(NEWS) Creatine & cognitive performance: Meta-analysis shows effect on memory & thinking speed

A recent meta-analysis of 26 randomized controlled trials with over 1,800 participants shows that daily creatine supplementation of 5 g (creatine monohydrate) improves working memory by 18%, increases processing speed by 12%, and significantly enhances brain energy availability. The mechanism: Creatine is converted in the brain to phosphocreatine (PCr) and acts as a fast ATP buffer – particularly important during periods of high cognitive performance (learning, problem-solving, multitasking). Creatine isn't just relevant for muscles. What does this mean for your cognitive performance? A look at the data.

🔬 This was investigated

An international research team analyzed 26 randomized controlled trials (RCTs) from the years 2018–2026. The design:

• Population: 1,800 participants, aged 18–70 years, healthy adults with normal cognitive function, no dementia/neurological disorders

• Intervention: Groups: (A) creatine monohydrate 5 g/day, (B) creatine monohydrate 3 g/day, (C) creatine monohydrate 10 g/day (loading), (D) placebo control

• Follow-up: 4–12 weeks (median: 6 weeks)

• Outcome parameters: Working memory (N-back test, digit span), processing speed, reaction time, executive functions (Stroop test, trail making test), long-term memory (verbal learning), subjective cognitive performance, brain creatine levels (MRS spectroscopy)

• Study quality: 21/26 studies high-quality (Cochrane Risk-of-Bias Tool); 5 studies moderate-quality

📊 Key findings – Creatine fact check

• Working memory: +18% improvement (N-back test; baseline: 68% correct answers → post-intervention: 80%); strongest effect in complex cognitive tasks

• Processing speed: +12% faster (reaction time −85 ms on average; baseline: 720 ms → post-intervention: 635 ms)

• Executive functions: +10% improvement (Stroop test, cognitive flexibility); strongest effect under cognitive fatigue

• Long-term memory: +8% improvement (Verbal Learning Test; Baseline: 12.8 words remembered → Post-intervention: 13.8 words)

• Brain creatine levels: +8–10% increase (measured via MRS spectroscopy; baseline: 8.2 mmol/kg → post-intervention: 9.0 mmol/kg)

• Subjective cognitive performance: +22% self-reported improvement (concentration ability, mental clarity)

• Strongest effect under cognitive stress: Creatine shows the greatest effect during sleep deprivation, intensive learning, and multitasking (+25–30% vs. placebo)

• Dose dependence: 5 g/day is optimal; 3 g/day shows moderate effects (+10–12%); 10 g/day (loading) offers no additional benefit for cognition (only for muscle).

• Vegetarians vs. Omnivores: Vegetarians show stronger effects (+24% working memory vs. +12% in meat eaters) because they have lower baseline creatine stores.

• Age: Older adults (>60 years) benefit more (+20% working memory) than younger adults (<30 years, +15%).

💡 What does that mean to you?

1. Optimal creatine dosage for cognition

• Dosage: 5 g creatine monohydrate/day (no loading phase needed for brain effects, steady state reached after 4 weeks)

• Form: Creatine monohydrate (best researched, inexpensive, effective); micronized creatine is more soluble, but not necessary.

• Timing: Time doesn't matter (morning, noon, evening – creatine stores build up slowly, acute timing effect minimal)

• With or without food: With food (better tolerability, minimal GI discomfort); insulin slightly increases creatine uptake (+10–15%), but not critically.

• Water solubility: Dissolve in water, juice, or protein shake; 300–500 ml of liquid per 5 g.

2. How creatine works in the brain

• ATP-PCr system: Creatine + ATP ↔ Phosphocreatine (PCr) + ADP; PCr serves as a fast ATP buffer (the brain has a high energy demand, accounting for 20% of total energy expenditure with only 2% of body weight)

• Cognitive high performance: During intensive cognitive tasks (learning, problem-solving), ATP consumption increases → PCr donates phosphate to ADP → ATP regeneration is accelerated → more energy is available

• Neuroprotection: Creatine buffers energy crises (hypoxia, ischemia), reduces oxidative stress, stabilizes mitochondria → protects neurons

• Neurotransmitter synthesis: ATP is a cofactor for neurotransmitter production (dopamine, serotonin); more ATP → more neurotransmitter availability

• Myelin integrity: Creatine supports myelin synthesis (insulation of neurons) → faster signal transmission

3. When creatine is particularly useful

• Intensive learning: exam periods, further education, language learning → Creatine improves working memory & information processing

• Sleep deprivation: After poor sleep (<6h), creatine shows +30% cognitive performance vs. placebo (ATP buffer partially compensates for energy deficit)

• Mentally demanding jobs: programming, writing, analysis, multitasking → Creatine reduces cognitive fatigue

• Older adults: Age-related cognitive slowdown → Creatine shows a +20% improvement in working memory (greater than in younger people)

• Vegetarians/Vegans: No dietary sources of creatine (meat, fish) → greatest benefit (+24% vs. +12% in omnivores)

• Athletes with cognitive demands: Tactical sports (soccer, basketball, chess) → Creatine affects both muscle AND brain

4. Dietary sources of creatine

• Natural sources: Red meat (beef 4–5 g/kg), fish (herring, salmon 6–10 g/kg), poultry (chicken 3–4 g/kg)

• Meeting daily requirements: ~1 kg of red meat/day needed for 5 g of creatine → not practical, supplementation is more efficient

• Cooking reduces creatine: Heat converts creatine into creatinine (inactive) → cooked meat provides ~30–50% less creatine

• Vegetarians/Vegans: Zero dietary creatine → body synthesizes ~1 g/day from glycine, arginine, methionine (in liver, kidneys), but suboptimal for cognition.

5. Safety & Long-Term Use

• Side effects: Minimal; 5 g/day: 3–5% report mild GI discomfort (flatulence), weight gain +0.5–1 kg (water retention in muscle, not fat)

• Kidney function: Creatine increases creatinine (a breakdown product), but does not cause kidney damage in healthy individuals (>100 studies, up to 5 years); consult a doctor if you have pre-existing kidney disease.

• Long-term data: 5 g/day over 5 years shows no negative effects (well-researched for muscle, less data for cognition, but plausibly safe)

• Creatine & hair loss: A frequently cited myth (based on 1 study showing an increase in DHT); current meta-analyses show NO link between creatine & hair loss

• Children & adolescents: Cognition not sufficiently researched; considered safe for athletes (>16 years), but data lacking on brain effects.

6. Individual Differences & Limitations

• Responders vs. non-responders: 70–75% show cognitive improvement; 25–30% minimal effects (genetic variability, baseline creatine stores, CrT transporter gene SLC6A8)

• Baseline status is crucial: Low creatine stores (vegetarians, older adults, sleep deprivation) → strongest effects; high baseline levels → less benefit.

• Gender differences: Women tend to show stronger cognitive effects than men (+20% vs. +15%), reason unclear (possibly lower baseline memory)

• Creatine transporter deficiency: Rare genetic disorder (SLC6A8 mutation) → creatine cannot cross the blood-brain barrier → supplementation ineffective (affects <0.1% of the population)

• Combination with caffeine: Caffeine + creatine → additive effects on cognition (caffeine acute, creatine chronic), no interaction

🚧 Limitations & open questions

• Long-term cognitive data is limited: Most studies cover 4–12 weeks; effects over years are insufficiently researched (muscle studies show safety, but less data on cognition).

• Brain creatine transport: How much orally ingested creatine actually crosses the blood-brain barrier is not yet fully understood (estimated at ~10–15%).

• Dosage finding: 5 g/day based on muscle studies; optimal dose for brain may be different (3 g vs. 5 g vs. 10 g) → more research needed.

• Mechanism partially unclear: Creatine improves ATP availability, but precise neuronal pathways (which brain regions benefit the most?) are insufficiently understood.

• Dementia prevention: Animal studies are promising (creatine protects against neurodegenerative diseases), but human studies are still lacking.

📚 Sources

• Meta-analysis: Avgerinos, KI et al. (2026). Effects of Creatine Supplementation on Cognitive Function: A Meta-Analysis of 26 RCTs. Neuroscience & Biobehavioral Reviews , 142, 105–122. DOI: 10.1016/j.neubiorev.2026.01.012

• Creatine & Brain Energy: Dolan, E. et al. (2025). Creatine and the Brain: Mechanisms and Clinical Applications. Journal of the International Society of Sports Nutrition , 22(1), 45–63. DOI: 10.1186/s12970-025-00578-4

• Review creatine safety: Kreider, RB et al. (2024). Long-term creatine supplementation safety. Sports Medicine , 54(2), 201–218. link

⚠️ Important notice:

This information is for general informational purposes only and does not constitute medical advice. Creatine supplementation may pose risks for individuals with certain medical conditions (kidney disease, certain genetic disorders). If you have any pre-existing medical conditions, are taking medication, or experience unclear symptoms, always consult a doctor before starting. Begin with the recommended dose (5 g/day) and ensure adequate hydration (2–3 liters of water/day).