You're standing in the kitchen, trying to remember why you walked in. You had something on your mind just a moment ago, but now it's gone. Maybe you didn't sleep particularly well the night before, or you've noticed that concentrating on everyday tasks sometimes takes more effort than it used to. These little moments can be frustrating, especially when they begin happening more frequently.

For many women, changes in sleep, memory, and concentration become part of the conversation during perimenopause. And as more women begin looking for ways to feel better, a supplement traditionally associated with athletes and weightlifting is getting some unexpected attention. It's called creatine, and lately, people are talking about it for reasons that have little to do with building bigger muscles.

But what exactly is creatine, and could it really help with sleep or the mental fog that some women experience during perimenopause? A small clinical trial published in October 2026 explored those questions, with findings that are interesting but not nearly as conclusive as some supplement marketing might suggest.

Creatine is a naturally occurring compound that helps our bodies supply energy for muscle movement and other cellular activities. We make some creatine ourselves and obtain additional amounts from foods such as meat and fish. It's also available as a supplement, most commonly in a powdered form called creatine monohydrate. Although it's best known for helping support certain types of exercise performance, researchers are increasingly interested in whether creatine might also influence how the brain uses energy.

A randomized study published on October 24, 2026, in the European Journal of Applied Physiology examined 51 perimenopausal women over six weeks. Researchers compared three groups: women who received creatine while participating in resistance training, women who received a placebo while following the same training program, and women who did not participate in the training intervention.

The researchers investigated whether creatine supplementation might influence sleep, cognitive performance, and measures of brain oxygenation. Women receiving creatine showed improvements in certain measures of sleep consistency and prefrontal oxygenation compared with the placebo group. These findings are interesting because the prefrontal cortex is involved in attention, decision-making, and other cognitive processes. However, changes in brain oxygenation do not necessarily translate into noticeable improvements in thinking or memory.

The results were less convincing when researchers examined cognitive performance directly. Although reaction times improved during the study, those improvements were not significantly different between the creatine and placebo groups. In other words, the trial did not establish that creatine improved concentration or relieved the experience commonly described as brain fog.

The study adds to a growing conversation about creatine and women's health, although its limitations are important. With only 51 participants and a six-week intervention, the findings are preliminary. The researchers also disclosed financial relationships with creatine manufacturers, while an investigator involved in wearable-data analysis was employed by the device manufacturer. Those disclosures don't automatically invalidate the research, but they reinforce the importance of independent replication.

It's also important to distinguish between improving sleep consistency and improving sleep quality. A more consistent sleep schedule doesn't necessarily mean someone is sleeping longer, waking less frequently, or feeling more rested in the morning. While the findings suggest that creatine may influence certain sleep-related measurements, they don't establish that the supplement treats insomnia or other sleep disturbances associated with perimenopause.

There is also a difference between supporting muscle performance and treating symptoms associated with hormonal changes. Creatine may have a role in certain exercise programs, but the evidence is not yet sufficient to recommend it specifically for perimenopausal sleep problems or brain fog. Women experiencing persistent sleep disruption or cognitive difficulties may benefit from discussing those concerns with a healthcare professional rather than assuming a supplement will address the underlying cause.

Perhaps the most useful part of this research is the attention it brings to maintaining strength and function during a period of physical change. Resistance training has benefits that extend beyond appearance or body weight, including supporting muscle strength and everyday physical capabilities. We explored this broader perspective in our Aligned & Well article, What If Your Goal After 50 Isn't Weight Loss, but Staying Capable?, where we discussed why maintaining strength and mobility deserves attention regardless of what the scale says.

The creatine findings are worth following, particularly as researchers continue investigating how nutrition, movement, sleep, and cognitive function interact during perimenopause. But one small study isn't enough to turn a promising possibility into a recommendation. Understanding what the research actually measured, and what it didn't, helps us separate scientific progress from the expectations that often surround popular supplements.

For now, the more useful question may not be whether creatine is the next supplement women should add to their routines. It may be how we can better support strength, sleep, and well-being without assuming that every change requires another product.