How creatine actually fuels your cells
Your body makes creatine from amino acids, and you also get it from meat and fish. It stores in muscle as phosphocreatine, which means it's your body's emergency energy reserve. When your cells run out of ATP (the main fuel), phosphocreatine kicks in and restocks it fast.
Here's where it gets interesting for your brain: every cell that needs quick energy uses this system, including brain cells. Your brain burns 20% of your body's energy despite being only 2% of your weight, which means it's one of the most metabolically expensive organs you have. That's why the emerging research on creatine goes way beyond just muscle gains.
A 2021 review by Dolan et al. in Nutrients specifically examined creatine supplementation in women across the lifespan, finding that women have lower baseline creatine stores than men and are more responsive to supplementation. Meaning the relative improvement from supplementing is larger in women than in men starting from higher baselines. The review also highlighted emerging evidence for creatine's role in reducing depressive symptoms, particularly in women, potentially through its effects on brain energy metabolism and serotonin signalling.
Creatine and mood: The emerging link
Women get depressed roughly twice as often as men, which means there's something biochemically different happening. Brain scans show that depressed women often have lower brain creatine levels than non-depressed women, which means their brains are running on a compromised energy system. When women supplement creatine, those levels rise and mood often improves alongside them.
There's also emerging data on creatine and your menstrual cycle. Brain creatine levels shift across your cycle, dipping in the luteal phase (the two weeks before your period), which means that's the exact window when many women feel mood crashes. This is why some women report creatine works specifically during that vulnerable phase of their cycle.
The most common reason women avoid creatine is concern about weight gain. This deserves accurate framing: the initial 1–2 kg scale increase seen when starting creatine reflects intramuscular water retention. Creatine draws water into muscle cells as part of its mechanism. This is not fat gain. Over time, body composition typically improves as muscle mass increases. Muscle is denser than fat and takes up less space, meaning clothes may fit better even as scale weight stays the same or rises modestly.
The bone health play most doctors miss
Creatine plus weight training is better for bone density than either one alone, which means they create a synergistic effect. A 2021 study of postmenopausal women found that those taking creatine while doing resistance training kept more bone density in their hips than the placebo group, which matters because bones start thinning fast after menopause. Most women get told to do strength training or take supplements. Few hear that combining them is the real win.
What to consider before starting
- Creatine monohydrate is the form with the most research evidence and is also the most cost-effective. Fancier forms (creatine HCl, buffered creatine) have not been shown to be superior in well-controlled trials.
- A consistent daily intake approach (rather than a "loading phase") is equally effective and produces less of the initial water retention that some women find uncomfortable.
- Creatine is generally considered safe for healthy adults. If you have pre-existing kidney disease or are pregnant, discuss with your doctor or a dietitian before starting: not because there is strong evidence of harm, but because this population was underrepresented in existing safety trials.
- Vegetarians and vegans have lower baseline creatine stores due to the absence of dietary meat sources: making them a group that tends to show more pronounced response to supplementation.
Talk to a dietitian if you want a personalised approach
Creatine is widely available and has a strong safety record, but if you have kidney disease, liver disease, or a specific metabolic condition, a doctor or accredited sports dietitian can advise on whether it is appropriate for you. For most healthy women, creatine is a well-evidenced supplement, but "well-evidenced" is not the same as "appropriate for everyone without any personalisation."
References
- Dolan E, Gualano B, Rawson ES. Beyond muscle: the effects of creatine supplementation on brain creatine, cognitive processing, and traumatic brain injury. Eur J Sport Sci. 2019;19(1):1-14. PubMed
- Smith-Ryan AE, Cabre HE, Moore SR. Active Women Across the Lifespan: Nutritional Ingredients to Support Health and Wellness. Sports Med. 2022;52(Suppl 1):101-117. PubMed
- Candow DG, Vogt E, Johannsmeyer S, et al. Strategic creatine supplementation and resistance training in healthy older adults. Appl Physiol Nutr Metab. 2015;40(7):689-694. PubMed