Creatine for Women Trying to Conceive: What We Know and What We Don't

If you lift, you've probably heard that creatine isn't just for men anymore. It's marketed for women's strength, energy, mood and, increasingly, "hormone health" and fertility. Some of that interest comes from legitimate research groups. Some of it runs well ahead of the data. Because this is a supplement you may already be taking every day, it's worth being precise about what's known, what's guessed, and what nobody has tested yet.

Contents

• Creatine in a few sentences
• Where creatine shows up in female reproduction
• Safety data in women (not pregnant)
• Pregnancy research: mostly animals
• The dietary creatine study you may have seen
• What we don't know
• How to decide with your clinician

Creatine in a few sentences

Creatine is a compound your body uses to recycle energy quickly in muscle, brain and other tissues. You get it two ways: your body makes some, and you eat some, mainly in meat and fish. A 2021 review in Nutrients estimates that in adults the split between diet and the body's own production is roughly half and half. Because the body breaks down a small fraction of its creatine every day, it needs a steady supply from one or both sources.

That last point is why people who eat little or no meat or fish are often the ones most interested in supplements. It's also why "creatine is natural" doesn't settle anything: your body is used to getting some creatine, but that tells us nothing about the effect of adding several grams more during the weeks you're trying to conceive.

Where creatine shows up in female reproduction

The most thorough summary of this area is a 2021 review by Muccini and colleagues, a group in Australia that has studied creatine in pregnancy for years. Its main points:

• Eggs: Creatine and phosphocreatine have been found in mouse and human oocytes. Where that creatine comes from is still unclear.
• Follicular fluid: Creatine is present in human follicular fluid, and levels were lower in women with endometriomas.
• Uterine lining: The enzyme system that uses creatine is active in the endometrium and increases in the second half of the cycle.
• Pregnancy: In human data the review cites, average blood creatine during pregnancy was about 35% lower than in non-pregnant women.

That's a picture of creatine being present and involved in reproductive tissues. It is not evidence that more creatine improves eggs, ovulation or implantation. The review itself states plainly that "there is still no consensus on whether creatine is essential for successful reproduction."

Safety data in women (not pregnant)

The best safety evidence comes from a 2020 systematic review and meta-analysis from the same research group, published in Nutrients. It is useful because most creatine research has been done in men.

That's genuinely reassuring for women of reproductive age in general. Two caveats matter for you, though. First, these were not women trying to conceive or women who were pregnant. Second, the authors themselves called for better surveillance and reporting of adverse outcomes in future female studies, which tells you how thin the data were.

Pregnancy research: mostly animals

The reason creatine and pregnancy keeps coming up is a set of animal studies looking at whether creatine might protect a baby's brain when oxygen supply drops around birth.

• Spiny mice: In this species, adding creatine to the mother's diet from mid-pregnancy improved pup survival and reduced markers of brain injury after oxygen deprivation during birth.
• Fetal sheep: A 2023 study from the Hudson Institute in Melbourne found signs of protective effects on the fetal brain during oxygen deprivation. The researchers' own summary was that "more research is required."
• Humans: The 2021 review found only a single human case report of creatine use in pregnancy, in a woman with a rare inherited inability to make creatine. It reported no completed human supplementation trials in pregnancy.

The researchers leading this work are optimistic, and they've said a human clinical trial is the goal once the right dose and safety checks are worked out. In 2023 they described that trial as two to three years away. That is the honest status: a promising research program, not a recommendation. The 2021 review is explicit that "specialized safety and tolerability studies in pregnant women or those trying to conceive are still required."

The dietary creatine study you may have seen

A 2024 paper in Food Science & Nutrition made the rounds as "creatine linked to better reproductive health." It used U.S. national survey data (NHANES 2017–2020) from 4,522 women and girls aged 12 and up, and it looked only at creatine from food. Supplements were excluded.

Women who ate at least 13 mg of creatine per kilogram of body weight per day had lower odds of irregular periods (odds ratio 0.75) than women below that level. Lower intake was associated with higher odds of several other outcomes, such as pelvic infection, hysterectomy and oophorectomy.

That's a correlation in survey data. People who eat more meat and fish differ from those who eat less in many ways, and the study can't separate those from creatine itself. It also didn't report on infertility. The authors themselves said further studies are needed. It doesn't tell you anything about what a supplement does.

What we don't know

Here is the list of open questions as plainly as we can put it:

• Whether creatine supplements affect ovulation, egg quality, fertilization or implantation in humans, in either direction.
• Whether taking creatine around conception and in the earliest weeks of pregnancy is safe for the embryo.
• What dose, if any, would be appropriate during pregnancy. The researchers working on this say finding the right dose is the next step.
• Whether results in women with conditions like PCOS or endometriosis would differ.

Until those studies exist, the absence of reported harm is not evidence of safety, and it isn't evidence of benefit either.

How to decide with your clinician

This is the kind of decision where a short conversation helps more than any article. Bring these points:

1. Why you take it. Training performance? Vegetarian diet? Mood or energy? The reason affects whether pausing it costs you much.
2. Exactly what's in your product. Plain creatine monohydrate is very different from a pre-workout blend with caffeine and stimulants. Write down the full ingredient list and amount per serving.
3. Your health history, especially kidney disease or other conditions that affect how you'd handle any supplement.
4. Your timeline. Whether you're just starting to try, already in a fertility workup, or doing IVF changes the conversation.
5. What you'll do when you get a positive test. Decide in advance, so you're not searching forums at 5 a.m.

Our supplement list for doctor review is built for exactly this. If you're unsure whether you're officially "trying" yet, howtohaveababy.com's TTC checklist is a good place to line up everything else.

What about the male partner?

Creatine questions for men are a different topic, with different evidence. We cover that, along with pre-workout and SARMs, in gym supplements and sperm.

And if you're drawn to creatine for "egg energy," you'll probably run into NAD+ and NMN next. Our guide to NAD+, NMN and egg quality covers that evidence, which has a very similar shape: strong biology, mostly animal data.

Sources

• Muccini AM, Tran NT, de Guingand DL, et al. Creatine metabolism in female reproduction, pregnancy and newborn health. Nutrients. 2021;13(2):490. PubMed 33540766
• de Guingand DL, Palmer KR, Snow RJ, Davies-Tuck ML, Ellery SJ. Risk of adverse outcomes in females taking oral creatine monohydrate: a systematic review and meta-analysis. Nutrients. 2020;12(6):1780. PubMed 32549301
• Hudson Institute of Medical Research. Creatine supplement safe for women (July 2020). hudson.org.au
• Hudson Institute of Medical Research. The benefits of creatine: a safer birth for mum and baby (May 2023). hudson.org.au
• Association between dietary intake of creatine and female reproductive health: Evidence from NHANES 2017–2020. Food Science & Nutrition. July 2024. DOAJ
• NSF. Supplement and Vitamin Certification. nsf.org