Search for supplements to keep muscle and you get a wall of things with no evidence, one thing with a lot of evidence, and no easy way to tell them apart. The one with evidence is creatine monohydrate, which is cheap, has been studied since the early nineties, and is genuinely boring.
The interesting part is the condition attached to it.
The short answer
Yes, modestly, and only alongside resistance training. A 2017 meta-analysis in Open Access Journal of Sports Medicine pooled 22 randomised controlled trials covering 721 men and women with a mean age between 57 and 70 across studies. Every trial ran creatine or placebo during resistance training two to three days a week, for somewhere between 7 and 52 weeks. The creatine groups ended with 1.37 kg more lean tissue mass than the placebo groups, with a confidence interval of 0.97 to 1.76 kg. Chest press and leg press strength improved too, by a smaller margin.
That is a real effect and a small one. It is the difference between a good outcome and a slightly better one, not the difference between losing muscle and keeping it.
What 22 trials in 721 older adults found
The reason that particular meta-analysis is the right one to quote here is the population. Most creatine research is done on young trained men, which tells you very little about someone in their fifties trying not to lose lean mass after a large weight loss. This one deliberately pooled older adults, and the effect held.
The size is worth sitting with. Gaining 1.37 kg more lean tissue over a span of up to a year is not visible in a mirror and will not show up as a dramatic change on any home scale. It is the kind of margin that matters cumulatively, over years, in the direction of not becoming frail. That is the honest frame for it.
Creatine does nothing without the training
This is the part the supplement aisle leaves out. In all 22 pooled trials, both arms were lifting. The comparison is training plus creatine against training plus placebo, so the whole measured effect is an increment on top of resistance training, not a substitute for it.
Creatine works by topping up phosphocreatine in muscle, which is what lets you produce force for a few more seconds before fatigue. More completed reps at a given effort means slightly more training stimulus, week after week. If there are no reps, there is nothing for it to improve. A supplement that makes hard work more productive is useless in the absence of hard work.
Which is why whether you are lifting at all is the question that dwarfs this one.
Why the scale goes up in the first week
Creatine is stored inside muscle cells, and it brings water in with it. That means people who start it frequently see the scale rise by a pound or two within the first week, sometimes more, with no change in body fat whatsoever.
For a general fitness audience that is a footnote. For someone in weight maintenance who has been burned by regain before, it is genuinely alarming, and it is the single most common reason people quit creatine in the first fortnight. The tell is timing: intracellular water shifts land in days, and tissue does not. If the scale steps up two pounds within a week of starting anything and then flattens, that is the same 3-to-1 water mechanism behind most overnight swings.
This is exactly the scenario OffRamp's Regain Radar is built for. It ignores any single reading and only flags when your seven-day rolling average sits at or above your baseline times 1.02 for seven consecutive days, with a second, louder threshold at times 1.04. A creatine water shift that lands and then holds steady does move the baseline comparison, so the honest thing to say is that it can trip a drift flag once. What it cannot do is trip one repeatedly, because the mechanism is a one-off step rather than a trend.
What the safety literature actually reports
The International Society of Sports Nutrition's 2017 position stand on creatine reviewed the accumulated safety evidence and concluded that creatine monohydrate is safe for healthy people taken over long periods, and found no support for the common claims about kidney damage or dehydration in that population.
Healthy people is doing real work in that sentence. Existing kidney disease, other medication, and pregnancy are all outside what those trials tested, and they are all reasons to raise it with your prescriber first. The same caution applies here as with the protein and kidneys question: the population where the warning is genuinely warranted is small, real, and not the general public.
Where it sits next to your protein floor
Order of operations matters more than any individual item. A person hitting their protein floor most days and lifting twice a week has the two inputs that carry almost all of the effect. Adding creatine to that is a sensible marginal improvement.
A person doing neither, who adds creatine, has bought a tub of powder and changed nothing. That is the failure mode worth naming, because supplements are easy and the other two are not. The evidence hierarchy here is not subtle: resistance training first, protein second, creatine a distant third.
How OffRamp handles supplements
It does not track them, and that was a deliberate call rather than an oversight. Adding a supplement log would have meant building a compliance surface around products the app has no ability to verify, and it would have implied the supplement mattered as much as the two things that do.
What OffRamp does instead is set a daily protein floor at 1.6 g per kg of your goal weight, rounded to the nearest 5 g, and ship three 20-minute strength plans, one bodyweight, one with dumbbells and one with bands, at two sessions a week. Those are the levers with the large effects. Creatine, if you and your prescriber decide it fits, sits quietly on top of them.
