Creatine
Most well-researched sports supplement, now recognized for cognitive benefits and healthy aging support.
Evidence Summary
Creatine monohydrate is among the most extensively studied supplements, with hundreds of trials supporting muscle and strength benefits and a growing evidence base for cognition and healthy aging. A 2025 meta-analysis of 8 RCTs (482 aged adults; European Review of Aging and Physical Activity) found that adding creatine to resistance training modestly improved lean tissue mass (SMD 0.27, 95% CI 0.02 to 0.53) and lower-limb strength (SMD 0.29, 95% CI 0.00 to 0.57) versus resistance training alone, with larger effects in shorter, more intensive programs. A 2024 meta-analysis in Frontiers in Nutrition reported a significant memory benefit (SMD 0.31, 95% CI 0.18 to 0.44) and faster processing and attention times, while overall global cognition was not significantly changed. A 2025 Nutrition Reviews systematic review of cognition in older adults (6 studies, 1,542 participants aged 66 to 76) found 5 of 6 studies reported positive cognitive associations, though overall certainty remains limited. The safety profile remains excellent at standard doses, and the historical kidney concern has not been borne out in healthy individuals.
Evidence Scale
Mechanism of Action
Creatine increases intramuscular phosphocreatine, buffering ATP resynthesis during high-intensity effort and supporting training adaptations in muscle strength and lean mass. The same phosphocreatine energy system operates in the brain, where supplementation raises cerebral creatine and may support cognition under metabolic stress such as aging, sleep deprivation, or low dietary intake. Additional proposed effects include support for bone and cellular energy metabolism and possible neuroprotection.
Who Is This For?
Muscle building, strength, cognitive support, vegetarians, aging population. Universal benefit.
Protocol & Dosing
Dose
3 to 5 g creatine monohydrate daily for muscle and general use. Optional loading: about 20 g/day split into 4 doses for 5 to 7 days. Cognitive-focused research has explored higher doses (up to about 10 g/day); discuss with your physician.
Frequency
Daily
Duration
Ongoing
Protocol Summary
Creatine monohydrate is the most-studied and most cost-effective form; specialty forms offer no proven advantage. A daily maintenance dose of 3 to 5 g is standard; an optional 5 to 7 day loading phase (about 20 g/day split into 4 doses) speeds saturation. Timing is flexible. Benefits accrue with consistent daily use alongside resistance training; vegetarians and older adults may see the largest relative gains. Higher doses are being studied for cognitive endpoints.
Latest Evidence
2024-2026: creatine for muscle and brain
Two 2024 to 2025 meta-analyses sharpen the case for creatine in healthy aging. In 8 randomized trials of 482 older adults (European Review of Aging and Physical Activity, 2025), adding creatine to resistance training modestly improved lean tissue mass (SMD 0.27) and lower-limb strength (SMD 0.29) beyond training alone, with the largest gains in shorter, more intensive programs.
On the brain side, a 2024 meta-analysis in Frontiers in Nutrition found a significant memory benefit (SMD 0.31, 95% CI 0.18 to 0.44) and faster attention and processing-speed times, while global cognition overall was not significantly changed. A 2025 Nutrition Reviews systematic review in adults aged 66 to 76 found 5 of 6 studies reported positive cognitive associations, though the authors rated overall certainty as limited. Monohydrate at 3 to 5 g/day remains the standard, with an excellent long-term safety profile.
Educational information, not medical advice. These are meta-analytic and trial data about populations; individual results vary and supplementation should be discussed with a qualified physician. Creatine is not appropriate for people with severe kidney disease.
Meta-analyses - 2024-2025 - SMD vs placebo
Creatine's measured effect on muscle and memory
Source: Liu et al., European Review of Aging and Physical Activity (2025), 8 RCTs in aged adults; and Luo et al., Frontiers in Nutrition (2024), pooled cognitive RCTs. Standardized mean differences (higher = greater benefit) vs placebo/control; bars show 95% confidence intervals. Meta-analytic estimates, not individual guarantees.
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Key references: Creatine + resistance training on strength and lean mass in the aged - European Review of Aging and Physical Activity (2025) · Creatine supplementation and cognitive function: a meta-analysis - Frontiers in Nutrition (2024) · Creatine and Cognition in Aging: a systematic review - Nutrition Reviews (2025)
Interactions & Precautions
Contraindications
- Severe kidney disease
Potential Risks
- •Water retention
- •Kidney myth debunked
Potential Side Effects
Practitioner Notes
Clinical annotations from Dr. Goel
Monohydrate is the gold standard; no need for pricier forms. Especially valuable for vegetarians and aging adults for muscle, strength, and cognitive support. Safe long-term at standard doses. Pair with resistance training for best results. Key references (2024 to 2025): Liu et al., Eur Rev Aging Phys Act 2025 (doi:10.1186/s11556-025-00392-9); Luo et al., Front Nutr 2024 (doi:10.3389/fnut.2024.1424972); Marshall et al., Nutr Rev 2025 (doi:10.1093/nutrit/nuaf135).
Dr. Sanjeev Goel
Chief Medical Officer, Peak Human
Cost & Access
Cost Range
$
Accessibility
Availability varies by location
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