Your Clients Keep Asking About Creatine. Here's the Evidence — and the Script.

How we sourced this. Every claim below is tied to a named study — a meta-analysis, a randomised trial, or the live trial registry — and linked. We also graded the evidence: where it’s strong, we say so; where it’s early or thin, we say that too. This piece was reviewed for accuracy before publishing and carries a real byline, because on health topics a citation you can’t stand behind is worse than no citation at all. Last updated 6 July 2026.

The most-asked question in your gym, answered properly

Every coach fields the creatine questions. Does it actually work? Will it wreck my kidneys? Will it make my hair fall out? Do I need to load it? Is it just for men?

Most of the answers floating around your gym floor are half-remembered forum posts. So we did the boring, valuable thing: pulled the meta-analyses and the newest randomised trials, graded them, and checked the trial registry for what’s still unsettled. Here’s what the evidence actually supports — written so you can use it with a client today, not so you can pass a biochemistry exam.

One framing up front: creatine is the most-studied sports supplement in existence, and the gap between what the science says and what gym culture believes is enormous. That gap is your opportunity as a coach. You get to be the person who knows.

What it actually does (this part is settled)

For strength and lean mass in people who lift, the evidence isn’t ambiguous. A 2024 meta-analysis of 23 studies found creatine combined with resistance training produced meaningfully greater strength gains than training alone — a weighted mean difference of +4.43 kg on upper-body and +11.35 kg on lower-body strength versus placebo. That’s not a rounding error; that’s a real edge for a client, from a supplement that costs a few cents a day.

The mechanism is unglamorous and worth knowing: creatine helps your muscles rapidly regenerate ATP, the currency of short, hard efforts. More available energy for that fifth rep, set after set, week after week — and those extra reps are where adaptation actually comes from. Creatine doesn’t build the muscle. It lets your client do the work that builds the muscle.

One honest nuance for the DEXA-obsessed: some of the very early “lean mass” bump is water drawn into the muscle, not new tissue — a 2025 RCT showed a measurable jump within the first seven days that reflects that short-term effect. Real strength and hypertrophy come from the training the creatine enables, over months. Set that expectation and you’ll never have a client panic about the scale in week one.

Evidence grade: strong. Multiple meta-analyses, consistent direction, decades of replication.

Dosing: you’ve been overcomplicating it

Here’s the whole protocol: 5 grams of creatine monohydrate a day, every day. That’s it.

The “loading phase” you’ve heard about — 20 g/day for about a week — genuinely works, and it fills your muscle stores faster. But a 2024 dosing review is clear that loading changes how fast you get to full stores, not whether you get there. Skip loading and take 5 g/day, and you reach the same place in roughly three to four weeks. For most clients, the simpler protocol wins because they’ll actually stick to it.

Timing is a non-issue. Before training, after, or with breakfast — it doesn’t meaningfully matter. Don’t let a client turn “when do I take it” into a reason to not take it. Consistency is the only variable that counts.

Evidence grade: strong for the dose; the small extra benefit of taking it with carbs post-workout is real but minor.

The three myths that cost you client buy-in

”Creatine will ruin my kidneys”

This is the objection dressed up as caution, and it’s not supported by controlled research in healthy people. The confusion is almost poetic: creatine spontaneously converts into a waste product called creatinine — which is exactly what a standard kidney test measures. So supplementing can nudge that marker up without anything being wrong with the kidney at all. Narrative reviews of the controlled evidence conclude creatine is safe for renal function in healthy individuals. The honest caveat: people with pre-existing kidney disease, and pregnant clients, weren’t the subjects of this research — so for them, the answer is “talk to your doctor,” not “go ahead.”

Evidence grade: strong for healthy adults; genuinely unstudied in kidney-disease and pregnancy — don’t advise there.

”Creatine causes hair loss”

This one has a real origin story, and it’s a masterclass in how a myth is born. In 2009, a small study of 20 rugby players found creatine raised DHT — a hormone linked to male-pattern baldness — by around 56%. Note what that study did not measure: anyone’s actual hair. It measured a hormone proxy and speculated.

For sixteen years that single result was the entire basis for the hair-loss fear. Then in 2025, researchers finally ran the direct test: a randomised controlled trial that measured hair follicle health — density, thickness, follicle counts — over 12 weeks. The result: no difference in DHT, in the DHT-to-testosterone ratio, or in any hair outcome versus placebo. The authors called it strong evidence against the claim.

Could an individual respond differently? Possibly — no study covers everyone. But when a client raises this, you’re no longer choosing between “reassure them and hope” and “shrug.” You can say: the one study people cite measured a hormone, not hair; the study that measured hair found nothing.

Evidence grade: the direct evidence (measuring hair) now points to no effect. The scary number came from a proxy.

”It’s a men’s supplement”

Backwards, if anything. Women carry 70–80% lower baseline creatine stores than men, and the research base — historically skewed male — is now expanding into exactly the moments that matter for female clients: strength across the lifespan, the menopause transition, mood and cognition. Pre-menopausal women see strength and performance benefits; higher-dose protocols show promise for older women’s muscle and bone when paired with resistance training. If anything, your female clients have been under-sold creatine because of a culture problem, not an evidence problem.

Evidence grade: growing and positive; still fewer female-specific trials than male, which is changing fast.

The “maybe” pile — promising, not proven

This is where an honest coach earns trust: knowing the line between supported and being studied.

There’s genuinely interesting evidence that creatine supports memory, with a moderate-certainty effect and a notably larger benefit in older adults. That’s real, and it’s a fair thing to mention — as a possible bonus, not a headline promise. Beyond that, researchers are actively investigating creatine’s role in areas like concussion recovery, mood, and healthy ageing. Those are open research questions, not established coaching claims. If you find yourself telling a client creatine “treats” anything, stop — that’s a sentence for a doctor and a finished trial, not a gym floor.

Evidence grade: memory, moderate; everything else here, early — frame as “researchers are studying,” never as a promise.

What’s about to be proven (the part nobody else shows you)

Here’s what a static supplement encyclopedia can’t give you: the live edge of the field. Right now the clinical registry lists 60+ creatine trials recruiting or about to start — and the pattern in them tells you where the puck is going.

The one to watch: creatine during GLP-1 (weight-loss drug) use. Several new trials are testing whether creatine plus resistance training can protect lean muscle in people losing weight on these medications — because muscle loss is one of the real downsides of that fat loss. Your clients are already on these drugs, or asking about them. Nobody can claim creatine is proven for this yet. But the coach who understands the question before the answer arrives is the coach clients trust when it does.

Other live threads: dosing strategies specific to older adults, creatine through the menopause transition, and recovery applications. We’ll update this piece as those trials read out — that’s the point of an evidence page that’s alive instead of frozen.

Your script for Monday

When the next client asks, here’s the whole thing in plain language:

“Take five grams of creatine monohydrate a day, any time, every day. It’s the most-researched supplement there is — it’ll help you get more out of your training over the next few months. You don’t need to ‘load’ it and you don’t need the fancy versions. The kidney and hair-loss worries aren’t supported by the studies that actually measured them. If you’re pregnant or have a kidney condition, check with your doctor first. Otherwise, it’s about as safe and proven as supplements get.”

That’s it. No hedging, no bro-science, no overpromising. Just the evidence, translated into something a human can act on — which is the entire job.

Sqwod reads the research so your clients don’t have to. This is coaching information, not medical advice; anything involving a medical condition, pregnancy, or medication belongs with a qualified professional. Spotted something that needs sharpening? That’s how an evidence page stays honest — tell us and we’ll correct it in public.