Optimal Creatine Intake - Are you taking too little or too much?

Creatine is having another moment — this time framed as a brain supplement, not just a muscle one. You've probably seen clips of podcasters discussing doses in the 10-20 gram range for cognitive benefits. If you're already taking the standard 3-5 grams, it's a reasonable question: are you underdosing?

What they're saying:

Popular podcast clips have highlighted much higher creatine doses — sometimes 10-20 grams — as necessary to unlock cognitive and brain-energy benefits, distinct from the standard dose used for muscle and strength.

What the evidence actually shows:

The well-established, broadly supported dose for creatine's core benefits — strength, exercise performance, mood, and general cognitive support — remains 3-5 grams daily. A comprehensive review of creatine research across women's lifespans found this standard dose effective for strength and exercise performance in premenopausal women, with additional benefits for mood and cognition (Smith-Ryan et al., Nutrients, 2021).

That same review found something genuinely relevant to a 40+ audience: postmenopausal women may see added benefit — specifically to skeletal muscle size and function — from higher doses, around 0.3 grams per kilogram of body weight daily (roughly 18-20 grams for a 150-pound woman), particularly when combined with resistance training (Smith-Ryan et al., Nutrients, 2021). So the higher-dose conversation isn't pure invention — it has a real basis for this specific population and specific outcome.

Here's the most directly relevant piece: someone actually ran this exact experiment in healthy people. A 2023 randomized controlled trial gave healthy young adults either 10 grams/day, 20 grams/day, or placebo for 6 weeks, then tested processing speed, memory, and attention. The result: creatine had no significant effect on cognitive performance at either dose compared to placebo (Moriarty et al., Brain Sciences, 2023). This is the closest thing to a direct test of "does a higher daily dose sharpen a healthy brain," and in this trial, it didn't outperform placebo at all — let alone show a 20g-over-10g advantage.

That said, the broader picture on creatine and memory in healthy people isn't zero. A 2022 meta-analysis pooling 8 randomized trials found creatine supplementation did improve memory performance in healthy individuals overall, with the benefit concentrated almost entirely in older adults (ages 66-76); younger adults showed essentially no effect. Notably, the dose used across these pooled studies — ranging from about 2.2 to 20 grams per day — did not influence how much benefit people saw (Prokopidis et al., Nutrition Reviews, 2022). In other words, even where a real benefit shows up in healthy people, it's tied to age, not to how high the dose goes.

There is another interesting higher-dose brain study behind some of this discussion — but it comes with important context. A 2025 pilot trial gave 20 grams of creatine monohydrate daily for 8 weeks to 20 patients with Alzheimer's disease, and found it feasible, well-tolerated, and associated with an 11% increase in brain creatine along with measurable improvements on several cognitive tests (Smith et al., Alzheimer's & Dementia: Translational Research & Clinical Interventions, 2025). That's a real, notable data point for high-dose creatine and cognition — but it's a small pilot study (20 people) specifically in Alzheimer's patients, not a study of healthy midlife adults looking for a cognitive edge. The researchers themselves note that larger trials are still needed to establish efficacy and the optimal dose.

Separately, a different high-dose study looked at healthy adults rather than a clinical population — but under a specific stress condition. A single large dose of creatine (0.2 g/kg — about 14-18 grams) improved cognitive performance in healthy adults who'd been kept awake for 21 hours straight, reducing the deterioration in logical reasoning, processing speed, and vigilance that sleep deprivation normally causes (Gordji-Nejad et al., Nutrients, 2026). This is useful information in its own right, but it tested a one-time acute dose during severe sleep deprivation — not a daily brain-boosting protocol for a well-rested person.

Here's where it's worth pausing: both the Alzheimer's pilot and the sleep-deprivation study get cited in popular content as general evidence that "everyone" benefits from high-dose creatine for brain function — but neither one actually tested that, and the one trial that did test daily high-dose creatine in healthy adults (Moriarty et al.) found no benefit at all. One study is a small pilot in people with a neurodegenerative disease that already involves impaired brain energy metabolism, where creatine may be correcting a specific deficit. Another is healthy adults, but only under an acute, extreme stressor most people aren't experiencing on a given Tuesday. Extrapolating "20 grams helped Alzheimer's patients" or "a high dose helped sleep-deprived people" into “healthy 45-year-olds should take 20 grams daily for brain health" skips over the fact that a diseased or acutely stressed brain doesn't necessarily respond the same way as a healthy, rested one — and the direct test of that specific claim came back negative.

What this means for you:

3-5 grams daily remains a solid, evidence-backed baseline for the muscle, mood, and general cognitive benefits most people are after. If you're postmenopausal and focused specifically on muscle size and bone-supportive training, a higher daily dose has some research behind it — worth a conversation with your coach or doctor. If you're an older adult (66+) hoping for a memory benefit, standard-dose creatine has real support behind it too — but going higher than standard doses hasn't shown added benefit in the actual research, including the one trial built to test that question directly. The Alzheimer's and sleep-deprivation studies are genuinely interesting, but they don't add up to "healthy adults should take 20 grams for brain benefits" — that's a different question, and the closest direct test we have says no. If your current supplement routine doesn't quite match what the evidence actually supports for your goals, that's worth sorting out rather than guessing. If you need someone to bounce supplementation questions off of connect with me below and I can help you out or point you in the direction of someone who can.

References

• Smith-Ryan AE, Cabre HE, Eckerson JM, Candow DG. Creatine Supplementation in Women's Health: A Lifespan Perspective. Nutrients. 2021;13(3):877.

• Moriarty T, Bourbeau K, Dorman K, et al. Dose-Response of Creatine Supplementation on Cognitive Function in Healthy Young Adults. Brain Sciences. 2023;13(9):1276.

• Prokopidis K, Giannos P, Triantafyllidis KK, Kechagias KS, Forbes SC, Candow DG. Effects of Creatine Supplementation on Memory in Healthy Individuals: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Nutrition Reviews. 2022;81(4):416-427.

• Smith AN, Choi IY, Lee P, Sullivan DK, Burns JM, Swerdlow RH, et al. Creatine Monohydrate Pilot in Alzheimer's: Feasibility, Brain Creatine, and Cognition. Alzheimer's & Dementia: Translational Research & Clinical Interventions. 2025;11(2):e70101.

• Gordji-Nejad A, Matusch A, Hengstler L, Beer S, Kroll T, Klein S, et al. Single-Dose Creatine Reduces Sleep Deprivation-Induced Deterioration in Cognitive Performance. Nutrients. 2026;18(8):1192.

This article summarizes peer-reviewed research and does not constitute medical advice. Supplement decisions should account for individual health history, kidney function, and medications — consult a physician before starting or changing a supplement regimen.