Creatine And Working Memory — Not Just For The Gym
Quick Read Creatine is known as a muscle supplement, but emerging research suggests it may also boost brain performance. Your
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Simon Parrott – Vitacuity Ltd
When you take supplements matters far less than whether you take them consistently. Most supplements work by building up in your body over time, not by acting in a specific window, so the exact hour is usually irrelevant. The main exceptions are caffeine, which needs to be in your system during the activity you want to perform, and fat-soluble vitamins like D and K, which absorb better with meals containing fat. Creatine timing is heavily debated but research shows pre- or post-workout makes almost no difference, as long as you take it daily alongside carbohydrates to boost absorption.
The research on supplement timing is surprisingly limited, especially for people over 40 and for combinations of multiple supplements together. What studies do exist consistently show that total dose and consistency matter far more than the clock. The emerging science of how circadian rhythms affect nutrient metabolism is interesting but not yet practical enough to change most people’s routines.
The practical advice is simple: build a routine you can stick to, pair fat-soluble vitamins with meals, time caffeine sensibly before tasks you need focus for, take creatine daily with carbs, and stop worrying about whether you took your supplements at the exact optimal minute. The biggest mistake most people make is skipping supplements because the timing rules felt too complicated to follow.
Verdict: Consistency and dose matter far more than timing for most supplements, with the main exceptions being caffeine and fat-soluble vitamins taken with meals.
What if you’ve been spending more mental energy on *when* to take your supplements than the science actually warrants? Most of us have been there, agonising over whether to swallow our creatine before the gym or after, whether our vitamins should be morning or evening, whether the window is closing before we’ve even put the kettle on. The supplement timing question has spawned an entire industry of advice, much of it delivered with far more confidence than the evidence deserves. Vitacuity has reviewed over 1.77 million research papers and pulled together the most relevant findings on this question. The honest answer? Timing matters, but probably not in the way you think, and certainly not as much as the basics.
To understand why timing does or doesn’t matter, it helps to think about what different supplements are actually doing inside your body once you swallow them.
Some supplements work acutely, they need to be active in your system at a specific moment. Caffeine is the obvious example: take it an hour before exercise, and it’s doing its job. Take it at 9pm, and it’s doing a different, less welcome job. Other supplements work by gradually saturating tissues over days or weeks. Creatine, for instance, works by loading your muscles with phosphocreatine stores, a process that happens over time, not in the hour after you take a capsule [4]. Then there are fat-soluble vitamins, which are absorbed best alongside dietary fat, making meal timing genuinely relevant, though the meal matters more than the clock [2].
The emerging science of *chrono-nutrition*, studying how meal and nutrient timing interacts with our circadian rhythms, adds another layer. Our bodies do have internal clocks that influence digestion, hormone release, insulin sensitivity and nutrient metabolism. The question is how much this actually moves the needle compared to simply *taking the supplement at all* [3].
The answer, as the research repeatedly shows, is that consistency and dose almost always trump timing.
If you spend any time in fitness circles, you’ll have heard people argue passionately about the creatine timing window. Pre-workout? Post-workout? The debate turns out to be largely academic.
A 2022 randomised, double-blind, placebo-controlled trial published in *Frontiers in Sports* investigated exactly this question [14]. Thirty-four resistance-trained male and female collegiate athletes were assigned to take 5g of creatine monohydrate either within one hour before training, within one hour after training, or a placebo, for eight weeks. All groups also received 25g of whey protein isolate and 25g of maltodextrin alongside their supplement. The result? All groups experienced similar, statistically significant increases in fat-free mass. The timing of creatine did not exert any additional influence over any of the measured outcomes, strength, endurance, body composition or isometric force. Evidence grade: Promising (small sample of 34, eight-week duration, though this is a well-designed double-blind RCT).
A narrative review published in *Nutrients* in 2021 looked at the available evidence more broadly and reached a cautious but similar conclusion [9]. While some studies hint at slightly greater benefits when creatine is taken after exercise rather than before, possibly because muscle contractions increase blood flow and may enhance creatine transport, the authors were clear that methodological limitations in the available research prevent solid conclusions. The physiological mechanisms that would justify a strict timing protocol are not yet well established.
A 2022 narrative review in *Frontiers in Sports* went further, examining why the timing question generates so much debate [10]. The review noted that creatine co-ingested with carbohydrates or a carbohydrate-protein mixture can enhance creatine uptake via insulin, suggesting that *what you take creatine with* may matter more than *when* you take it relative to exercise. Insulin enhances creatine transport into muscle cells, which is why taking creatine alongside a meal containing carbohydrates is a reasonable practical strategy.
The morning-versus-evening question was addressed directly in a 2021 single-blind study involving fourteen elite female handball players [12]. One group took creatine in the morning, the other in the evening, over twelve weeks. Both groups showed decreased fat percentage, increased body weight and body water, and improved performance, with results strikingly similar between the groups. The authors concluded that circadian rhythms appear not to meaningfully affect the outcomes of creatine supplementation, because creatine is stored intramuscularly and remains available for high-energy demand regardless of the time of day it was consumed. Evidence grade: Promising (small sample of 14, single-blind design, but findings are consistent with the broader literature).
The practical conclusion, supported by a 2024 international expert narrative review [4]: take your creatine consistently, ideally with a meal containing carbohydrates. The precise window around exercise is a rounding error.
Caffeine is the supplement category where timing unambiguously changes outcomes, and it’s worth understanding why.
Unlike creatine, caffeine works acutely by blocking adenosine receptors in the brain, reducing the perception of effort and fatigue in real time. A 2019 narrative review of ergogenic aids and micronutrient timing, published in the *Journal of the International Society of Sports Nutrition*, confirmed that peri-exercise caffeine consumption, meaning intake timed around the exercise session itself, is one of the clearest cases where timing genuinely influences performance outcomes [11]. A 2023 evidence-based review echoed this, describing “peri-exercise caffeine consumption” as an established strategy for enhancing strength and power through distinct mechanisms [5].
The logic is straightforward: caffeine’s half-life in the body is approximately four to six hours, and its peak plasma concentration occurs around 30 to 60 minutes after ingestion. Take it too early and the effect is waning when you need it; too late and you’re wide awake at midnight. Evidence grade: Strong for caffeine’s acute performance benefits; the timing principle follows directly from basic pharmacokinetics.
For people in the 40–65 age range reading this, the evening caffeine question is particularly relevant. If you’re taking any caffeine-containing supplement, including some pre-workout formulations or energy drinks, and noticing poorer sleep, the timing is almost certainly the issue.
For fat-soluble nutrients, vitamins D, K2, A and E, timing relative to a meal containing fat is genuinely relevant, not because of circadian biology but because of basic absorption chemistry [2]. These vitamins require dietary fat to form micelles in the gut, which is how they’re transported across the intestinal wall. Taking vitamin D on an empty stomach isn’t dangerous, but you’re likely absorbing meaningfully less of it.
A 2023 review of vitamin and mineral supplementation in athletes made this point clearly, noting that “co-consumption of other foods” is one of the factors that impacts the efficacy of a supplementation approach [2, 15]. The same review highlighted that iron absorption is influenced by timing, specifically, the co-consumption of calcium or certain plant compounds can inhibit iron uptake, while vitamin C consumed alongside iron enhances it.
For water-soluble vitamins, B complex, vitamin C, biotin, this concern disappears entirely. Excess is excreted in urine, absorption does not depend meaningfully on meal fat content, and there is no meaningful window to optimise. Take them daily, with or without food, and the job is done. Evidence grade: Strong for fat-soluble vitamin absorption being meal-dependent; consistent with established nutritional biochemistry.
The supplement timing question, when viewed against the broader landscape of what actually drives outcomes, starts to look like a distraction.
A 2025 systematic review and network meta-analysis, the most comprehensive type of evidence synthesis, examined 35 randomised controlled trials involving 991 athletes taking protein, creatine, beta-alanine, HMB, vitamin D, caffeine and other supplements alongside resistance training [1]. The findings were clear about what moves the needle: protein supplementation produced the greatest improvement in muscular strength (SMD = 0.64), beta-alanine and creatine improved jump performance, and creatine specifically reduced sprint time (SMD = -0.42). Notably, no supplement significantly increased lean body mass in isolation. The authors’ recommendation was to “align supplementation strategies with the targeted performance attribute and training phase”, in other words, *what* you take and *why* matters far more than the hour of the day.
The chrono-nutrition review published in 2025 reached a similar conclusion for weight loss [3]: while nutrient timing has some effect on metabolic outcomes, total energy balance, how much you eat overall, remains the dominant variable. Timing is a second-order effect.
This isn’t to say timing is irrelevant. It’s to say that if you’re not yet taking your supplements consistently, at an adequate dose, with appropriate food, the timing question is the least of your worries.
Honesty requires acknowledging that the timing question is genuinely under-researched, especially in populations that are most relevant to cognitive health and healthy ageing.
Almost all the creatine timing research has been conducted in young, trained athletes, not in people aged 40–65 using creatine for cognitive support or muscle preservation [9, 10]. Whether the same “timing doesn’t much matter” conclusion holds for older adults, who have different creatine transport kinetics and different training stimuli, is not yet established.
The chrono-nutrition field, studying how our circadian biology interacts with nutrient absorption and metabolism, is genuinely fascinating and growing fast, but most of its findings are still early stage in terms of practical supplement protocols [3]. We don’t yet have good human trial data telling us, for example, whether vitamin D taken in the morning versus the evening meaningfully affects its effects on immune function or mood.
The multi-ingredient supplement timing question is also largely unexplored. Most timing studies look at single ingredients in isolation [8]. When you’re taking a combination of nutrients, as most supplement users do, the interactions between ingredients, and how timing affects those interactions, is an area where the research is thin.
And while the creatine timing debate has generated a reasonable number of small trials, the sample sizes are consistently modest, the largest study in this area involved 34 participants [14]. We need larger, longer trials before we can be truly confident.
Here’s what a sensible, well-informed person should actually do, no hedging, no hiding behind “consult your doctor before breathing”:
Take your supplements consistently. Full stop. That’s the single most important timing principle.
Once you’ve nailed consistency, here’s where timing genuinely earns its place:
Fat-soluble vitamins (D, K2, E), take with your largest meal of the day, ideally one containing some fat. Not because the clock matters, but because dietary fat is required for proper absorption. Breakfast with eggs, lunch with olive oil, either works. The meal matters, not the hour.
Water-soluble vitamins (B complex, C), take them daily, whenever suits your routine. Excess is excreted, absorption is not fat-dependent, and there is no meaningful window to optimise. Morning works fine. So does evening.
Creatine, take it daily, preferably alongside a meal containing carbohydrates, which enhances uptake via insulin signalling. Pre- or post-workout makes essentially no measurable difference in the research. Morning or evening makes no measurable difference either. The only thing that matters is saturation over time, which requires consistency. If you miss the post-workout window, take it with dinner. Don’t skip it.
Caffeine, this is the one where timing genuinely matters. Take it 30–60 minutes before any task requiring sustained focus or physical performance. And stop it at least six hours before you want to sleep. For most people over 40, that means a hard cut-off around 2pm.
Iron, only supplement if you are deficient. This is the one category where testing actually matters before you start, because excess iron is genuinely harmful. Pay attention to what you take alongside iron: calcium inhibits absorption, vitamin C enhances it.
The real insight from this body of research is liberating rather than complicated: the supplement timing question has been dramatically oversold. Your supplements are not going to fail you because you took them at 9am instead of 11am. They might fail you if you forget to take them entirely because the routine felt too complicated to maintain.
Build a simple, consistent habit. Pair fat-soluble vitamins with meals. Time caffeine sensibly. Take creatine daily. And then stop worrying about the clock.
[1] Effects of different dietary supplements combined with conditioning training on muscle strength, jump performance, sprint speed, and muscle mass in athletes: a systematic review and network meta-analysis (2025). DOI: 10.3389/fnut.2025.1636970 | https://pubmed.ncbi.nlm.nih.gov/40717998/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12295849/
[2] Considerations for the Consumption of Vitamin and Mineral Supplements in Athlete Populations (2023). DOI: 10.1007/s40279-023-01875-4 | https://pubmed.ncbi.nlm.nih.gov/37358750/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10721676/
[3] Calorie counting vs. minute counting; does nutrient timing matter for weight-loss? (2025). https://pubmed.ncbi.nlm.nih.gov/40401907/
[4] Part II. Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show? (2025). DOI: 10.1080/15502783.2024.2441760 | https://pubmed.ncbi.nlm.nih.gov/39720835/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11703406/
[5] Evidence-based nutritional approaches to enhance exercise adaptations (2023). DOI: 10.1097/MCO.0000000000000975 | https://pubmed.ncbi.nlm.nih.gov/37650704/
[6] Dietary Supplements for Health, Adaptation, and Recovery in Athletes (2018). https://pubmed.ncbi.nlm.nih.gov/29345167/
[8] The Effect of a Multi-ingredient Supplement on Resistance Training-induced Adaptations (2021). DOI: 10.1249/MSS.0000000000002641 | https://pubmed.ncbi.nlm.nih.gov/33756525/
[9] Timing of Creatine Supplementation around Exercise: A Real Concern? (2021). DOI: 10.3390/nu13082844 | https://pubmed.ncbi.nlm.nih.gov/34445003/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8401986/
[10] Creatine O’Clock: Does Timing of Ingestion Really Influence Muscle Mass and Performance? (2022). DOI: 10.3389/fspor.2022.893714 | https://pubmed.ncbi.nlm.nih.gov/35669557/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9163789/
[11] Timing of ergogenic aids and micronutrients on muscle and exercise performance (2019). DOI: 10.1186/s12970-019-0304-9 | https://pubmed.ncbi.nlm.nih.gov/31477133/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6721335/
[12] Morning versus Evening Intake of Creatine in Elite Female Handball Players (2021). DOI: 10.3390/ijerph19010393 | https://pubmed.ncbi.nlm.nih.gov/35010653/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8744932/
[13] The effects of pre versus post workout supplementation of creatine monohydrate on body composition and strength (2013). https://pubmed.ncbi.nlm.nih.gov/23919405/
[14] Effects of creatine monohydrate timing on resistance training adaptations and body composition after 8 weeks in male and female collegiate athletes (2022). DOI: 10.3389/fspor.2022.1033842 | https://pubmed.ncbi.nlm.nih.gov/36465581/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9708881/
[15] Considerations for the Consumption of Vitamin and Mineral Supplements in Athlete Populations (2023). DOI: 10.1007/s40279-023-01875-4 | https://pubmed.ncbi.nlm.nih.gov/37358750/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10721676/
This article is for informational purposes only and does not constitute medical advice. Food supplements should not be used as a substitute for a varied and balanced diet and healthy lifestyle. If you are pregnant, breastfeeding, taking medication or have a medical condition, consult your doctor before taking any supplement. These statements have not been evaluated by the Food and Drug Administration (FDA) or the Medicines and Healthcare products Regulatory Agency (MHRA). This product is not intended to diagnose, treat, cure, or prevent any disease.
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