los ensayos en personas mayores

Illustrative image. Does not represent guaranteed results.

What creatine is and why you already have it

Here is something your body does well that almost nobody tells you: it makes its own creatine, every day, and has been doing it since long before you knew the word.

Your liver, pancreas and kidneys build it from three amino acids you already eat. You store it mostly in muscle — about 95% of the total — with the rest spread through other tissues, including the brain. A 70-kilo adult is carrying around 120 grams of it.

What is it doing there? Covering the first few seconds of any hard effort. Standing up from a low chair. Taking stairs two at a time. Holding a heavy bag while you find your keys. Creatine recharges the muscle's energy currency in exactly that short, demanding window.

And that is where aging comes in. What you lose over the years is not the ability to walk for half an hour — it is power, the quick push. It goes first, and you feel its absence most.

The best-documented part: muscle

This is the solid ground, and it deserves actual numbers.

In 2017 a Canadian team pooled 22 randomized trials with 721 participants, men and women, with study mean ages between 57 and 70. Everyone was doing resistance training. Half took creatine, half took placebo.

Comparing the two groups:

A kilo and a half of lean mass is not a headline. But turn it around: after 50, the default is losing muscle year after year. A kilo and change in the other direction, in controlled trials, is one of the most consistent findings in the entire supplement field.

The newest meta-analysis tempers the number

If the article stopped there, you would have half the story.

In December 2025 a narrower analysis was published: 8 trials, 482 people, untrained older adults and postmenopausal women. The effects came out smaller:

• Lower-limb strength: SMD 0.29 (95% CI 0.00–0.57), p=0.05 — right on the line.
• Lean tissue mass: SMD 0.27 (95% CI 0.02–0.53), p=0.03.
• Upper-limb strength: SMD 0.25 (95% CI −0.03–0.54), p=0.08 — not significant.

Which one is right? Probably both. The 2017 analysis pools more trials and more people; the 2025 one is more selective and therefore has less statistical power. The honest reading is neither "it works wonders" nor "it does nothing": the effect is real, it is modest, and it is firmer in the legs and in lean mass than in the arms.

That is the sentence worth keeping. Not the headline.

The fine print: it was never tested alone

This is the part left out of every sales pitch, and it is the part that decides whether creatine is worth anything to you.

In those meta-analyses, both groups were doing resistance training. Creatine was not compared against doing nothing — it was compared against placebo on top of training. The 2025 analysis says so outright: it only included trials where creatine came with resistance training.

Put plainly: creatine is not the treatment. The training is the treatment. Creatine is what makes that training pay a little better.

Buy it and skip the training, and you have bought the side dish without the meal.

The brain: what was actually measured

This is where the internet ran ahead of the data, and where we would rather tell you what is there.

In February 2026, Nutrition Reviews published a systematic review of creatine and cognition in adults aged 55 and older. It found six studies, 1,542 participants. Five of the six reported something positive, mostly in memory and attention.

Now look at what those five are made of:

• Four were cross-sectional, estimating creatine from what people recalled eating. That design shows association, not cause — and people who eat more meat and fish tend to differ in many other ways.
• The single randomized trial found no cognitive effect.
• No study using the Mini Mental State Examination found a difference.
• The authors themselves rate the evidence as low quality: of six studies, one good, two fair, three poor. Heterogeneity stopped them from running a meta-analysis at all.

The honest conclusion: for muscle there are trials; for memory there are not yet. There may be one day. There are not today, and anyone promising creatine will clear your head is promising more than the evidence holds.

Kidneys, hair and cramps

Three fears that have been repeating for thirty years. The most cited review on the subject, signed by eleven researchers in the field, takes them one at a time.

Kidneys

In healthy people at recommended doses, the conclusion is that it does not cause kidney damage or renal dysfunction. One detail confuses a lot of people and is worth understanding: creatine breaks down into creatinine, which is exactly the value your physician uses to estimate kidney function. If you take creatine, that number can rise without anything having changed in your kidneys. It is not damage — it is more raw material entering the system. Tell your physician before the lab draw, not after.

Hair

The whole fear traces to a single 2009 study that saw DHT rise. The creatine group started from a lower baseline DHT, the change stayed within the normal clinical range, and total testosterone did not move. In twelve other studies that measured it, it did not either. No human study has reported hair loss.

Cramps and dehydration

The review concludes it causes neither. In a controlled study of college football players, those taking creatine reported fewer cramps and fewer episodes of dehydration and heat illness than those who were not.

What can happen, mostly in the first days and with large doses at once: water retention and digestive discomfort. Lowering and splitting the dose settles it.

The dose the studies used

No mystery, and nothing sophisticated required.

• 3 to 5 g a day (roughly 0.1 g per kilo of body weight) is the maintenance dose that was studied.
• Held for at least four weeks to reach muscle saturation comparable to a fast load.
• A loading phase is not required. Loading (20 to 25 g a day split up, for 5 to 7 days) saturates faster and makes sense on a short deadline. The trade-off is digestive discomfort above 10 g in one serving.
• The form tested to exhaustion is monohydrate. The "enhanced" versions that cost triple do not have anything like that trial record behind them.

If you are on a GLP-1

There is a specific reason this article sits in this guide and not on a gym blog.

When you lose weight quickly, part of what leaves is muscle. That is not unique to GLP-1s — it happens with any marked weight loss — but it is the concern clinicians raise most when someone loses a lot in a short time.

What has evidence behind it for protecting muscle while you lose weight is a package, not a pill: enough protein, resistance training, and — as a companion with trials behind it in older adults — creatine. We have guides on the first two pieces: protein and muscle while losing weight and strength training on a GLP-1.

If you are already in a program, this is exactly the kind of thing worth raising with your provider at a check-in.

So your expectations are the right ones

Three things, without drama:

One. The effect on lean mass and strength is real and measurable, but it is modest. We are talking about roughly a kilo of lean mass across months of training, not a transformation.

Two. Outside of muscle the ground is far less firm. Cognition does not yet have trials supporting it in older adults.

Three. None of it works without the part you already knew. Creatine accompanies training. It does not replace it, and it does not replace sleeping or eating well either.

A well-bounded supplement is a supplement you can trust.

Who this is NOT for

This section is not negotiable, and we write it in full even though it does not sell.

• If you have kidney disease, a single kidney, or you are on dialysis. Your nephrologist decides this, not an article.
• If you have significant liver disease that has not been evaluated.
• If you are pregnant, trying to conceive, or breastfeeding: there is not enough data.
• If you take medications affecting the kidney and nobody has reviewed the combination.
• If you are not going to train. That is not a safety warning, it is an honesty one: without training you are not buying what was studied.
• If you expect it to fix your memory, your mood or your energy. That is not the evidence that exists.
• If you are under 18.

If you are in one of these boxes and someone sells you creatine anyway, that person is not looking after your health.

How it works at SCTS1

Here is the real order, no fine print.

SCTS1 does not prescribe or dispense medication. We work with two companies: Scientists One Health (SOH) for brand-name medications, and Altro Health, an independent licensed clinical platform, for compounded preparations. Once you start your program, a licensed physician reviews your case — habits, stress, sleep and medical history — and orders labs only if they consider it necessary. Eligibility is determined by medical evaluation. The order is this: you begin, the physician reviews, and only then is it decided what applies.

Creatine is not a prescription medication and you do not need a program to take it — it is a supplement sold in any pharmacy. We tell you that plainly because it is true. Where it does belong is inside a clinical conversation, particularly if you are losing weight and want to protect muscle while you do.

And one more thing, because it defines us: if your case points to the problem being something else, we will tell you.

Frequently asked questions

Does creatine damage your kidneys?

In healthy people at recommended doses, the most cited review concludes it does not. Lab creatinine can rise because it is the natural breakdown product of creatine, and that is not the same as kidney damage. If you have kidney disease, your physician decides.

Does it work if I do not train?

That was never tested. In the meta-analyses in older adults both groups were doing resistance training; creatine was measured on top of training, not instead of it.

Does it improve memory?

The evidence is far weaker than the headlines suggest. Of six studies in adults 55 and older, the single randomized trial found no cognitive effect, and four of the positive ones were cross-sectional dietary recall studies.

Do I need a loading phase?

No. Three to five grams a day reaches comparable saturation in about four weeks, with fewer digestive complaints.

Monohydrate or the newer forms?

Monohydrate is the one with the trials behind it. The other forms usually cost more without comparable support.

Sources

• Chilibeck PD, Kaviani M, Candow DG, Zello GA. Effect of creatine supplementation during resistance training on lean tissue mass and muscular strength in older adults: a meta-analysis. Open Access J Sports Med. 2017;8:213-226. — DOI
• Liu S, Huang N, Wu W, et al. The impact of creatine supplementation associated with resistance training on muscular strength and lean tissue mass in the aged: a systematic review and meta-analysis. Eur Rev Aging Phys Act. 2025;22(1):26. — DOI
• Marshall S, Kitzan A, Wright J, Bocicariu L, Nagamatsu LS. Creatine and cognition in aging: a systematic review of evidence in older adults. Nutr Rev. 2026;84(2):333-344. — DOI
• Antonio J, Candow DG, Forbes SC, et al. Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show? J Int Soc Sports Nutr. 2021;18(1). — DOI
• Buford TW, Kreider RB, Stout JR, et al. International Society of Sports Nutrition position stand: creatine supplementation and exercise. J Int Soc Sports Nutr. 2007;4:6. — DOI

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This article is informational and is not medical advice. SCTS1 does not prescribe medication. All medical care, prescriptions, and treatment plans are provided by licensed healthcare providers through our partner platform. Treatment eligibility is determined by a licensed provider through medical evaluation. Creatine is a dietary supplement and is not FDA-approved to treat, cure or prevent any disease. The figures cited are averages from specific populations and are not a prediction for your case. Talk to your physician before starting any supplement, particularly if you have kidney or liver disease. Individual results vary and are not guaranteed.