Creatine for Executives: The Most Underrated Supplement in the Cabinet

If I could only keep three supplements for my executive clients, creatine monohydrate would be one of them — and it would not be a close call. That surprises people. Creatine has spent thirty years carrying the reputation of a locker-room supplement, something for twenty-two-year-olds chasing a pump. Meanwhile, in the research literature, it has quietly become one of the most studied, safest, and most broadly effective compounds we have — for muscle, yes, but also for the brain. Dr. Jason Rannfeldt recommends it to nearly every client over forty, and this article is why: what creatine actually does, what the evidence shows for cognition and brain energy specifically, and the exact protocol I put executives on.

You know my framework by now: supplements sit on top of the foundation, never in place of it. The full hierarchy is in The Executive Supplement Audit — and creatine earns its spot because it supports two things every high performer is actively losing after forty: muscle tissue and cellular energy. Both stories end up in the same place, the mitochondria, which I covered in Mitochondrial Health: The Cellular Engine of Executive Energy.

What creatine actually does — in plain terms

Every cell in your body runs on a molecule called ATP — adenosine triphosphate — the spendable currency of cellular energy. When a cell spends ATP, it becomes ADP, and the cell has to reload it. Creatine is the fast-reload system. Your muscles and your brain store creatine as phosphocreatine, a reserve that converts ADP back into ATP in milliseconds, without oxygen, without glucose, without anything but the stored creatine itself. More stored creatine means a bigger energy buffer for the two tissues that burn energy hardest: skeletal muscle and brain.

Your body makes some creatine and you get some from red meat and fish, but dietary intake has been falling for decades as protein quality has declined — one of the patterns behind the muscle-loss problem in Protein and Muscle Longevity. Supplementation with creatine monohydrate reliably raises muscle and brain stores by twenty to forty percent. That is not a marginal effect. Very few supplements move a physiological reservoir by a third.

The muscle case: the one you already knew about

The strength evidence is the most replicated in all of sports science: creatine improves strength, power, and lean mass gains from resistance training, with hundreds of controlled trials behind it. For my clients the value is not bigger biceps — it is the fight against sarcopenia, the age-related muscle loss that accelerates after fifty and drives frailty, metabolic decline, and falls. The stakes are laid out in Strength Training After 40 and Bone Density and Skeletal Longevity. Creatine does not build muscle by itself; it makes the training you do produce more muscle per session. It is a multiplier on work, not a substitute for it.

There is a second muscle benefit executives miss: glycogen. Creatine increases muscle glycogen storage, and muscle is your largest glucose sink — the tissue that determines how well you handle the carbohydrate in your meals. Better muscle glucose handling supports the metabolic stability I wrote about in Metabolic Flexibility for Executives and Blood Sugar and Executive Focus.

The brain case: the one you did not

Here is where creatine gets interesting for the executive reading this between meetings. Your brain is two percent of your body weight and burns twenty percent of your energy. That energy runs on the same ATP system, and the brain keeps its own creatine reserve. When brain energy demand spikes — sleep deprivation, long cognitively brutal days, stress — the creatine buffer matters, and supplementation appears to help most exactly under those conditions.

The cognitive studies show a consistent pattern: the benefits are largest when the brain is under energy stress. Sleep-deprived subjects perform better on working memory and processing tasks with creatine. Vegetarians — who carry lower baseline stores — show larger gains than meat-eaters. Older adults show more benefit than younger ones. Read those three findings together and you get the profile of who creatine helps most: a person over forty, sleeping less than they should, running a cognitively expensive schedule. In other words, my entire client roster. The sleep piece connects to Sleep Optimization for Executives — creatine does not replace sleep, but the evidence suggests it partially blunts the cognitive cost of a short night, which is a useful buffer on the weeks travel wrecks your schedule, as covered in Travel, Jet Lag, and Executive Performance.

There is also emerging research on creatine and mood — particularly alongside standard approaches to low mood and burnout physiology. The data is early and I do not prescribe around it, but the mechanism is the same cellular-energy story, and it fits the bigger picture in Rebuilding Health After Burnout: depleted systems underperform, and energy availability is upstream of almost everything.

Safety: thirty years of data

Creatine monohydrate has one of the deepest safety files in the supplement world — decades of trials, long-term studies, reviews by the major sports-medicine bodies. The persistent myths deserve a direct answer. Kidneys: creatine raises creatinine slightly on bloodwork — a breakdown product, not kidney damage — and studies in healthy adults show no harm to kidney function at standard doses. Tell your physician you take it so the creatinine number is interpreted correctly, and fold it into the conversation from Executive Bloodwork and Biomarkers. If you have diagnosed kidney disease, that is a physician conversation first. Water retention: real but modest — a pound or three of water inside muscle cells, where you want it. Hair loss: one small study, never replicated, widely overcited. The weight of evidence says no.

The protocol I give executives

This is deliberately boring, because boring is what works. What: creatine monohydrate — plain, unflavored, third-party tested. It is the form used in virtually all the research and it costs about ten cents a day. Every other form — ethyl ester, buffered, liquid — is marketing. Dose: five grams daily. Every day, including rest days and travel days, because the goal is saturated tissue stores, not a workout boost. Loading: unnecessary. Twenty grams a day for a week gets you to saturation slightly faster; five grams daily gets you there in about a month with less GI complaint. I skip loading. Timing: whenever you will remember it. The evidence on timing is thin; the evidence on consistency is everything — the same habit logic as Why Willpower Is the Wrong Tool for Behavior Change. Most clients drop it in their morning water or coffee, stacked onto the sequence in The Morning Routine That Actually Moves the Needle.

Two execution notes. First, hydration: creatine pulls water into muscle, so keep fluid intake honest — the targets are in Hydration and Electrolytes. Second, patience on the scale: the first two weeks may add a couple of pounds of intramuscular water. That is not fat, it is the mechanism working, and clients who understand that do not panic and quit a supplement that is quietly doing its job.

Where it sits in the hierarchy

Same hierarchy as always. Tier one is training, sleep, protein, and stress — the programs inside Crush 90 and Thrive 90 exist because those levers dwarf everything else. Within the supplement tier, creatine is at the top of my list: cheapest per benefit, deepest evidence file, relevant to both the muscle you are trying to keep and the brain you make your living with. I wrote a companion piece on the mindset of building a minimal, evidence-first supplement stack over at jasonleerannfeldt.me — the short version is that the best stack is a short one you actually take.

The bottom line

Five grams of creatine monohydrate, every day, in whatever drink you already make every morning. Expect better training returns, a modest cognitive buffer on your worst-slept days, and a safety profile thirty years deep. It is the least glamorous recommendation I make and one of the highest-return. Judge it at eight weeks the way we judge everything — against your training numbers and your recovery metrics from Recovery Metrics That Matter.

If you want your training, nutrition, labs, and supplements sequenced into one system built around your actual calendar, that is the work inside Crush 90 and Thrive 90. Start with a short conversation on the contact page, or read more about the approach on the about page.