Creatine monohydrate is the most studied and best-supported supplement for strength and muscle, though the amount it adds is small. Paired with resistance training it adds strength and lean muscle beyond what training builds on its own, in young athletes and in adults in their sixties and seventies. It helps older people keep muscle they would otherwise lose with age, and possibly bone. Newer research shows a memory benefit concentrated in older adults.
One early trial found sharper thinking through a night of lost sleep. It costs a few cents a day, has one of the longest safety records of any supplement, and needs no loading week to work. The common fears, that it harms the kidneys or leaves you bloated, are not borne out by the controlled research.
Findings & Outcomes
What It Is
Creatine is a compound the body makes in the liver and kidneys and stores mostly in muscle, where it holds a fast energy reserve called phosphocreatine. The diet adds more, mainly from red meat and fish, at roughly a gram or two a day in a typical mixed diet. Production and food together keep the store most of the way full; a daily supplement fills the rest, and the fuller reserve is what improves performance.
What It Does
Creatine adds strength and lean muscle, though only when you train alongside it. Pooled across many randomized trials, the gain per study is small but consistent, largest in short, hard efforts and upper-body lifts. The clearest results are in older adults. They gain about an extra 3.1 lb (1.4 kg) of lean mass, plus the strength that comes with it, set against the muscle otherwise lost with age.
Newer findings sit at an earlier stage. A memory benefit shows up, concentrated in older adults and close to nothing in rested young people. In one trial, a single large dose sharpened thinking through a night without sleep. Aging bone may gain too, mostly through the muscle and strength built around it, while trials that measure bone density directly stay mixed.
The Research & Studies
Everything here is based on the research we have collected and checked, sorted into groups and ordered with the strongest evidence first. Click any claim to open the studies behind it.
Muscle And Strength
Creatine plus training beat training alone across 100 trials, effect size about 0.24 for short, hard efforts
Adding creatine to training builds a bit more muscle and strength than training alone. The extra is modest and reliable, and it shows up most in short, hard efforts and upper-body lifts.
A meta-analysis pooling 100 placebo-controlled studies (Branch 2003) found small but statistically significant effect sizes for creatine over placebo: body composition 0.17, tasks lasting under 30 seconds (the phosphocreatine system) 0.24, and larger effects for repeated-bout (0.25) and upper-body exercise (0.42) than for single-bout or lower-body work. The gains are consistent and repeatable across a large literature; they are not large per study.
The study · 1
Branch 2003, Int J Sport Nutr Exerc Metab · Int J Sport Nutr Exerc Metab
Adults aged 57 to 70 gained about 3.1 lb (1.4 kg) more lean mass with creatine plus training, across 22 trials
In people in their late fifties to seventies, creatine added to resistance training builds about 3.1 lb (1.4 kg) more lean mass and meaningfully more upper- and lower-body strength than the same training with a placebo.
A systematic review and meta-analysis of 22 randomized controlled trials in 721 older adults (mean age 57 to 70, men and women), all doing supervised resistance training 2 to 3 days a week for 7 to 52 weeks, found creatine produced greater increases than placebo in lean tissue mass (mean difference 3.0 lb (1.37 kg), 95% CI 0.97 to 1.76), chest press strength (SMD 0.35, 95% CI 0.16 to 0.53) and leg press strength (SMD 0.24, 95% CI 0.05 to 0.43). This is the clearest modern application of creatine: countering the muscle and strength loss of aging when paired with training.
The study · 1
Chilibeck 2017, Open Access J Sports Med · Open Access J Sports Med
Skipping the loading phase reached the same muscle creatine in about a month
You do not need the classic loading week. Taking a low daily dose reaches the same muscle stores and the same results; loading just gets there faster.
A meta-analysis of creatine ingestion strategies during resistance training in older adults (Forbes 2021) found creatine augmented lean tissue mass versus placebo independent of dosing strategy, including lower daily doses (5 g/day or less) without a loading phase and even when taken only on training days; for strength, the added benefit over placebo was not significant once loading-phase studies were excluded. The end point of muscle creatine saturation is reached either way; loading (about 20 g/day for 5 to 7 days) reaches it in roughly a week, not three to four.
The studies · 2
Forbes et al. 2021, Nutrients (ingestion strategies meta-analysis) · Nutrients
Antonio 2021, J Int Soc Sports Nutr · J Int Soc Sports Nutr
Counts once: this finding and 1 other here come from the same source, so they are one body of evidence, not separate confirmations.
The pricier forms did not outperform plain monohydrate, the form nearly every trial used
Plain creatine monohydrate is what nearly all the research used. The fancier, more expensive forms sold as better absorbed have not beaten it.
Both the ISSN position stand (Kreider 2017) and the common-questions review (Antonio 2021) address supplement form directly and conclude that creatine monohydrate is the reference form with the strongest evidence, and that alternative forms (hydrochloride, buffered, ethyl ester and others) marketed as superior have not demonstrated greater efficacy in the research. Micronized monohydrate is the same compound milled finer for better mixing, not a different result.
The studies · 2
Kreider 2017, J Int Soc Sports Nutr (ISSN position stand) · J Int Soc Sports Nutr
Antonio 2021, J Int Soc Sports Nutr · J Int Soc Sports Nutr
Counts once: this finding and 1 other here come from the same source, so they are one body of evidence, not separate confirmations.
Older women gained upper-body strength with creatine across 10 trials, and lower body too past 24 weeks
Older women who added creatine to resistance training gained strength, clearest in the upper body, and in the upper and lower body once the program lasted at least 24 weeks.
A systematic review and meta-analysis of 10 randomized controlled trials in 211 older women (Dos Santos and colleagues, 2021) found creatine combined with resistance training significantly increased upper-body strength (7 studies, n=142, p=0.04) versus training alone. In the subset of trials lasting 24 weeks or more, both upper-body (p=0.05) and lower-body (p=0.03) strength improved. No significant effect on muscle mass was detected in this female-only pooled analysis. Women were underrepresented in earlier creatine research, and this analysis pools the trials done in women.
Who this may not transfer to:Men are well studied separately, where strength and lean-mass effects are at least as large.
The study · 1
Dos Santos et al. 2021, Nutrients (older females meta-analysis) · Nutrients
Cognition
Memory improved in adults aged 66 to 76 (effect size 0.88) and essentially not at all in the young (0.03)
Creatine gave a small overall bump to memory in healthy people. The benefit was clear in older adults in their late sixties and seventies, and essentially nothing in young adults.
A systematic review and meta-analysis of randomized controlled trials (Prokopidis 2023) pooled 8 RCTs and found creatine improved memory versus placebo overall (SMD 0.29, 95% CI 0.04 to 0.53). Subgroup analysis showed a substantial effect in older adults aged 66 to 76 (SMD 0.88, 95% CI 0.22 to 1.55) and no effect in younger people aged 11 to 31 (SMD 0.03, 95% CI -0.14 to 0.20). Dose (about 2.2 to 20 g/day), duration (5 days to 24 weeks) and sex did not change the finding. Heterogeneity was high, and the brain benefit is concentrated in the older subgroup, where baseline stores or demand differ.
The studies · 2
Prokopidis 2023, Nutr Rev · Nutr Rev
Forbes 2022, Nutrients (brain function review) · Nutrients
A single 0.35 g/kg dose sharpened thinking through 21 hours of sleep deprivation in one trial
In one study, a single large dose of creatine helped people think faster and more accurately while kept awake for most of a day, alongside measurable changes in the brain's energy chemistry.
A placebo-controlled crossover trial (Gordji-Nejad 2024, Scientific Reports) gave a single high oral dose of creatine monohydrate (0.35 g/kg) during roughly 21 hours of sleep deprivation, with brain phosphorus-MRS scans and cognitive tests at baseline and at 3, 5.5 and 7.5 hours. Creatine improved cognitive performance and processing speed, prevented a fall in brain pH, and changed high-energy phosphate markers (PCr/Pi, ATP). The result suggests a single large dose can temporarily raise brain creatine uptake, which usually requires weeks of daily dosing.
The study · 1
Gordji-Nejad 2024, Sci Rep · Sci Rep
Bone Density
Creatine plus training moved some bone-turnover markers, while direct bone-density trials stayed mixed
Creatine combined with strength training may help aging bone, and it clearly helps the muscle around it. The direct evidence on bone density itself is not settled.
A narrative review focused on older adults (Candow 2022, Bone) concludes that creatine monohydrate, primarily when combined with resistance training, has favorable effects on indices of aging muscle and bone, including some bone turnover markers, which provides rationale for its use against sarcopenia, osteoporosis, frailty and cachexia. The muscle and strength evidence is strong; the bone-mineral-density trial results are inconsistent and the bone case remains a reasoned extension, not a settled outcome.
The study · 1
How It Works
A working muscle spends ATP, its immediate fuel, faster than it can rebuild it from scratch. Phosphocreatine refills ATP in the first seconds of hard effort, the opening heavy reps of a set or the start of a sprint. Supplementing raises how much phosphocreatine the muscle holds, so it can do slightly more total work before fatigue. That extra work, session after session, turns into strength and lean mass. A small amount of water also moves into the muscle cell, adding a little early size.
The brain runs on the same phosphocreatine buffer and is metabolically demanding. When brain energy is under strain, from sleep loss or older age, a fuller buffer may help. That is what the cognition trials test. The brain takes creatine up more slowly than muscle, so the brain findings need longer dosing, or in the sleep-deprivation study, one very large dose.
Ways to Do It
The whole protocol comes down to a few grams a day of the plain form, taken consistently. There is no loading week and no timing window.
This is the whole dose. Three to five grams daily, or about 0.1 gram per kilogram of body weight, saturates the muscle store within three to four weeks and holds it there. The creatine calculator sizes the dose to your weight. A rounded teaspoon stirred into water, coffee or a shake works. The everyday dose sits far below the amounts studied for safety, where up to 30 grams a day was well tolerated, so it has a wide margin. Consistency matters more than any of the fine points.
The classic loading phase, roughly 20 grams a day split into four doses for five to seven days, fills the store in about a week instead of a month. The end point is identical. The large single doses cause stomach upset in some people, so the steady 3 to 5 grams reaches full saturation more comfortably.
Because saturation builds over weeks, the time of day barely changes the result. Take it whenever you will remember, with a meal if that helps. The daily total is what counts.
Nearly every study used creatine monohydrate. The alternatives sold as better absorbed or gentler, such as hydrochloride, buffered or ethyl ester, have not beaten it in head-to-head research. Micronized monohydrate mixes better, the same compound in a finer powder.
Unflavored micronized creatine monohydrate from any brand carrying an independent testing mark, such as NSF Certified for Sport or Informed Sport, is the practical buy. The mark tells you the tub holds what the label says, and it matters most for anyone subject to drug testing in sport.
Go Deeper
- Resistance training: the training every strong creatine result rests on, and the intervention with the strongest evidence for building strength and muscle; creatine adds a little.
- Protein and muscle: the raw material that training builds from.
- Balance and falls: for older readers working to hold muscle and stay steady on their feet.
- Strength and muscle: the broader goal this all serves.
Cautions For This Practice
Everything to be aware of is here, in one place. This practice suits most healthy people; a few situations call for real care.
Up to 30 grams a day for as long as 5 years was well tolerated, from infants to the elderly
The International Society of Sports Nutrition position stand (Kreider 2017) concludes, from a large evidence base, that short- and long-term creatine supplementation (up to 30 g/day for up to 5 years) is safe and well-tolerated in healthy individuals and in patient populations ranging from infants to the elderly. It also notes habitual low dietary intake (about 3 g/day) may carry broader health benefits across the lifespan. The everyday maintenance dose of 3 to 5 g/day sits far below the highest amounts studied.Kreider 2017, J Int Soc Sports Nutr (ISSN position stand)
Creatine did not harm kidney function in healthy people, though it raises the creatinine reading
Creatine is spontaneously converted in the body into creatinine, the waste product a standard blood test uses to estimate kidney function, so supplementation can raise serum creatinine without indicating dysfunction. A narrative review of the evidence (Longobardi 2023, Nutrients) concludes that despite isolated case reports and animal studies, controlled clinical trials assessing kidney function with reliable methods show creatine is safe for human consumption. The Kreider position stand and the Antonio common-questions review reach the same conclusion. Studies in people with pre-existing kidney disease remain necessary.Longobardi 2023, Nutrients (kidney narrative review)Kreider 2017, J Int Soc Sports Nutr (ISSN position stand)Antonio 2021, J Int Soc Sports Nutr
The steroid, kidney, hair-loss, dehydration and cramp worries did not hold up in controlled research
An evidence-based review by an international expert panel (Antonio 2021, J Int Soc Sports Nutr) worked through the common questions and misconceptions about creatine. Its conclusions: creatine is not an anabolic steroid, does not cause kidney damage in healthy people, is not shown to cause hair loss (the concern rests on a single unreplicated study of a hormone marker), and does not cause dehydration or muscle cramping. Recommended dosing is 3 to 5 g/day or 0.1 g/kg/day, and it is well tolerated at those amounts.Antonio 2021, J Int Soc Sports Nutr
Large single doses like the 20-gram loading days caused stomach upset that splitting the dose settled
The common-questions review (Antonio 2021) and the ISSN position stand (Kreider 2017) note that gastrointestinal complaints from creatine are dose-related, clustering around large single servings such as the 20 g/day loading protocol, not the maintenance dose. The practical response is to split the dose across the day or use the steady 3 to 5 g/day, taken with food, which is well tolerated by most people.Antonio 2021, J Int Soc Sports NutrKreider 2017, J Int Soc Sports Nutr (ISSN position stand)
The early weight gain was water drawn into muscle, not fat
The common-questions review (Antonio 2021) addresses the water-retention concern directly: creatine increases intracellular water within muscle, which accounts for the small early rise on the scale. It does not increase fat mass. Longer-term increases in body mass reflect gains in lean tissue from training, not continued water retention. This is a clarification of what the weight change is, not a benefit or a harm.Antonio 2021, J Int Soc Sports Nutr
If you have kidney disease, check with your doctor first
The reassuring kidney research is in healthy people. Creatine has been studied little in people with existing kidney disease. If you have reduced kidney function, are on dialysis, or take a drug that affects the kidneys, raise it with your doctor before starting.
Creatine raises a kidney blood-test number
Creatine is converted in the body into creatinine, the waste product a standard blood test uses to estimate kidney function. Taking creatine can nudge that number up while the kidneys work normally, and a doctor who does not know you supplement may read it as a problem. Tell whoever orders the test that you take creatine, or ask for a cystatin C measure, which creatine does not affect.
Early scale weight is water in the muscle
The water sits inside the muscle cell, not under the skin, and none of it is fat. Any lasting gain after the first weeks is the muscle you build by training.
If loading upsets your stomach, split the dose
If the loading days give you bloating or loose stools, split them into smaller servings. Dropping to 3 to 5 grams a day with food settles it for most people.
Pregnancy, breastfeeding, and children are not well studied
The safety data come from trials in adults and in studied patient groups. Creatine has not been studied enough in pregnancy or breastfeeding, or in healthy children and teenagers using it for sport. Check with a doctor before starting in any of those cases.
Start slow, be smart, read the research, and consult a professional if you have any concerns. This is here to inform your choice, not make it for you.
Common Questions
Does creatine damage your kidneys?
In healthy people, controlled trials say no. When kidney function is tracked with reliable measures, it stays in the normal range on creatine. Existing kidney disease is the open question.
In healthy people, controlled trials say no. When kidney function is tracked with reliable measures, it stays in the normal range on creatine.
Does creatine cause hair loss?
The worry traces to one small study that saw a rise in DHT, a hormone tied to male-pattern baldness. That study never measured hair. No study since has reproduced the DHT rise or shown creatine causing hair loss.
Does creatine work for women?
Yes. Women were underrepresented in early research, so the women-specific evidence arrived later, though it points the same way it does in men. Older women who add creatine to resistance training gain strength, clearest in the upper body, and in programs of 24 weeks or longer in the lower body as well.
Explore Related
Other pages this one connects to, by the evidence they share, the outcomes they touch, and the ground they cover.
All 19 sources on this page independently checked and cross-referenced.
Thomas Dehli, Founder & Editor, Sacred Lotus
Sacred Lotus has published Chinese medicine reference material since 2001. Integrative pages are held to the same standard as the herb and formula library: cite the source, grade the claim at its real strength, and say where the research has not looked. This page is educational and it is not medical advice. Last reviewed and updated August 9, 2026.
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