Creatine: Useful Tool or Wellness Hype?

Creatine has been sitting in the back of supplement cabinets for thirty years, largely ignored by everyone who wasn’t actively trying to get bigger. It was a bodybuilding supplement. You took it if you wanted to look like the guy on the tub. If you were a runner, or a busy professional just trying to stay functional, you walked past it.

That story has changed pretty quickly. In the last two years (probably longer now?), creatine has become one of the most-discussed supplements in mainstream wellness circles — appearing in podcasts aimed at women in their 40s, in longevity content, in conversations about cognitive decline, fatigue, mood, and menopause. The claims have gotten a lot bigger than “add two inches to your arms.”

So the question worth asking: is this a legitimate expansion of what we know creatine can do, or is it a supplement with a solid reputation in one lane getting co-opted by the broader wellness industry the moment it needed a new story?

The honest answer is both. And knowing which parts are which is where the actual value lives.

What Creatine Actually Does in the Body

Before the claims, the mechanism — because this is where most supplement marketing goes wrong. If you understand what creatine does at the cellular level, you can evaluate almost any claim made about it yourself.

Caution, nerdy talk ahead…

Creatine is a compound your body produces naturally, primarily in the liver, and stores in muscle tissue as phosphocreatine. Phosphocreatine’s job is to rapidly regenerate ATP — adenosine triphosphate — which is the energy currency your cells run on. When you do something intense and brief (a heavy deadlift, a sprint, a max-rep pull-up set), your muscles burn through ATP faster than your aerobic system can replenish it. Phosphocreatine bridges that gap.

Supplementing with creatine increases phosphocreatine stores. More phosphocreatine means more capacity to sustain high-intensity effort before fatigue sets in. That’s the mechanism. Everything else — including the cognitive claims — has to trace back to this same phosphocreatine pathway or a related mechanism to be biologically plausible.

Your body gets some creatine from meat and fish. Vegetarians and vegans have significantly lower baseline stores, which is relevant when evaluating how much benefit someone might actually get from supplementation. A person with depleted stores has more room to gain than someone already near saturation.

The Belief Worth Disrupting Here

The false belief running through most of the current creatine conversation isn’t that creatine works — it largely does, in the right contexts. The false belief is that more evidence equals more benefit, or that if something works for one purpose, adding new purposes is just a matter of time.

That’s not how this works. Evidence is specific. It applies to populations, doses, contexts, and outcomes that were actually studied. The jump from “creatine helps strength athletes recover between sets” to “creatine will sharpen your thinking and lift your mood” requires evidence of its own — and that evidence is in a very different state depending on which claim you’re evaluating.

The wellness industry’s relationship with emerging research tends to treat “possible” and “proven” as the same word.

They’re not

Understanding where creatine sits on that spectrum — and for which outcomes — is the difference between using a tool well and buying into hype.

Where the Evidence Is Actually Strong

Let’s start with what’s well-established, because it’s genuinely worth knowing even for athletes who’ve never cared about supplementation.

Strength and power output. The evidence base here is large, consistent, and spans decades. Creatine supplementation meaningfully increases performance on short-duration, high-intensity efforts — heavy lifting, sprints, repeated efforts with brief rest. Meta-analyses consistently show improvements in maximal strength and power output, with effect sizes that are real and practically meaningful. If your training involves compound barbell work, loaded carries, sprint intervals, or anything that demands repeated bursts of intensity, creatine has a documented upside.

Muscle hypertrophy. Creatine doesn’t directly build muscle. What it does is allow you to train harder, recover faster between sets, and accumulate more quality work over time — which drives adaptation. The muscle gain associated with creatine is largely a downstream effect of improved training capacity, combined with the intracellular water retention creatine causes (which increases cell volume in a way that may signal anabolic pathways). It’s real, but calling creatine a “muscle builder” the way most supplement marketing does is imprecise.

High-intensity endurance. Tactical athletes doing interval work, repeated sprints, or efforts that cycle between high intensity and brief recovery will likely see benefit. Long, slow endurance (marathon pace, easy rucking) probably won’t move much — the phosphocreatine system isn’t the limiting factor there, but…

Recovery between sessions. There’s decent evidence that creatine reduces markers of muscle damage and inflammation following intense training, which can shorten the time between quality sessions. For someone training four to five days a week, that’s practically relevant.

Older adults — this is underappreciated. The evidence for creatine in adults over 50 is among the strongest in the entire literature, and it’s getting almost no attention in the conversations aimed at this demographic. Muscle loss (sarcopenia) accelerates with age, and creatine combined with resistance training has been shown to produce significantly greater preservation of lean mass than resistance training alone in older populations.

If you’re in your 40s or 50s and training to stay functional — which is exactly the Strategic Athlete audience — creatine may have a stronger case for you than it did when you were 25.

Where the Evidence Is Emerging (and What That Actually Means)

Now the part that’s generating most of the current attention.

Cognitive function. The brain uses ATP. The phosphocreatine system operates in neurons. The logic, then, is that creatine supplementation could improve brain energy availability, particularly under conditions of cognitive stress, sleep deprivation, or fatigue. This is biologically plausible and there are studies showing cognitive benefits — particularly on tasks requiring short-term memory and processing speed.

Here’s the critical context: most of the positive cognitive findings come from specific populations (vegetarians, sleep-deprived individuals, older adults) and specific conditions (acute mental fatigue, sleep deprivation).

Effects in well-rested, omnivorous adults are modest and inconsistent. The current evidence supports “possibly useful under certain conditions” — not “this will make you sharper.”

Anyone selling creatine primarily on cognitive benefits is running significantly ahead of the data.

And if you don’t have those other lifestyle factors sorted out, a supplement is unlikely going to move the needle…

Mood and depression. A handful of studies have looked at creatine’s potential role in depression, building on the hypothesis that impaired brain energy metabolism is a factor in mood disorders. Some findings are interesting. A few small trials have shown that creatine augmentation alongside antidepressants produced faster response than medication alone. The data is preliminary, the samples are small, and we are a long way from clinical recommendations. This is genuine research worth watching but it’s not a reason to start recommending creatine as a mood supplement.

Women and hormonal context. The interest in creatine among women — particularly perimenopausal and postmenopausal women — is a legitimate area of inquiry. Estrogen appears to play a role in the creatine transport system, and the decline in estrogen during menopause may reduce baseline creatine availability in muscle and possibly brain tissue. Some researchers have proposed that women in hormonal transition might have more to gain from supplementation. The existing evidence is suggestive but limited — we need longer, larger studies designed specifically for this population before making strong recommendations. That said, there’s also no reason for women to avoid creatine based on current evidence, and the general muscle-preservation argument is just as relevant for women over 50 as for men.

Fatigue and chronic fatigue. Early research has looked at creatine in the context of fatigue-related conditions. This is probably the least developed area of the current conversation, and the extrapolation from exercise-related fatigue to systemic or condition-based fatigue is not straightforward.

What to Actually Do With This

Practical application for a busy professional who wants to use what’s proven without chasing what’s speculative:

The dose question. Loading phases (20g per day for 5–7 days) were common in older protocols. They work, but cause more GI discomfort and the saturation effect is temporary. The approach that most people tolerate better and that produces equivalent results over time: 3–5g of creatine monohydrate per day, taken consistently. That’s it. Daily consistency matters more than timing.

Creatine monohydrate only. The supplement industry has spent thirty years trying to create premium versions of creatine — creatine ethyl ester, buffered creatine, creatine HCl, creatine nitrate. None of them have demonstrated superiority to monohydrate in head-to-head trials. Monohydrate is the most researched, cheapest, and most effective form. If a product is selling “advanced creatine” at three times the price, that’s marketing, not science.

Timing is not that important. “Take it pre-workout, post-workout, with carbs, without carbs” — most of this is noise. The phosphocreatine system replenishes over hours, not minutes, so precise daily timing matters far less than simply taking it every day. If it’s easier to remember with breakfast, take it with breakfast.

Expect the weight bump. Creatine causes intracellular water retention — 1 to 3 pounds is typical in the first week or two, particularly in muscle tissue. This is not fat. It’s also not just “water weight” in the pejorative sense — it reflects that your muscles are storing more creatine alongside more water, which is part of how it works. Just know it’s coming so it doesn’t freak you out when you step on the scale in the morning.

Hydration matters more when supplementing. The increased cellular water retention means you may need slightly more total water intake, particularly during hard training blocks. This is not a dramatic change — an extra glass or two per day is usually sufficient.

Who gets the most benefit? Realistically: people doing consistent resistance training or high-intensity interval work, older adults (especially those over 50), vegetarians and vegans with depleted baseline stores, and anyone doing sessions involving repeated bursts of high effort with brief recovery. People doing mostly long, easy aerobic work will see less. People eating plenty of red meat and already near saturation will see less. Manage expectations accordingly.

What I’ve Seen Over Time

I’ve coached athletes through several full cycles of supplement trends — most of which came and went without changing much. Creatine is different because the foundational evidence is actually strong, and that’s unusual in the supplement world.

The athletes I’ve worked with who’ve added creatine monohydrate consistently — particularly those in their late 30s through 50s — have reported two things with enough regularity that I take it seriously: better training quality during later sets (which aligns with what the evidence predicts), and faster recovery between hard days.

Whether this is measurable or just perceived depends on the person and their training. What I don’t see is dramatic cognitive enhancement or mood transformation — those claims don’t match what the athletes I coach are actually experiencing, which is consistent with where the evidence sits but honestly there are so many other factors at play who knows for sure?

One 47-year-old Army officer I coached added 5g of creatine monohydrate daily over a 12-week Foundations cycle. His three-rep max deadlift went up about 20 pounds. His run times didn’t move. His sleep didn’t change. He felt like he was training “with a little more in the tank” on his later sets. That’s exactly what the evidence predicts. Not miraculous. Useful.

Was this the creatine? Or just the effects from consistent training?

Honestly, hard to tell.

But like I’ve talked about a bunch in the past, everyone is different and the only way to really know if something works for you is to be your own experiment.

Try to control as many factors as you can (Training, sleep, diet, etc)

Add 5g/day of creatine into your daily routine for a couple weeks

Write down how you’re: a.) looking, b.) feeling, and c.) performing

Those things getting better?

Keep it up!

If not, switch it up, start over, and try something new. #science

Keep Learning

• Post-Workout Nutrition
• Hydration
• The Importance of Sleep
• 1 Simple Method for Improving Your Body Composition
• Brilliance in the Basics

FAQ

Does creatine work for endurance athletes?

For sustained, low-intensity aerobic work — long rucking at easy pace, marathon running — creatine is unlikely to produce noticeable benefit. The phosphocreatine system isn’t the limiting factor there. Where endurance athletes do see benefit is in high-intensity intervals, sprint work, and repeated short efforts with brief rest periods. If your endurance training includes those elements, creatine may help the quality of that work.

Is creatine safe for long-term use?

Yes, based on the existing evidence. Creatine monohydrate is among the most studied supplements available, with research spanning decades and covering daily use over multiple years. No credible evidence links it to kidney damage in healthy individuals — that concern originated from a single case study involving someone with a pre-existing kidney condition. Standard medical caveats apply: if you have existing kidney issues, check with your physician first.

Why does creatine cause weight gain and is it a problem?

The weight gain from creatine is intracellular water retention — your muscle cells hold more water alongside the additional phosphocreatine. One to three pounds in the first week or two is typical. This is not fat and does not reflect a change in body composition in any meaningful negative sense. It can be relevant if you’re weight-class restricted or tracking body composition metrics closely — in which case, time your creatine loading accordingly.

Should women take creatine differently than men?

Current evidence doesn’t support a dramatically different protocol. Some researchers have proposed that women, particularly in perimenopause or postmenopause, may benefit as much or more than men due to the role estrogen plays in the creatine transport system. The practical recommendation is the same: 3–5g of creatine monohydrate daily, consistently. The evidence base for women is smaller but the safety profile is equivalent. Women doing resistance training with any performance or body composition goal have reasonable grounds to consider supplementation.

What about all the other forms of creatine being sold?

Creatine monohydrate remains the standard. Creatine HCl, creatine ethyl ester, buffered creatine, and other branded variants have not consistently outperformed monohydrate in well-designed head-to-head comparisons. They are usually more expensive and occasionally better tolerated by people who experience GI discomfort from monohydrate — in which case a smaller daily dose of monohydrate (2–3g instead of 5g) often resolves the issue without requiring a more expensive form.

Creatine is a genuinely useful tool for the right context. The performance and recovery evidence is solid. The cognitive and mood research is early, interesting, and worth watching — not worth centering your decision around. Take 3–5g of creatine monohydrate daily, train hard, eat enough protein, and let the evidence-backed part do what it’s actually been proven to do.

1% Better Every Day.