Somewhere around 40, the weights you used to throw about start to feel heavier, recovery takes a day longer, and somebody tells you to take creatine. Fair enough. It's one of the most studied supplements going. But most of what's written about it is aimed at 22-year-olds chasing a bench-press number, and the research that speaks to older adults is a quieter story. Here's what it shows, where it runs out, and what to make of the loading phase everyone argues about.
What the muscle research shows
The strongest evidence for older adults is a 2021 meta-analysis in Nutrients that pooled randomised trials of creatine taken alongside resistance training. Across 16 trials and 509 people, those on creatine gained about 1.3 kg more lean tissue than those lifting on a placebo.[1]
Strength was a smaller story: a modest overall effect on chest press and a borderline one on leg press.[1] So think a modest edge, and only on top of lifting. Creatine doesn't do the training for you.
And a caveat worth saying plainly: those trials were in older adults, not men in their forties. Assuming the same pattern holds at 42 is a reasonable guess, not a proven fact. We've written about the same ingredient in a different group in Creatine for Women.
The brain question: interesting, unsettled
Creatine has a second life in cognition research. A 2025 narrative review in Frontiers in Nutrition summarises meta-analyses that found improvements in memory, attention time and processing speed, but no significant effect on overall cognition or executive function.[2] The same review rates the evidence as moderate for memory and low for the rest, and notes that some trials found nothing at all.[2] If a sharper head is your main reason for taking it, hold that loosely.
Loading: optional, and probably not worth the stomach
The classic protocol is about 20 g a day (0.3 g per kg of bodyweight) for five to seven days, then 3-5 g daily. The slower route skips the load: 3-5 g a day for roughly four weeks.[2] Harvard Health is blunt about it: loading up on a higher dose offers no advantages, and the larger doses add stress to the kidneys with nothing to offset it.[3]
There's a wrinkle. In the pooled older-adult data, the clearest chest-press result came from loading and then dropping to a lower dose, while a low dose without loading didn't reach significance. The authors flag that the studies measured doses differently, so the comparison is muddy. One loading study also reported more stomach upset during the loading week.[1] If you're patient, skip it and give it a month.
How to take it, and what to look for
The number to build around is 3 g. The EU authorises a claim that creatine increases physical performance in successive bursts of short-term, high-intensity exercise, at a daily intake of at least 3 g.[4] That's a claim for people doing high-intensity training, which is exactly what a heavy lifting session is.
That's the bar our Creatine Monohydrate Tablets are built around: each tablet is 1 g, so three a day gets you to 3 g. They're big tablets and we won't pretend otherwise. They can be split in half, and a full glass of water helps them down.
Whatever you buy, check where it's tested. The Frontiers review recommends third-party certification.[2] Ours is tested at manufacture and again by an independent laboratory, and made in the UK in BRC grade AA facilities.
Safety, plus a blood-test footnote
Studies of up to five years in healthy adults at recommended doses found no harm to kidney or liver function.[2] Creatine can nudge creatinine up on a blood test without signalling kidney trouble in a healthy person,[2] so mention it to your GP before your next check-up. If you have kidney or liver disease, speak to your GP before starting. Expect a couple of pounds of water weight in week one, which settles.[3] It isn't a steroid, and it doesn't raise testosterone.[3]
Training is the engine here. Creatine is a small, well-studied extra on top: three tablets, a glass of water, heavy lifting a couple of times a week. Start there and see how you feel in a month.
Frequently asked questions
Is creatine safe for men over 40?
For healthy adults at recommended doses, studies lasting up to five years found no harm to kidney or liver function, according to a 2025 narrative review.[2] If you have kidney or liver disease, or take regular medication, speak to your GP before starting.
Do I need a creatine loading phase?
No. Loading (around 20 g a day for 5-7 days) is one protocol, but studies also use 3-5 g a day for about four weeks with no loading phase,[2] and Harvard Health says loading offers no advantages.[3]
How long does creatine take to work?
Without a loading phase, studies use about four weeks of daily 3-5 g,[2] so give it a month before judging it. Our guide to how long creatine takes to work goes into the detail.
Will creatine make me bloated or heavier?
Some people hold a few pounds of water in the first week, which is temporary. Long-term studies don't show a lasting water-retention problem.[3]
Sources
- Forbes SC et al., Nutrients (2021) — meta-analysis of creatine strategies on lean tissue mass and strength in older adults; lean mass, strength, dosing and GI findings. https://mdpi.com/2072-6643/13/6/1912
- Li N, Frontiers in Nutrition (2025/26) — narrative review of creatine, exercise and ageing; cognition findings, dosing protocols, safety and third-party certification. https://www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2025.1687719/full
- Harvard Health Publishing (LeWine, March 2024) — what is creatine: 3-5 g dosing, loading, kidneys, water retention, testosterone. https://www.health.harvard.edu/exercise-and-fitness/what-is-creatine-potential-benefits-and-risks-of-this-popular-supplement
- NutraIngredients (2016) — report on EFSA creatine opinions, including the existing claim for performance in short, high-intensity exercise at 3 g or more daily. https://www.nutraingredients.com/Article/2016/02/24/EFSA-thumbs-up-for-creatine-muscle-strength-in-older-adults
At Oxford Origins, your wellbeing is our priority, and although we pride ourselves on our expertise in nutrition and supplementation, it's important to acknowledge the individuality of each person. Articles published by Oxford Origins are not intended to treat, diagnose, cure or prevent any disease, or replace the advice of your GP. We always recommend consulting with a healthcare provider if you encounter any health concerns, and we'll always be here to support you so you're never alone on your journey.
