Medically reviewed by Dr. Pamela Frank, BSc(Hons), ND
Creatine spent decades branded as a bodybuilding supplement, which is part of why so few women have used it and why the research on women specifically lagged behind. That’s changed. Here’s what the evidence actually supports, and a couple of places where popular claims have gotten ahead of the data.
What is Creatine?
Firstly, what is this product that you may have heard so much about?
Creatine is a naturally occurring compound made from three amino acids (arginine, glycine, and methionine). It is produced primarily in the liver and kidneys and stored mostly in skeletal muscle, with smaller amounts in the brain.
About half of the creatine your body uses comes from this internal production, and the rest comes from dietary sources, mainly meat and fish, which is why vegetarians and vegans tend to have lower baseline stores.
Inside muscle cells, creatine is stored as phosphocreatine, a rapid-access energy reserve that helps regenerate ATP, the molecule cells burn for fuel, during short bursts of intense effort. This is the mechanism behind this supplement’s most consistent, well-documented use: increasing the muscle’s phosphocreatine reserves supports greater capacity for high-intensity activity and, over time, contributes to gains in strength and muscle mass when combined with resistance training.
What Creatine Actually Does
Creatine is stored in muscle as phosphocreatine, where it helps regenerate ATP, the molecule your cells use for rapid energy. More stored phosphocreatine means more capacity for short, intense effort before fatigue sets in. Women naturally store 70 to 80% less than men, largely due to lower muscle mass and the effects of estrogen and progesterone on creatine kinase activity across the menstrual cycle, which is part of why supplementation may matter more for women than the “it’s just for bodybuilders” reputation suggests.1
Muscle and Strength in Women: The Well-Supported Part
This is where the evidence is most consistent. Combined with resistance training, creatine supplementation supports gains in muscle mass and strength across the female lifespan, including in postmenopausal women, where preserving muscle becomes increasingly important for metabolic health and fall prevention.1
Bone Health: Where the Popular Claims Outrun the Evidence
You’ll see creatine widely promoted for bone density, and it’s worth being direct about what the research actually shows, because this is a case where the marketing has moved faster than the data. An earlier one-year trial in postmenopausal women found that supplementation combined with resistance training preserved bone mineral density specifically at the femoral neck, compared to a decline in the placebo group. That finding fueled a lot of the current enthusiasm.
But the properly powered follow-up matters more. A 2023 two-year randomized controlled trial of 237 postmenopausal women, a much larger and longer study than the earlier one, found creatine had no effect on bone mineral density at the femoral neck, hip, or lumbar spine compared to placebo. It did find a modest benefit to certain bone geometry measures related to bending strength, and to walking speed, but not to grip or leg strength.2
The honest summary: the muscle and strength benefits in women are well supported. Its benefit for bone mineral density specifically is not, based on the best current evidence. If bone health is your primary concern, resistance training, adequate dietary calcium and supplemental vitamin D to optimize 25-hydroxyvitamin D blood levels, and standard bone density monitoring remain the better-supported priorities, with creatine as a reasonable adjunct for its muscle benefits rather than as a bone-building strategy on its own.
Mood and Cognitive Function: Promising, But Early
There’s growing interest in creatine’s role in brain energy metabolism, since neurons in your brain rely on the same phosphocreatine system that your muscle does.
One notable trial specifically in women with major depressive disorder found that adding the supplement to an SSRI improved depression response compared to the SSRI alone.3 This is a genuinely interesting finding, but it’s a single trial in a specific population (women, on a specific SSRI, with a clinical depression diagnosis), not a basis for treating creatine as a general mood supplement. Larger, independent replication is needed before this becomes a confident recommendation.
Other Common Claims: What Has Evidence, What Doesn’t
Creatine has picked up a long list of secondary claims beyond muscle, bone, and mood. Some hold up reasonably well. Others are getting ahead of what’s actually been shown.
Lowering Inflammation
This one has gone back and forth. Earlier narrative reviews suggested creatine had anti-inflammatory properties, largely based on studies of intense, short-duration exercise contexts (like reductions in inflammatory markers after triathlons or long-distance running).5 But the most rigorous evidence available, a 2026 systematic review and meta-analysis pooling eight randomized controlled trials, found no significant effect of taking it on CRP or IL-6, either acutely or with chronic use, across healthy individuals, athletes, and clinical populations.6
At this point, a general anti-inflammatory effect isn’t well supported.
Does It Need To Be “Fully Saturated” To Work?
No. The loading protocol (roughly 20 g/day for 5 to 7 days) exists to speed up how quickly muscle creatine stores reach saturation, not because saturation only happens that way. Taking 3 to 5 g/day consistently reaches essentially the same saturated muscle stores within about 3 to 4 weeks, and produces comparable increases in muscle creatine content and, over time, muscle size. Loading is a matter of convenience for athletes who want faster results, not a requirement for the supplement to work.
Increasing Fat Metabolism
There’s a real but modest effect here, and it’s tied to resistance training. A large 2024 meta-analysis of 143 studies found creatine supplementation produced small reductions in body fat percentage alongside increases in fat-free mass, with the effect more robust when combined with resistance training and a maintenance dosing protocol.7
This isn’t creatine acting as a fat burner on its own; it reflects a body composition shift where muscle gain outpaces fat, which is a meaningfully different mechanism than direct fat metabolism.
Attenuating Tumour Growth
This claim traces back to preclinical and mechanistic research, with cell and animal studies suggesting this supplement may influence cancer cell metabolism and tumour progression.5 Animal studies and cells in a dish do not always translate to results in humans.
This effect has not been established in human clinical trials, and it isn’t a basis for using creatine as a cancer-related intervention. This is a genuinely interesting area of early research, not a clinical claim to act on.
Does Creatine Supplementation Do Anything Without Resistance Training?
The evidence here is limited and inconsistent. A review specifically examining creatine supplementation without concurrent resistance training in aging adults found four studies showing a positive effect on muscle outcomes, three showing no effect, and one with mixed results.8 Creatine’s best-established benefits are tied to combining it with resistance training; without that stimulus, the evidence for meaningful muscle or strength benefit is much weaker and less consistent.
Helping Heart Failure
Evidence is preliminary and mixed. A randomized controlled trial in patients with heart failure found that six months of creatine supplementation did not significantly improve functional capacity on cardiopulmonary exercise testing, despite being well-tolerated.9
Other smaller trials have found short-term improvements in muscle strength or walking distance, but effects on cardiac function itself and longer-term symptom relief remain unclear. This is an area worth watching, not a supported treatment.
Protecting The Brain From Neurotoxicity
The underlying mechanism is plausible: your brain’s neurons rely on the same phosphocreatine energy system muscle does, and creatine has shown protective effects in preclinical models of brain injury and specific stress contexts (such as sleep deprivation). A comprehensive review of creatine and brain health found generally positive signals in these specific, targeted contexts.10
But this is a meaningfully different claim than “creatine protects the brain from neurotoxicity” as a general statement for healthy people, which the current evidence doesn’t support broadly. The research here is promising and actively developing, not yet a settled clinical recommendation.
Safety
Creatine monohydrate is one of the most researched supplements available. A comprehensive position stand from the International Society of Sports Nutrition concluded that short- and long-term supplementation, including doses well above what’s typically recommended, is safe and well-tolerated in healthy individuals, with no evidence of harm to kidney or liver function at standard doses.10
Now, one thing to point out about this document: If you scroll to the bottom of the PDF version, the authors of the paper have numerous “competing interests.” What that means is that almost all of them make money either directly or indirectly from creatine – speaking engagements about it, consulting with manufacturers who produce it, or working for supplement companies directly.
Two groups warrant extra caution with creatine supplements:
- Anyone with pre-existing kidney disease should discuss creatine with their physician before starting, since the research on safety in impaired kidney function is much more limited.
- For pregnancy and breastfeeding specifically, safety data in humans is still insufficient to make a general recommendation, even though creatine plays a documented role in fetal development; this is a discuss-with-your-practitioner situation, not a default yes or no.
Practical Dosing
The standard maintenance dose used across most of the research reviewed here is 3 to 5 grams of creatine monohydrate daily, taken consistently rather than only around workouts. A loading phase (around 20 grams per day for 5 to 7 days) speeds up how quickly muscle stores saturate, but isn’t necessary if you’re comfortable reaching full saturation over 3 to 4 weeks instead.
Creatine monohydrate specifically is the form with by far the most research behind it; other forms marketed as superior generally don’t have comparable evidence.
Frequently Asked Questions
Does creatine help with bone density in women?
The evidence here is mixed and, in the largest and longest trial available, negative for bone mineral density specifically. An earlier smaller trial found a benefit at the femoral neck, but a 2023 two-year trial in 237 postmenopausal women found no effect on bone density at the femoral neck, hip, or spine, though it did find some benefit to bone geometry and walking speed. Creatine’s strength case is well supported; its bone density case currently is not.
Is it safe for women to take long-term?
Current evidence supports creatine monohydrate as safe and well-tolerated at standard doses (3 to 5 g/day) in healthy individuals over both short and long-term use. People with pre-existing kidney disease or who are pregnant or breastfeeding should discuss it with their physician first, since safety data in that population are more limited.
Can creatine help with mood or depression?
There’s early, genuinely interesting evidence that creatine may enhance SSRI response in women with major depressive disorder, but this comes from a single trial and shouldn’t be treated as an established use. It’s a reasonable topic to discuss with your practitioner, not a general mood supplement recommendation at this point.
Is creatine safe during pregnancy?
Human safety data during pregnancy and breastfeeding is currently insufficient to make a general recommendation either way. This is worth a specific conversation with your practitioner rather than a default assumption.
References
- Smith-Ryan AE, Cabre HE, Eckerson JM, Candow DG. Creatine Supplementation in Women’s Health: A Lifespan Perspective. Nutrients. 2021 Mar 8;13(3):877. doi: 10.3390/nu13030877. PMID: 33800439; PMCID: PMC7998865.
- Chilibeck PD, Candow DG, Gordon JJ, Duff WRD, Mason R, Shaw K, Taylor-Gjevre R, Nair B, Zello GA. A 2-yr Randomized Controlled Trial on Creatine Supplementation during Exercise for Postmenopausal Bone Health. Med Sci Sports Exerc. 2023 Oct 1;55(10):1750-1760. doi: 10.1249/MSS.0000000000003202. Epub 2023 May 5. PMID: 37144634; PMCID: PMC10487398.
- Lyoo IK, Yoon S, Kim TS, Hwang J, Kim JE, Won W, Bae S, Renshaw PF. 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. Am J Psychiatry. 2012 Sep;169(9):937-945. doi: 10.1176/appi.ajp.2012.12010009. PMID: 22864465; PMCID: PMC4624319.
- Cordingley DM, Cornish SM, Candow DG. Anti-Inflammatory and Anti-Catabolic Effects of Creatine Supplementation: A Brief Review. Nutrients. 2022 Jan 27;14(3):544. doi: 10.3390/nu14030544. PMID: 35276903; PMCID: PMC8839648.
- de Camargo KMR, Bruna-Mejías A, Valenzuela-Fuenzalida JJ, Gonzaga LA, Barbalho SM, Barroca AL, Porto AA, Raimundo RD, de Abreu LC, Valenti VE. Impact of creatine supplementation on inflammation: evidence from a systematic review and meta-analysis of randomized double-blind placebo trials. Front Immunol. 2026 Feb 19;17:1743603. doi: 10.3389/fimmu.2026.1743603. Erratum in: Front Immunol. 2026 Apr 10;17:1840983. doi: 10.3389/fimmu.2026.1840983. PMID: 41798953; PMCID: PMC12961398.
- Pashayee-Khamene F, Heidari Z, Asbaghi O, Ashtary-Larky D, Goudarzi K, Forbes SC, Candow DG, Bagheri R, Ghanavati M, Dutheil F. Creatine supplementation protocols with or without training interventions on body composition: a GRADE-assessed systematic review and dose-response meta-analysis. J Int Soc Sports Nutr. 2024 Dec;21(1):2380058. doi: 10.1080/15502783.2024.2380058. Epub 2024 Jul 23. PMID: 39042054; PMCID: PMC11268231.
- Candow DG, Forbes SC, Chilibeck PD, Cornish SM, Antonio J, Kreider RB. Effectiveness of Creatine Supplementation on Aging Muscle and Bone: Focus on Falls Prevention and Inflammation. J Clin Med. 2019 Apr 11;8(4):488. doi: 10.3390/jcm8040488. PMID: 30978926; PMCID: PMC6518405.
- Carvalho AP, Rassi S, Fontana KE, Correa Kde S, Feitosa RH. Influence of creatine supplementation on the functional capacity of patients with heart failure. Arq Bras Cardiol. 2012 Jul;99(1):623-9. English, Portuguese. doi: 10.1590/s0066-782×2012005000056. Epub 2012 Jun 26. PMID: 22735863.
- Forbes SC, Cordingley DM, Cornish SM, Gualano B, Roschel H, Ostojic SM, Rawson ES, Roy BD, Prokopidis K, Giannos P, Candow DG. Effects of Creatine Supplementation on Brain Function and Health. Nutrients. 2022 Feb 22;14(5):921. doi: 10.3390/nu14050921. PMID: 35267907; PMCID: PMC8912287.
- Kreider RB, Kalman DS, Antonio J, Ziegenfuss TN, Wildman R, Collins R, Candow DG, Kleiner SM, Almada AL, Lopez HL. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. J Int Soc Sports Nutr. 2017 Jun 13;14:18. doi: 10.1186/s12970-017-0173-z. PMID: 28615996.
