If you take creatine and you’re planning a pregnancy, you’ve probably already noticed how confidently the internet answers a question that science has barely started asking. Some articles tell you creatine during pregnancy is fine, even beneficial. Others tell you to drop it the moment you see two lines on a test. Both camps are more certain than the evidence allows.
Here’s the short version. There is a genuinely interesting body of animal research suggesting creatine matters during pregnancy, and a small but growing set of human studies from a research group in Australia that has been carefully laying the groundwork for real trials. What does not yet exist is a completed randomized controlled trial of creatine supplementation in pregnant women. Not one. That means nobody, including me, can tell you it’s proven safe or proven beneficial during pregnancy, and no health authority currently recommends it. If you’re planning a pregnancy, the honest position is this: creatine looks reasonable before conception based on a large safety literature in nonpregnant women, the picture during pregnancy itself is an open research question, and the decision about what to do when you conceive belongs in a conversation with your doctor or midwife, not in a blog post. Now let’s go through what the research actually shows, because the details matter and most coverage of this topic skips them.
Why Pregnancy Raises the Creatine Question at All
Creatine is a compound your body uses to regenerate ATP, the molecule that powers cells, especially in tissues with high or rapidly changing energy demands like muscle and brain. You make some of it yourself from the amino acids arginine, glycine, and methionine, and you get the rest from food, mostly meat and fish. Every day roughly 1.7 percent of your total creatine pool spontaneously degrades into creatinine and leaves in your urine, which means it constantly needs replacing. In an adult woman that daily replacement need is around 1.6 grams, met about half by diet and half by synthesis.
Pregnancy is a state of extraordinary energy demand. A placenta gets built from scratch, a fetus grows an entire body including a very energy hungry brain, and the mother’s own tissues remodel to support all of it. So researchers reasonably asked whether the creatine system gets stretched during gestation, and whether topping it up might help, particularly in pregnancies where the fetus faces low oxygen.
A few human observations keep this question alive. A 2021 review of creatine metabolism in female reproduction and pregnancy by Muccini and colleagues pulled together the case for creatine as an important metabolite across reproduction, pregnancy, and newborn health, while being clear that most of the direct evidence comes from animals. An earlier retrospective human cohort had suggested maternal creatine levels were related to fetal growth, and a matched case control study by Heazell and colleagues reported that serum creatine was about 20 percent lower in women who went on to have an adverse pregnancy outcome, a composite that included stillbirth, preterm birth, and small for gestational age babies. Those are associations, not causes. Low creatine in those studies might be a marker of something else entirely, like overall diet or illness. But they were enough to justify studying the system properly.
There’s also a dietary intake angle. Analyses of the American NHANES nutrition surveys led by Sergej Ostojic estimated that pregnant women in the US consume about 0.83 grams of dietary creatine per day on average, with a median of 0.66 grams, and that a majority fell below the roughly 13 milligrams per kilogram of body mass per day that the authors consider adequate for adult women. I’d treat that “adequate” threshold with some caution, since there is no official dietary requirement for creatine and the estimate rests on assumptions about how much of daily need comes from food. Still, it tells you that typical intakes are modest, and that women eating little or no meat, who get almost no dietary creatine at all, sit well below everyone else. Whether that matters for pregnancy outcomes is exactly the kind of question that has not been answered yet.
What the Animal Studies Found, and Why They Started the Whole Field
The animal work is the reason anyone talks about creatine and pregnancy, so it deserves an honest summary. In a series of experiments summarized in a 2014 review by Dickinson, Ellery and colleagues, researchers at Monash University and the Hudson Institute in Melbourne gave creatine to pregnant spiny mice and then exposed the offspring to oxygen deprivation around birth. Maternal creatine supplementation raised creatine levels in the placenta and fetal tissues and reduced death and organ injury after these hypoxic insults, including protection of the newborn brain, kidney, and muscle. The rationale is plausible: when oxygen runs short, cells fall back on the creatine phosphate system to keep ATP available, and a fetus with fuller creatine stores has a bigger buffer.
Those are striking results, and they replicated across multiple experiments in that model. But they are results about rescue from a severe insult in a rodent, at doses scaled to body weight far above what any human takes, and rodents are born at a different stage of brain development than humans. A 2021 systematic review of the preclinical studies on creatine for perinatal hypoxic injury concluded the animal evidence was promising but flagged clear knowledge gaps that needed closing before anyone could responsibly run clinical trials for birth asphyxia.
More recently the same research network published something arguably more relevant to a healthy person planning a pregnancy: a safety study in a better animal model. In a 2025 guinea pig study, 27 pregnant guinea pigs received 0.3 grams per kilogram per day of creatine monohydrate from day 21 of gestation, against 29 controls. Guinea pigs matter here because their offspring, like human babies, are born at a relatively mature stage of development. Supplementation had no significant effect on maternal weight gain, fetal growth measured by ultrasound, umbilical blood flow, birthweight, pregnancy length, or stillbirth rate, and the offspring showed normal glucose tolerance and body composition at four weeks of age. That’s a null result, and in this context a null result is the good news: the study was looking for harm in a normal pregnancy and didn’t find it. It’s still an animal study, and I’d note it was funded in part by a cerebral palsy research charity with an obvious interest in this therapy eventually working, which doesn’t invalidate anything but is worth knowing.
The Human Evidence That Actually Exists
Now the part most articles get wrong, either by inflating what exists or by pretending nothing does.
Start with the strongest statement of absence. A Cochrane review on creatine in pregnancy for neuroprotection of the fetus searched for randomized trials and found none. Zero completed, zero ongoing at the time of the search. The authors could conclude nothing about benefit or harm and simply called for safety work followed by proper trials. That review dates from 2014, and while the field has moved since, its core finding has not changed: as of the research I could find through 2026, no randomized controlled trial of creatine supplementation in human pregnancy has published outcomes. When you see a website claim that studies show creatine improves newborn Apgar scores or reduces maternal cramping, ask which trial. I went looking, and I could not find a registered, published randomized trial behind those claims. Some AI generated health pages now cite trials that do not appear to exist in any journal or registry. That’s worth saying bluntly, because this topic seems to attract fabricated citations.
What does exist from humans falls into three buckets.
First, safety data in nonpregnant women. Before anyone would ethically give creatine to pregnant women, the Melbourne group ran a systematic review and meta analysis of adverse outcomes in females taking oral creatine, published in 2020 by de Guingand and colleagues. Across clinical trials covering 951 women aged 16 to 67, treated for up to a year, they found no deaths, no serious adverse events attributable to creatine, and no increase in milder side effects like stomach upset compared with placebo. That’s reassuring, and it matches the broader safety literature. But read the population line again: these were not pregnant women. The review was explicitly a stepping stone.
Second, observational work in pregnancy itself. The Creatine and Pregnancy Outcomes cohort study, published in 2024 in the American Journal of Clinical Nutrition, followed 282 Australian women with low risk singleton pregnancies, sampling blood and urine five times between 10 and 36 weeks of gestation. Nobody was given supplements; this was a study of normal physiology. Plasma creatine stayed remarkably stable across pregnancy, around 35 to 38 micromolar, while urinary creatine excretion fell in late gestation and the amount of animal protein in the diet correlated with plasma creatine until about 32 weeks. The authors read this as the body actively defending its creatine levels during pregnancy, tightening excretion as demand rises. Notably, the study found no association between maternal creatine levels and how big the babies grew, which cuts against the simplest version of the “more creatine, better fetal growth” story from the earlier retrospective work. It did find that higher urinary guanidinoacetate, a creatine precursor, in early pregnancy was associated with a very slightly smaller head circumference at birth, a finding I’d file under “interesting, needs replication” rather than anything actionable.
Third, and most importantly, the first ever dosing and safety trial in pregnant humans. In 2025 the group published an open label dose escalation trial of creatine monohydrate in pregnancy. In stage one, a single 5 gram dose went to eight nonpregnant women and seven women in the third trimester, with blood sampled over ten hours. In stage two, eight pregnant women took 5 grams every eight hours for three days. Pregnancy in the third trimester did not meaningfully change how the body handled creatine, participants reported no major adverse events or side effects, and fetal monitoring during the study raised no concerns. This is real progress and it deserves credit. It’s also tiny, short, unblinded, had no placebo group, and was designed to answer a pharmacokinetic question, which is the study of how a substance moves through the body, not whether creatine helps or harms a pregnancy. Fewer than twenty pregnant women, dosed for at most three days. That is the entire interventional human evidence base as it stands. The researchers themselves describe it as groundwork for the trials to come, and they are being appropriately careful. The people repackaging this work into “creatine is safe in pregnancy” headlines are not.
Before Conception: A Different and Easier Question
Planning a pregnancy involves a stretch of time before you’re pregnant, and the evidence picture there is genuinely different, because you’re just a nonpregnant adult, and creatine in nonpregnant adults is one of the most studied supplements in existence.
The safety record in women specifically is solid. The de Guingand meta analysis I mentioned covered doses used in clinical trials for up to a year without serious adverse events. A 2025 review of the most common safety concerns around creatine in Frontiers in Nutrition went through the recurring worries, cancer, kidney damage, dehydration, digestive trouble, and found the clinical evidence doesn’t support them in healthy people at standard doses, while explicitly noting that evidence is lacking for pregnant women and urging caution in that group and in anyone with preexisting kidney disease. Large analyses of trial data have found gastrointestinal complaints at rates similar to placebo. Creatine does raise serum creatinine slightly, because creatinine is simply what creatine turns into, and this can make a routine kidney blood test look worse without the kidneys being any worse. If you supplement and get blood work done, tell whoever ordered the test.
What about fertility itself? Here the claims run far ahead of the data, and I’d be doing you a disservice to pretend otherwise. An analysis of NHANES 2017 to 2020 data by Ostojic, Ellery and colleagues found that women whose diets provided at least 13 milligrams of creatine per kilogram of body mass daily had lower odds of irregular periods, an odds ratio of 0.75, than women below that threshold. That is a cross sectional association from dietary recall surveys. Women who eat more meat differ from women who eat less in dozens of ways, and no amount of statistical adjustment fully fixes that. It generates a hypothesis; it proves nothing. Claims that creatine improves egg quality or IVF outcomes in women trace back to animal work, lab studies on cells, and culture media experiments, not to trials in women trying to conceive. If someone sells you creatine as a fertility supplement, they’ve outrun the science.
So my honest read on the preconception window: if you already take 3 to 5 grams of creatine daily for training or cognitive reasons and you’re healthy, the existing safety literature in nonpregnant women gives no specific reason to stop while you’re trying to conceive, and no good evidence that it will help you conceive either. One practical wrinkle deserves mention: you’re typically pregnant for a couple of weeks before a test tells you so, which means “I’ll take it until I’m pregnant” really means “I’ll take it into very early pregnancy.” Nothing in the animal or human data flags early exposure as a specific danger, but nothing has studied it either, and that’s exactly the kind of detail worth raising with your doctor before you start trying rather than after.
During Pregnancy: Where the Line Actually Sits
During pregnancy itself, the situation is simple to state and unsatisfying to hear. No completed randomized trial exists. No health authority, not the FDA, not ACOG, not any body I could find in the US, UK, or Europe, recommends creatine supplementation during pregnancy. The FDA doesn’t approve supplements for safety before sale in any case, which is worth remembering whenever a product implies official endorsement, and prenatal guidance from mainstream medicine sticks to nutrients with established evidence like folic acid, iron, and vitamin D.
The researchers closest to this field are running trials precisely because they believe creatine might eventually help pregnancies complicated by fetal growth restriction or oxygen deprivation. That is a hypothesis under investigation, not a recommendation, and the target populations for those future trials are high risk pregnancies under medical supervision, not healthy people optimizing. The Cochrane authors were explicit about the sequence: establish safety first, then run placebo controlled trials, then talk about use. We are currently somewhere in the middle of step one.
It’s also worth spelling out what the unknowns actually are, because “no evidence of harm” and “evidence of no harm” are different things. Creatine crosses the placenta; raising fetal creatine levels is the entire point of the proposed therapy. A fetus normally synthesizes much of its own creatine, and one theoretical question researchers have taken seriously is whether sustained supplementation could downregulate that machinery, essentially teaching the fetal system to slack off. The guinea pig data and a rodent study cited by Examine’s review of creatine safety in pregnancy are reassuring on this, finding no impairment of the newborn’s ability to make creatine, but it has never been checked in a human baby. Kidney workload rises substantially in pregnancy, and while creatine doesn’t harm healthy kidneys, nobody has studied months of supplementation on top of pregnancy’s renal demands. Conditions like preeclampsia change the calculus further. None of these are known harms. All of them are unknowns, and pregnancy is the setting where medicine has learned, sometimes brutally, to respect unknowns.
There is one narrow human data point on longer term use worth mentioning for completeness. A 2020 case report described a pregnant woman with AGAT deficiency, a rare genetic disorder that prevents normal creatine synthesis, who took creatine throughout gestation under medical care, at 2 then 3 grams daily, and delivered a healthy infant developing normally at one year. A single medically supervised case in a person with a creatine deficiency disease tells you almost nothing about supplementation in typical pregnancy, but it is, remarkably, close to the longest human exposure on record.
What the Studies Used Versus What People Actually Do
One habit worth building whenever you read supplement research: compare the studied dose and duration to real world use. In the pregnancy dose escalation trial, women took 5 grams three times daily, 15 grams total, for three days, a loading style protocol chosen to answer a pharmacokinetic question quickly. Nobody takes creatine that way for months, and the trial doesn’t claim to tell you about months. The guinea pig safety study used 0.3 grams per kilogram per day, which for a 70 kilogram human would be about 21 grams daily, several times the standard 3 to 5 gram maintenance dose, sustained through most of gestation. Animal doses are scaled up deliberately, but it means the reassuring animal safety data comes from exposures well above what a supplementing human would take, which cuts in the reassuring direction, while the efficacy data comes from injury models no healthy pregnancy resembles, which cuts the other way. The observational cohort studied no supplement at all, just diet. Keep those three things separate and most of the confusing headlines in this space resolve themselves.
If You Take Creatine Now and Want to Conceive
I can’t give you medical advice, and this is a decision genuinely worth ten minutes of a professional’s time, so put it on the list for a preconception appointment. But I can tell you what the evidence supports discussing.
The safety case for standard creatine doses in healthy nonpregnant women is strong, resting on that 951 woman meta analysis and decades of wider trial data. The case for continuing into pregnancy has no trial evidence behind it, and the case that stopping causes any harm has none either, since your body synthesizes creatine and defends its plasma levels through pregnancy, as the cohort study showed. Stopping is the low information cost, low regret option, which is why most clinicians land there, and why even supplement friendly practitioners commonly suggest discontinuing once pregnancy is confirmed. If you eat little or no meat, your baseline creatine intake is lower than average, which is a reasonable thing to mention to your doctor alongside the rest of your diet. And if anyone, including a supplement brand, tells you that taking creatine during pregnancy will protect your baby’s brain, remember that this claim currently rests on spiny mice and guinea pigs, that the scientists who did that work are the loudest voices saying human trials are still needed, and that the Cochrane review found nothing to pool. Enthusiasm for a hypothesis is not evidence for a recommendation.
A Note on What Comes After
Planning a pregnancy usually means thinking past the birth too, so it’s worth a word on breastfeeding, where the evidence is even thinner than for pregnancy itself. The Muccini review notes that human breast milk contains surprisingly little creatine, and that a term baby likely synthesizes somewhere between 64 and 93 percent of its daily creatine needs on its own. Whether maternal supplementation changes milk creatine content, and whether that would matter for the baby either way, has not been studied in any trial I could find. As with pregnancy, the absence of evidence runs in both directions: nothing shows harm, nothing shows benefit, and no authority recommends it. The same conversation with your doctor covers this ground, and the same logic applies. When a question has never been tested, the burden of proof sits with taking the supplement, not with skipping it.
I’d also flag one thing for anyone whose reason for taking creatine is cognitive rather than athletic, since that’s likely why many readers of this site are here. The cognitive literature on creatine, whatever you make of its mixed results, comes entirely from nonpregnant adults. Nothing about it transfers to pregnancy, and pregnancy related fatigue and brain fog, real as they are, have never been a studied indication for creatine. If a supplement marketer implies otherwise, they are extrapolating from a population that was not pregnant to one that is, which is precisely the move careful science refuses to make.
What Would Change This Picture
This field is moving, and the answer you’d get in 2030 may differ from the one honest writers can give in 2026. The Melbourne group has stated its next steps plainly: having established dosing and short term tolerability, the path leads to randomized, placebo controlled trials of creatine supplementation in pregnancy, powered to detect effects on maternal and infant outcomes. If those trials happen and show safety over months of use, the preconception and pregnancy conversation changes meaningfully. If they show benefit in high risk pregnancies, creatine could become something obstetricians prescribe in specific situations, the way magnesium sulfate is used for fetal neuroprotection before very preterm birth. And if they show harm, or nothing, that will matter just as much, and you can expect this site to report it either way. Until then, creatine and pregnancy remains a promising research program wearing the internet’s costume of a settled answer. Plan accordingly, and take the actual question to your actual doctor.