From the gym to neurology, creatine is increasingly mentioned as a supplement that goes beyond sport. This article goes through what is actually known, how to use it, and which popular claims simply aren’t true.
If there is one supplement that has passed the strictest possible scientific scrutiny and emerged from it practically unscathed, it is creatine monohydrate. More than 500 peer-reviewed studies, dozens of meta-analyses, and position stands from leading sports nutrition bodies consistently confirm the same conclusions: creatine safely and effectively increases strength, muscle mass, and athletic performance in most healthy adults. [1]
Yet in the past few years, creatine has stepped outside a purely sporting context and found its way into conversations about mental health, cognitive function, and aging. At the same time, myths circulate around it that unfairly demonize it, from alleged dangers to the kidneys to the claim that it’s “only for men”. This article goes through all of it with one goal: to give you a clear, layperson-friendly picture of what creatine is, what it does, and how to use it if you decide to.
What is creatine and how does it work in the body?
Creatine is not a foreign chemical compound. It is a natural substance found in your body. It is synthesized in the liver, kidneys, and pancreas from the amino acids arginine, glycine, and methionine, and is stored predominantly in skeletal muscle (about 95%) in the form of phosphocreatine. [2] The average person has about 120 mmol/kg of dry muscle creatine in their muscles, with a maximum storage capacity of about 160 mmol/kg.
The role of phosphocreatine in muscles is concrete and mechanistically clear: when you perform an intense activity lasting between a few seconds and about 30 seconds (sprinting, lifting weights, an explosive jump) the body needs ATP (adenosine triphosphate, the cell’s “energy currency”) faster than it can produce it from fat or sugar. This is where phosphocreatine steps in: it donates a phosphate group to convert ADP (spent ATP) back into ATP, extending the duration of maximal effort. [2] Supplementing with creatine fills these stores above natural levels, meaning more energy is available at key moments.
| 120 mmol/kg | 95% | ~1–2 g/day | 160 mmol/kg |
| average muscle creatine level in a healthy adult (without supplementation) | of creatine stored in skeletal muscle (the rest in the heart, brain, testes) | daily endogenous creatine synthesis in the body | maximum muscle creatine storage capacity — the target of supplementation |
Is the hype justified? What studies actually say about strength and muscle mass
The short answer: yes, for most people. A systematic review and meta-analysis published in Nutrients 2022, which reviewed 16 randomized controlled trials from the 2012–2021 period, concluded that creatine is effective for muscle mass growth in healthy young adults who train regularly, noting that the effect is not equally pronounced in all populations. [3] The strongest effects are consistently recorded in people who combine supplementation with resistance training (weightlifting, bodyweight exercises).
The most comprehensive review to date, the position stand of the International Society of Sports Nutrition (ISSN) from 2017, which synthesized data from more than 500 studies, concludes that creatine monohydrate is the safest and most effective ergogenic nutritional supplement currently available to athletes. The average increase in one-repetition maximum (1RM) across studies is 5–15% compared to placebo, with a muscle mass increase of 1–3 kg in short-term protocols (4–12 weeks). [1]
A meta-analysis published in 2025 in Nutrients, which analyzed randomized controlled trials in adults of all fitness levels, confirmed a statistically significant positive effect of creatine supplementation on upper- and lower-body strength, measured by bench press, leg press, and handgrip, regardless of age and sex. [4]
„Creatine monohydrate is the safest and most effective ergogenic nutritional supplement currently available to athletes.” — ISSN position stand, 2017.
Who doesn’t respond to creatine?
About 25–30% of people are classified as “non-responders”. Their muscles already have naturally high creatine levels and supplementation doesn’t raise them significantly further. This is seen more often in people who regularly consume meat and fish (which are rich in creatine) compared to vegetarians and vegans, who have lower baseline levels and typically show a more pronounced response. [1] If you’ve tried creatine for weeks and haven’t noticed a change, you might be a non-responder. And that is physiologically normal, not a failure of the supplement.
Creatine outside the gym: the brain, aging, and mental health
Cognitive function and the brain
The brain consumes about 20% of the body’s total energy despite making up only 2% of body mass. Phosphocreatine plays a role in brain energetics analogous to that in muscles, which has led researchers to investigate whether supplementation can improve cognitive function, especially under conditions of stress, fatigue, or sleep deprivation.
A meta-analysis published in Frontiers in Nutrition 2024, which included 16 randomized controlled trials with 492 participants aged 20–76, showed that creatine supplementation has a statistically significant positive effect on memory (SMD = 0,31; 95% CI: 0,18–0,44) and information processing speed. [5] The effects were most pronounced in the older population and in vegetarians, which is consistent with the assumption that the benefit comes precisely from replenishing low baseline creatine stores in the brain.
A review article published in Sports Medicine 2023 (with a 2023 correction) concludes that creatine supplementation can increase brain creatine stores and that this potentially explains the positive effects on cognition and memory, especially in older populations or under conditions of metabolic stress such as sleep deprivation. [6] It’s important to emphasize: studies in healthy young adults show less consistent effects. The so-called “cognitive benefit” of creatine is likely most pronounced when baseline stores are low.
Mental health and depression
One of the surprising and increasingly researched areas is the potential role of creatine in treating depression. A study published in the American Journal of Psychiatry (Lyoo et al., 2012); a randomized, double-blind, placebo-controlled experiment, showed that women with a major depressive episode who received creatine alongside an SSRI antidepressant (5 g/day for 8 weeks) reached remission significantly faster and at a higher rate than the placebo group (Cohen’s d = 0,83). [7]
The mechanism is not fully understood, but likely involves creatine’s effect on brain bioenergetics and the regulation of neurotransmission. A systematic review and meta-analysis published in 2024 concludes that there are promising signals for creatine as an add-on therapy in depression, but notes that the overall quality of evidence is still limited and that larger studies are needed. [8] This is not a recommendation for self-therapy, but it is the reason why a growing number of psychiatrists and researchers are following this area with interest.
Aging and sarcopenia
Sarcopenia, the loss of muscle mass and strength that comes with age, is one of the leading causes of falls and reduced functional independence in older adults. A meta-analysis published in Nutrients 2021 (Forbes et al.) reviewed 22 randomized controlled trials and concluded that the combination of creatine and resistance training statistically significantly increases muscle mass and strength in adults over 50 compared to training and placebo. [9] Creatine in this context is not a “muscle-building” supplement, it is a supplement that can help older adults retain functionality and independence.
How to use creatine properly: dosing, loading, and timing
How much to take?
The standard recommended by the ISSN and confirmed in hundreds of studies is 3–5 grams of creatine monohydrate per day as a maintenance dose. For larger individuals (90+ kg), 5 g per day may be warranted. There is no evidence that doses higher than this provide additional benefit in healthy adults; muscle stores simply cannot store more than their maximum capacity. [1]
Is a “loading phase” necessary?
A loading phase, taking 20 g/day split into 4 doses over 5–7 days, saturates muscle stores faster (in about a week) than the standard dose. However, the classic study by Hultman and colleagues (1996), published in the Journal of Applied Physiology, showed that 3 g per day over 28 days achieves the same total increase in muscle creatine as a loading protocol of 20 g/day for 6 days. [10] The end result is identical, loading just speeds up the path. If you’re not in a hurry or have a sensitive digestive system, feel free to skip the loading phase.
The only practical advantage of loading is a faster onset of effect, which can be relevant right before a competition or a short-term training program. For most recreational users, a simple daily protocol of 3–5 g without a loading phase is the optimal choice.
When to take it?
The good news: the timing of creatine intake is not a critical factor. A meta-analysis comparing creatine intake immediately before and immediately after training showed a slight advantage for post-workout intake, but the difference was small and of questionable clinical relevance. [1] The most important thing is consistency; take it every day, at the same or similar time, on rest days just as on training days. Creatine builds up in muscles gradually; missing one day won’t undo the effect, but longer intermittent use slows saturation.
THE 3-STEP PROTOCOL — WHAT WORKS
- DOSE: 3–5 g of creatine monohydrate per day (no need for more than that)
- LOADING (optional): 20 g/day split into 4 servings over 5–7 days for a faster start; same end effect, achieved faster
- WHEN: Every day, training and non-training days, consistently. Timing (morning/evening, pre/post workout) is of secondary importance
- FORM: Creatine monohydrate is the gold standard; cheaper and better researched than all “advanced” forms like HCl, buffered, or Kre-Alkalyn formulations
Myths and truths: what creatine is NOT
| MYTH: Creatine damages the kidneys. TRUTH: This is the most widespread and unfounded myth. A systematic review and meta-analysis published in BMC Nephrology 2025, which analyzed randomized controlled trials, found no significant negative effects of creatine on kidney function (GFR) in healthy adults. [11] The ISSN concludes: “There is no scientific evidence of harmful effects on the kidneys or liver at recommended doses.” Creatine increases creatinine levels in urine, which may look concerning on bloodwork, but this is a normal metabolic consequence, not a sign of damage. Caution is warranted only in people with pre-existing kidney disease. |
| MYTH: Creatine is a steroid or some kind of doping agent. TRUTH: Creatine is not a steroid and is not on any banned-substance list, not WADA’s, not the IOC’s, nor that of any sports federation. It is a natural substance that the body synthesizes on its own and that is also taken in through everyday food (meat, fish). Supplementation is the equivalent of eating a lot of beef, just more practical and economical. |
| MYTH: Creatine causes muscle cramps and dehydration. TRUTH: This claim originates from early misunderstandings about how creatine affects intracellular osmotic pressure. A meta-analysis published in Nutrients 2021 (Wax et al.) clearly states that there is no clinical evidence for an increased incidence of cramps, dehydration, or heat-related issues with creatine supplementation. [12] In fact, some studies suggest that creatine may even reduce the incidence of cramps during exercise in the heat. |
| MYTH: Creatine is only for men and bodybuilders. TRUTH: Women respond to creatine just as men do — the physiological mechanisms are identical. A review of evidence conducted by Smith-Ryan and colleagues (2021) confirmed that creatine is safe and effective for women at all life stages, with particularly promising evidence for protecting muscle mass during perimenopause and menopause. [1] Older adults, vegetarians and vegans, as well as athletes in nearly every sport involving explosive efforts, are equally relevant users. |
| MYTH: “More advanced” forms of creatine (HCl, Kre-Alkalyn, buffered) are better than monohydrate. TRUTH: Creatine monohydrate remains the gold standard; the most cost-effective, most researched, and just as effective as all the “advanced” alternatives. No study has demonstrated the superiority of pricier formulations to a clinically meaningful degree. If anything sets HCl apart from monohydrate, it’s the price, and that favors monohydrate. [1] |
Who is it worth it for, and for whom is it not a priority?
Creatine has the strongest evidence for: athletes who perform explosive activities (sprints, weightlifting, contact sports, swimming, gymnastics), people who want to increase muscle mass and strength alongside resistance training, older adults who want to slow muscle loss and preserve functionality, vegetarians and vegans (who have lower baseline levels and therefore often a more pronounced response), and potentially people with depression who discuss it with their doctor. [1,3,9]
Creatine likely won’t bring a significant visible benefit for: people whose training mainly involves prolonged, low-intensity aerobic activities (marathon, long-distance hiking), people who already consume large amounts of meat every day (since their muscle stores are already closer to maximum), and “non-responders”; about 25–30% of the population who, due to genetically high baseline muscle creatine levels, don’t respond significantly to supplementation.
SUMMARY: WHAT WE KNOW WITH HIGH CONFIDENCE
- Creatine monohydrate increases strength and muscle mass alongside resistance training: the evidence is exceptionally strong and consistent [1,3,4]
- 3–5 g/day is a sufficient and safe dose; the loading phase is optional, not mandatory [1,10]
- The kidneys of healthy adults have no issues with recommended creatine doses; the myth is busted [11]
- The brain draws on the same creatine pool; the potential for cognitive benefit is real, but most pronounced in older adults and vegetarians [5,6]
- Women respond the same as men; especially useful in menopause and aging [1]
- Creatine monohydrate is the gold standard; cheaper, safer, and just as effective as all the “more advanced” forms [1]
- Consistency every day (including rest days) matters more than perfect timing [1]
Creatine is, in the fullest sense of the word, earned hype, but not because of marketing, rather because of the scope and consistency of the scientific evidence that supports it. At the same time, it is not a magic powder and not a solution without exercise. If you train and are considering supplementation, creatine monohydrate is the logical first step; cheap, safe, and better researched than almost any other supplement on the market. As always, talk to a doctor or nutritionist if you have specific health conditions.
Scientific references
[1] Kreider, Richard B., et al. “International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine.” Journal of the international society of sports nutrition 14.1 (2017): 18.
[2] Bonilla, Diego A., et al. “Metabolic basis of creatine in health and disease: a bioinformatics-assisted review.” Nutrients 13.4 (2021): 1238.
[3] Wu, Shih-Hao, et al. “Creatine supplementation for muscle growth: a scoping review of randomized clinical trials from 2012 to 2021.” Nutrients 14.6 (2022): 1255.
[4] Kazeminasab, Fatemeh, et al. “The effects of creatine supplementation on Upper-and lower-body strength and power: a systematic review and meta-analysis.” Nutrients 17.17 (2025): 2748.
[5] Xu, Chen, et al. “The effects of creatine supplementation on cognitive function in adults: a systematic review and meta-analysis.” Frontiers in nutrition 11 (2024): 1424972.
[6] Candow, Darren G., et al. ““Heads up” for creatine supplementation and its potential applications for brain health and function.” Sports Medicine 53.1 (2023): 49-65..
[7] Lyoo, In Kyoon, et al. “A randomized, double-blind placebo-controlled trial of oral creatine monohydrate augmentation for enhanced response to a selective serotonin reuptake inhibitor in women with major depressive disorder.” American Journal of Psychiatry 169.9 (2012): 937-945.
[8] Avgerinos, Konstantinos I., et al. “Effects of creatine supplementation on cognitive function of healthy individuals: A systematic review of randomized controlled trials.” Experimental gerontology 108 (2018): 166-173.
[9] Forbes, Scott C., et al. “Meta-analysis examining the importance of creatine ingestion strategies on lean tissue mass and strength in older adults.” Nutrients 13.6 (2021): 1912.
[10] Hultman, Eric, et al. “Muscle creatine loading in men.” Journal of applied physiology 81.1 (1996): 232-237.
[11] Naeini, Elham Kabiri, et al. “Effect of creatine supplementation on kidney function: a systematic review and meta-analysis.” BMC nephrology 26.1 (2025): 622.
[12] Wax, Benjamin, et al. “Creatine for exercise and sports performance, with recovery considerations for healthy populations.” Nutrients 13.6 (2021): 1915.
