Creatine is having a moment with women, and if you’re pregnant or trying to be, you’ve probably wondered whether you should stop taking it, start taking it, or ignore the whole conversation. Here’s the honest short answer up front: there is real, serious science on creatine and pregnancy, almost all of it encouraging, and none of it yet strong enough to tell you what to do. The animal data is genuinely impressive. The human data consists of one metabolism study, one tiny dosing trial, and zero trials measuring whether supplementing actually changes outcomes for mothers or babies. If you take nothing else from this article, take that distinction, because most of what you’ll read elsewhere blurs it.
I’ve been following this literature for years, and creatine in pregnancy is one of the more interesting stories in the whole field. It’s being driven not by supplement companies but by obstetric researchers, mostly one determined group in Australia, who think creatine might one day matter for the roughly one to three babies in every thousand who experience oxygen deprivation around birth. That’s a hypothesis under investigation, not a proven benefit, and this article will keep those two things apart. Talk to your obstetrician before taking any supplement in pregnancy, including this one. What follows is the background you’ll want for that conversation.
What Creatine Is and Why Anyone Studies It in Pregnancy
Creatine is a small compound your body makes from three amino acids, arginine, glycine and methionine, and also absorbs from food, mainly red meat and fish. Its job is energy buffering. Cells store creatine as phosphocreatine, a rapid reserve that regenerates ATP, the molecule cells spend when they do work. Tissues with high and fluctuating energy demands, skeletal muscle, the heart, and the brain, keep the largest stores.
That energy buffering role is exactly why pregnancy researchers got interested. Pregnancy is a state of elevated metabolic demand, and birth itself can involve brief periods where oxygen supply to the baby falls short. When oxygen runs low, cells lean on phosphocreatine to keep ATP available. A 2014 review in BMC Pregnancy and Childbirth by Dickinson and colleagues laid out this logic in detail, summarizing the experimental case that a fetus with fuller creatine stores might weather a period of low oxygen with less cellular damage. The review also noted creatine’s other relevant properties from laboratory work, including antioxidant actions and membrane stabilization.
One more piece of context matters. The teams doing this work have raised the question of whether creatine behaves like a conditionally important nutrient in pregnancy, meaning the body’s own synthesis plus a typical diet may or may not cover the demands of growing a baby, depending on the person. That question is open. It has not been answered, and no health authority currently treats creatine as a required nutrient in pregnancy.
What Happens to Creatine Metabolism When You’re Pregnant
For a long time nobody had actually measured how creatine behaves across a human pregnancy. That changed with the Creatine and Pregnancy Outcomes study, a prospective cohort of women with low risk singleton pregnancies at an Australian health service, published by de Guingand and colleagues in the American Journal of Clinical Nutrition in 2024. The researchers sampled maternal blood and urine at five points from 10 to 36 weeks of gestation and collected cord blood and placental tissue at birth.
Two findings stand out. First, maternal plasma creatine concentrations stayed remarkably stable across pregnancy, while markers of the body’s own creatine production shifted, with urinary guanidinoacetate, the intermediate compound the body converts into creatine, rising over gestation. The authors read this as creatine metabolism adjusting to pregnancy rather than passively drifting. Second, how much animal protein a woman ate correlated with her plasma creatine levels until around 32 weeks, which fits what you’d expect given that meat and fish are the main dietary sources.
Now the inconvenient part, which this study deserves credit for reporting plainly. Creatine concentrations in maternal plasma, urine, placenta, and cord blood showed no association with birthweight, birth length, or head circumference. If maternal creatine status straightforwardly drove fetal growth in healthy pregnancies, you’d expect at least a signal here, and there wasn’t one. The study did find that higher urinary guanidinoacetate in early pregnancy was associated with a very slightly smaller head circumference at birth, a reduction of about 0.01 cm per unit of excretion, which is a statistical whisper worth follow up rather than a finding worth worrying about. The honest summary is that this study taught us how creatine metabolism behaves in pregnancy and gave no evidence that more creatine means bigger or healthier term babies.
There’s separate work suggesting the placenta itself handles creatine actively, with the same research group reporting altered placental creatine metabolism in pregnancies complicated by poor placental function and reduced fetal growth. Those are observational findings in complicated pregnancies. They generate hypotheses about where creatine might matter, and nothing more yet.
The Animal Studies That Started All This
The reason anyone is running human trials at all is a series of animal experiments, mostly from Monash University and the Hudson Institute, that produced results striking enough to justify the effort.
The signature model is the spiny mouse, a rodent whose pups are born unusually mature, making its late pregnancy a better stand in for human gestation than the ordinary lab mouse. In a 2008 study in the American Journal of Obstetrics and Gynecology, Ireland and colleagues fed pregnant spiny mice a diet supplemented with creatine at 5 percent by weight from the middle of gestation. The supplement raised creatine content in the placenta and in the fetal brain, heart, liver and kidney, and when the researchers induced roughly eight minutes of oxygen deprivation at birth, pups from supplemented mothers were more likely to survive and grew better afterward.
A follow up study by the same group, published in Neuroscience in 2011, looked at the newborn brain 24 hours after that birth hypoxia. In pups from mothers on the normal diet, hypoxia drove up lipid peroxidation, a marker of oxidative damage, along with several proteins involved in programmed cell death. In pups from creatine supplemented mothers, those increases were almost completely prevented. Parallel studies found protection in other organs too, including the diaphragm, where a 2016 paper in PLOS ONE reported that the muscle weakness and structural changes caused by birth asphyxia persisted to postnatal day 33 in unsupplemented animals but did not appear in animals whose mothers received creatine.
These are well conducted studies and the effects are consistent across organs. They are also exactly the kind of results that get inflated on the way from journal to Instagram, so keep three limits in view. The dose was enormous, a 5 percent creatine diet, far beyond anything a human supplement protocol would deliver relative to body size. The injury was severe, deliberate, experimentally timed oxygen deprivation, which is not a feature of a normal healthy birth. And rodents are rodents. This body of work supports testing creatine in high risk human pregnancy. It does not show that creatine helps a healthy human pregnancy, and no one involved in the research claims it does.
The Findings That Complicate the Story
A site like this exists to report the results that don’t fit the tidy narrative, and creatine in pregnancy has a few.
The most important comes from sheep. A 2023 fetal sheep study from Tran and colleagues examined creatine levels across brain regions after direct fetal creatine infusion and acute global hypoxia. Alongside the expected protective signals, the authors explicitly flagged potentially adverse neurodevelopmental effects of increased creatine exposure in the womb, pointing among other things to increased myelin in white matter tracts of supplemented fetal sheep in related work. More myelin sounds like a good thing until you remember that brain development runs on a schedule, and accelerating or altering that schedule is not automatically benign. The same paper noted the reassurance available from the other direction, including spiny mouse studies by LaRosa in 2016 and Ellery in 2017 that followed offspring of creatine supplemented pregnancies to sexual maturity and found no developmental differences from controls.
A 2025 study in Developmental Neuroscience extended that behavioral question, following spiny mice born after maternal creatine supplementation, with or without birth asphyxia, and examining their behavior long term. The researchers framed the study around precisely the concern above, that changes like increased myelination or the heightened hippocampal excitability reported in rat offspring of supplemented mothers could influence learning, memory and behavior in ways nobody has fully mapped.
None of this amounts to evidence of harm. It amounts to evidence that flooding a developing brain with extra creatine is a real physiological intervention with effects we don’t fully understand, which is exactly why the human work is proceeding through careful safety and dosing studies rather than jumping straight to outcome trials. When someone tells you animal research shows creatine in pregnancy is purely protective, they’ve read the abstracts and skipped the discussion sections.
The Newest Safety Data: A Full Term Guinea Pig Pregnancy
Because the dramatic spiny mouse results all involved an induced injury, an obvious question remained. What does maternal creatine do to a normal, uncomplicated pregnancy? A 2025 guinea pig study by Freeman and colleagues in the Journal of the International Society of Sports Nutrition addressed exactly that, and guinea pigs, like spiny mice, deliver relatively mature young, which is why perinatal researchers like them.
From day 21 of gestation, with term around day 69, 27 pregnant guinea pigs received oral creatine monohydrate at 0.3 g per kg per day while 29 received water. The results were a long list of nothing, which in a safety study is the point. Creatine had no significant effect on gestational weight gain, fetal growth measured by repeat ultrasound, umbilical or middle cerebral artery blood flow, birthweight, pregnancy length, or stillbirth rate. Offspring glucose tolerance at three weeks of age and body composition at four weeks were also unaffected. The authors concluded the data support maternal creatine supplementation as safe in healthy term pregnancy and as a foundation for human studies.
That’s genuinely reassuring, with the standard caveat that it’s one animal study with a few dozen animals per group. It tells us a sensible oral dose didn’t disturb a healthy guinea pig pregnancy. It cannot tell us about rare harms, human specific effects, or anything about benefit.
What Human Research Actually Exists
Here is the complete human interventional evidence on creatine supplementation in pregnancy as of late 2026, and I mean complete. It is one dosing study.
The open label dose escalation trial by Naidu, de Guingand, Ellery, Palmer and colleagues, published in 2025, was a pharmacokinetic study, meaning it measured how the body absorbs and clears creatine rather than whether creatine improves any outcome. In the first stage, a single 5 g dose of creatine monohydrate went to eight nonpregnant women and seven women in the third trimester, with blood sampled over ten hours. Peak concentrations and timing were comparable between groups, which tells us third trimester pregnancy doesn’t meaningfully change how creatine is handled. Modeling then predicted that 5 g taken three to four times daily would reach a steady plasma concentration of about 50 mg per liter within 72 hours. In the second stage, eight pregnant women took 5 g every eight hours for three days, with fetal monitoring throughout, and participants reported no major adverse events or side effects.
I want to be precise about what this study is, because it’s already being waved around online as proof that creatine is safe in pregnancy. It’s a well designed first step involving fifteen pregnant women in total, open label, lasting days not months, in the third trimester only, and measuring blood levels and tolerability, not birth outcomes, not development, not anything downstream. Fifteen women over three days cannot establish safety across pregnancy, and the investigators themselves describe this as groundwork for the trials that could.
Beyond that, the human file contains the observational cohort described earlier, which involved no supplementation, and a body of safety data from women who were not pregnant. On that last point, a 2020 systematic review and meta analysis in Nutrients by de Guingand and colleagues pulled together every study using creatine as the primary intervention in females. Out of 656 creatine studies identified, only 58, about 9 percent, were conducted exclusively in women, which tells you something embarrassing about the field. Among 29 studies that monitored adverse outcomes, covering 951 participants, there were no deaths and no serious adverse events, and no statistically significant increase in total adverse events, gastrointestinal complaints, weight gain, or markers of kidney or liver function. Solid, reassuring, and drawn entirely from nonpregnant women.
So Is Creatine Safe During Pregnancy or Not
The maddening but truthful answer is that nobody can currently say, and anyone who tells you flatly yes or flatly no is going beyond the evidence in one direction or the other.
The case for cautious optimism rests on converging pieces. Creatine is a normal component of the body and the pregnant body specifically, present in the placenta, cord blood, and breast milk. Decades of research in nonpregnant adults, summarized in the International Society of Sports Nutrition position stand, found supplementation well tolerated across doses and durations, including long term use. The female specific safety review found nothing alarming. The guinea pig pregnancy study found nothing alarming. The small human dosing trial found nothing alarming.
The case for caution is equally simple. Absence of alarm in small, short studies is not the same as demonstrated safety, especially in pregnancy, where rare or delayed effects are exactly the kind that small studies miss. A 2025 review of creatine safety concerns by Kreider and colleagues, generally a very pro creatine document, still specifically advises caution for pregnant women because the evidence is lacking, alongside people with preexisting kidney conditions. And US obstetricians largely echo that. When journalists ask, the typical answer from practicing OB GYNs is that there isn’t enough data to recommend for or against creatine in pregnancy, so they don’t recommend it.
It also helps to keep the doses straight, because they differ wildly across this literature and blurring them is how bad advice gets made. The typical adult supplement dose studied for muscle and cognition is 3 to 5 g of creatine monohydrate per day. The pregnant women in the 2025 dosing trial took 5 g three times a day, or 15 g daily, for three days, because the researchers were deliberately trying to reach a target blood concentration quickly. The spiny mice ate a 5 percent creatine diet, which scaled to body size dwarfs any human protocol, and the guinea pigs received 0.3 g per kg per day, which for a 70 kg person would be about 21 g daily. None of these numbers is a recommendation, and a result produced at one dose in one species says nothing reliable about a different dose in a different species. Any article that quotes the spiny mouse survival findings and then suggests a standard 5 g scoop will do the same thing for a human pregnancy is not summarizing the science, it’s decorating a sales pitch with it.
One practical note if you and your doctor do discuss it. Creatine supplementation raises creatinine, the breakdown product used in routine blood and urine tests as a marker of kidney function, without indicating actual kidney harm in healthy people. In pregnancy, where kidney function gets monitored, an unexplained creatinine bump can trigger concern and extra testing, which is one concrete reason your care team needs to know about any supplement you take.
What About Breastfeeding
The best neutral source here is LactMed, the National Institutes of Health drugs and lactation database, last revised in July 2025. It reports that creatine is a normal component of human milk, supplying roughly 9 percent of an infant’s daily creatine requirement, with the highest concentrations in colostrum and levels declining over the first two weeks before stabilizing. The critical gap, stated right in the record, is that milk creatine levels have never been measured after maternal supplementation in humans. We simply do not know whether supplementing changes what a nursing baby receives, and until someone measures it, the honest position is the same as for pregnancy. Discuss it with your doctor and your baby’s pediatrician rather than extrapolating from adult data.
Where US Regulation Leaves You
In the United States, creatine is sold as a dietary supplement, which means the FDA does not review or approve it before it reaches the market and no product has any authorized claim related to pregnancy. The FDA’s role is largely after the fact, acting on products shown to be adulterated or misbranded. In Europe the framework differs in structure, with EFSA having assessed specific creatine claims for adults around physical performance, but no European authority has endorsed creatine for pregnancy either. Practically, this puts the burden on you. If you and your clinician decide any supplement is appropriate, choosing a product certified by an independent testing program is a sensible habit, since certification addresses whether the powder contains what the label says and screens for contaminants, which matters more than usual when you’re pregnant. It says nothing about whether taking it is a good idea.
Who This Research Is Actually For
It’s worth being clear about the destination of all this science, because it isn’t the general supplement aisle. The Australian program’s stated goal, repeated across their papers, is a treatment that could be given in pregnancies at elevated risk of complications involving oxygen deprivation, where the animal data suggests preloaded creatine stores might reduce damage. That is a medical use case, aimed at a specific clinical problem, that would need to be proven in randomized controlled trials and delivered under medical care.
That is very different from the question most readers of this site actually have, which is whether a healthy pregnant woman who lifts weights or cares about her cognition should keep taking her daily 5 g. For that question the evidence base is close to empty. No trial has tested whether routine creatine supplementation in healthy pregnancy does anything at all, good or bad, for the mother’s strength, energy, mood or cognition, or for the baby. The cohort data showing no relationship between maternal creatine levels and newborn growth in healthy pregnancies should temper anyone’s expectation of dramatic effects. If you stopped creatine on a positive test out of caution, the research gives you no reason to feel you’re missing a proven benefit. If you’re considering starting it while pregnant, the research gives you no efficacy data to weigh against the unknowns.
One group deserves a specific mention. Women who eat little or no meat and fish get essentially no dietary creatine and rely entirely on their body’s own synthesis, and the 2024 cohort study found animal protein intake tracked with maternal creatine levels through most of pregnancy. Whether that matters for any outcome is unknown, and the right response is a conversation with your doctor or a dietitian about overall protein and nutrient adequacy in pregnancy, not a unilateral decision to supplement.
What Would Change the Picture
This field is moving, which is part of why I find it worth following. The Melbourne group has now published the metabolism map of normal pregnancy, the female safety review, the pharmacokinetics and dosing work, and the full term animal safety study, which is the deliberate, unglamorous sequence you build before an outcome trial. A properly powered randomized controlled trial of creatine supplementation in pregnancy, first for safety across a longer window and eventually for clinical outcomes in high risk pregnancies, is the study that would move this topic from interesting to actionable. Human breast milk measurements after supplementation would do the same for the postpartum question, and longer follow up of children from any supplemented pregnancies would address the neurodevelopmental questions the sheep data raised.
Until those results exist, the state of creatine and pregnancy is easy to summarize honestly. Strong biological rationale, consistent and genuinely striking animal data in models of birth complications, early human safety signals that are encouraging and thin, and a complete absence of evidence that supplementing helps or harms a healthy human pregnancy. That’s an “early” evidence rating by any fair standard, and pretending otherwise, in either direction, is the kind of thing this site exists to push back on. If you’re pregnant and holding a tub of creatine, the science currently points to one action above all others, which is a conversation with your obstetrician, taking this article with you if it helps.