A landmark 2025 study confirmed what we long suspected: creatine research spent three decades almost entirely ignoring women. Here’s what that gap cost us — and why it matters.
Imagine a drug studied in over 1,000 clinical trials — one of the safest, most consistently effective supplements ever discovered. Now imagine 30 years of that research was conducted almost exclusively on one half of the population, and the other half was handed the conclusions and told to act accordingly.
That’s not hypothetical. That’s creatine.
A landmark review published in May 2025 in the Journal of the International Society of Sports Nutrition — led by researchers at UNC Chapel Hill, Monash University, and the Hudson Institute of Medical Research — just put it in writing. Women’s physiology was largely excluded from the foundational creatine research that shaped three decades of supplement guidance.
The fallout isn’t abstract. The researchers describe real, measurable consequences for women’s muscle health, reproductive health, brain function, mood, and bone density — all shaped by creatine metabolism in ways that differ fundamentally from men.
30+ YEARS OF CREATINE RESEARCH…conducted primarily on male subjects. Women-specific research only meaningfully began in the 2010s.
How It Happened
This was not malice — it was the product of deeply embedded research norms that assumed male biology was the default. But the consequences are the same regardless of intent.
’90s
Creatine explodes as a performance supplement. Studies establish it works for high-intensity output, muscle mass, and strength. Almost all research subjects: men. The dosing and loading protocols now used globally come from this era.
2000s
A handful of studies include women — but without controlling for the menstrual cycle, pregnancy status, or contraceptive use. Hormonal variation is treated as noise, not signal. Conclusions are averaged with male data and generalized.
2010s
The first women-focused reviews appear. Researchers start questioning whether hormone-driven changes to creatine metabolism are being accounted for. They aren’t. The 2016 Ellery et al. review is among the first to propose creatine as a specifically important nutrient during pregnancy.
2021
Smith-Ryan et al. publish the first comprehensive lifespan review for women specifically. They confirm creatine has real performance and health benefits for women — but flag that dosing, timing, and hormonal context remain understudied.
2025
The research gap is formally named. A new review confirms that women have lower creatine synthesis, lower dietary intake, and hormonal fluctuations that directly alter creatine metabolism — none of which was reflected in the research that built supplement culture.
Why Women’s Creatine Biology Is Not a Minor Footnote
Here’s the part that should make you pause. This wasn’t a situation where men and women metabolize creatine the same way and researchers just happened to study men. The physiological differences are significant — and they weren’t accounted for.
20% Lower creatine synthesis in women vs. men
30–40% Less dietary creatine consumed by women on average
70–80% Lower total creatine stores in women’s muscles
And those are just the baseline gaps. Then add the menstrual cycle, which causes creatine kinase activity — the enzyme that drives creatine’s energy function — to fluctuate across the month, tracking with estrogen levels. Add pregnancy, which creates dramatically elevated creatine demands for the placenta and developing fetus. Add perimenopause, where falling estrogen accelerates both muscle loss and creatine metabolism disruption simultaneously.
At every stage, women’s creatine story is different from men’s. The research that was supposed to guide us pretended otherwise.
“Males and females store, metabolize and use creatine differently, while also highlighting the need for larger more longitudinal evaluations of creatine for women.”
— Ellery et al., foundational 2016 review, cited in Smith-Ryan et al. 2025
What the Gap Actually Meant for Women
The 2025 review makes clear that inadequate creatine isn’t just a gym problem. Population data cited in the paper found that women consuming insufficient dietary creatine faced a measurably higher risk of irregular periods, pelvic infections, hysterectomy, and oophorectomy. That’s not a performance metric. That’s reproductive health.
Meanwhile, the brain: women are twice as likely as men to experience depression. Research now links this, at least in part, to the same hormonal milestones that disrupt creatine metabolism — puberty, the luteal phase, postpartum, and perimenopause. Emerging clinical data suggests creatine supplementation may support mood and cognitive function in women precisely during these vulnerable windows.
And post-menopause: falling estrogen accelerates muscle and bone loss. Creatine supplementation — particularly paired with resistance training — has now shown meaningful benefits for skeletal muscle mass, strength, and bone density markers in post-menopausal women.
BRAIN & MOOD
Creatine supports brain ATP levels. Depression rates in women track with creatine-disrupting hormonal events — a connection researchers are only now mapping.
BONE DENSITY
Post-menopausal women on creatine + resistance training show reduced bone breakdown markers and improved bone-building cell activity.
PREGNANCY
Creatine was first proposed as “an essential dietary metabolite of pregnancy” in 2016. Human trials are only just beginning.
MENSTRUAL CYCLE
Creatine kinase activity tracks with estrogen through the month. Studies only recently began accounting for cycle phase.
“Women are the largest consumers of dietary supplements in the U.S. — yet the research that built the creatine supplement industry was done almost entirely on men.”
So What Do You Actually Do With This?
The 2025 review doesn’t just diagnose the gap — it establishes what we now know. The evidence consistently supports creatine supplementation for women at most life stages.
The risk-to-benefit ratio, in the researchers’ own words, “appears to provide more benefit and potential benefit, compared to risks.”
01 In your reproductive years: 3–5 g of creatine monohydrate daily. Particularly useful during the luteal phase (days 15–28 of your cycle) when energy typically dips and creatine kinase activity shifts.
02 Approaching or in menopause: Research supports higher doses (~0.3 g/kg body weight/day), especially paired with resistance training. This is where the bone and muscle evidence is strongest.
03 Pregnant or postpartum: Human research is still emerging. Consult your healthcare provider. Early animal model evidence is promising, but this remains one of the biggest gaps named by the 2025 review.
04 For brain health and mood: 5 g/day consistently. Early findings in sleep deprivation and depression contexts are genuinely encouraging.
05 On form: No loading phase required. Any time of day works. Creatine monohydrate powder is the standard — avoid gummies, which often contain added sugars and lower effective doses.
This Is Bigger Than One Supplement
The creatine research gap is a case study in what happens when women are treated as afterthoughts in nutrition science. It’s not the only example — it’s one of the most visible ones, because creatine has the benefit of such a large research base that the gaps are now measurable and documentable.
Women don’t need to wait for perfect research to make informed choices. The science that exists — compiled, for the first time comprehensively, for women — is enough to start a conversation with your doctor, and potentially enough to start a new supplement routine.
You were never the afterthought the research made you. The science is just catching up. Start with the Right Foundation Quality-tested creatine monohydrate built around what the science actually says.
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SCIENTIFIC SOURCES
1. Smith-Ryan AE, et al. “Creatine in women’s health: bridging the gap from menstruation through pregnancy to menopause.” J
Int Soc Sports Nutr. 2025;22(1):2502094. PMC12086928
2. Smith-Ryan AE, et al. “Creatine Supplementation in Women’s Health: A Lifespan Perspective.” Nutrients. 2021;13(3):877.
3. Ellery SJ, et al. “Creatine for women: a review of the relationship between creatine and the reproductive cycle.” Amino Acids.
FAQ
Is creatine good for women?
Yes. New research suggests creatine may support women’s muscle health, strength, energy production, brain function, mood, and healthy ageing, although needs can differ across menstruation, pregnancy, and menopause.
Why is creatine different for women?
Women generally have lower creatine stores, lower dietary intake, and hormone-related changes that may affect creatine metabolism differently than men.
Can women take creatine every day?
The article indicates that daily creatine monohydrate is commonly supported by current evidence, with typical intake often discussed around 3 to 5 grams per day depending on life stage and context.
Does creatine help with women’s brain health and mood?
Emerging evidence suggests creatine may help support brain energy, mood, and cognitive function, particularly during hormonally demanding periods.
Is creatine useful during menopause?
Research highlighted in the article suggests creatine, especially when paired with resistance training, may support muscle mass, strength, and bone-related markers in post-menopausal women.
Should pregnant women take creatine?
The article notes that research is still emerging and that women who are pregnant or postpartum should speak with a healthcare provider before supplementing.
