Creatine Monohydrate
SupplementLast reviewed on July 15, 2025 by SupStaq
Not medical advice. This content is general, evidence-based information and is not a substitute for professional medical advice, diagnosis, or treatment.
The minimal divergence of 2 points reflects an exceptionally strong agreement between clinical evidence [s1, s2, s3] and user reports [c1, c2, c3]. Creatine is one of the few dietary supplements for which community experiences largely corroborate the scientific data.
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TL;DR
Creatine monohydrate is the most evidence-backed supplement in existence: hundreds of RCTs, multiple meta-analyses, and two approved EFSA health claims consistently confirm significant effects on strength, muscle mass, and high-intensity performance. A daily maintenance dose of 3–5 g is sufficient; a loading phase is optional. Cognitive benefits are real but moderate — vegetarians and vegans see the clearest mental gains. At under €10 per month, no supplement comes close to its evidence-to-cost ratio.
Description
Creatine monohydrate is the best-evidenced supplement for strength, muscle mass, and high-intensity performance; increasingly relevant for cognitive health as well [s1, s2, s3].
Creatine monohydrate is a naturally occurring compound stored in skeletal muscle, heart, and brain as phosphocreatine (PCr) [s1]. In the body, creatine is synthesized endogenously from the amino acids arginine, glycine, and methionine; the primary dietary sources are meat and fish [s1]. Vegetarians and vegans have lower baseline muscle creatine levels (~100 mmol/kg dry muscle mass vs. ~120 mmol/kg in omnivores) and therefore respond to supplementation with greater absolute increases [s8]. Creatine monohydrate is the most extensively studied form; alternative forms such as creatine HCl or creatine ethyl ester show no superior bioavailability or performance benefit in direct comparison studies [s7]. The ISSN designates creatine monohydrate as the safest and most effective supplement for strength and performance athletes [s1]. Beyond physical performance, evidence for cognitive effects is accumulating: a systematic review and meta-analysis from 2024 examined effects on cognitive function in adults; vegetarians and older individuals with low baseline creatine show stronger responses in particular [s5, s8]. In older adults, creatine combined with resistance training significantly improves muscle mass and lower-body strength, thereby counteracting sarcopenic muscle loss [s4, s6]. Long-term studies spanning several years show no adverse effects on renal or hepatic function in healthy adults at recommended doses [s1, s12].
Legal Status (DE)
In Germany, Austria, and Switzerland, creatine monohydrate is freely marketable as an over-the-counter dietary supplement. The EFSA has authorized health claims for physical performance during high-intensity training and for muscle strength in adults over 55 years of age [s10, s11]. The FDA has classified creatine monohydrate as GRAS (Generally Recognized as Safe) [s9].
Mechanism of Action
Creatine is phosphorylated in the muscle cell by creatine kinase and stored as phosphocreatine (PCr). During intense muscle contractions, when ATP is rapidly consumed, PCr donates its phosphate group to ADP, regenerating ATP within milliseconds — this is the fastest anaerobic energy pathway in the body (ATP + creatine ⇌ PCr + ADP, catalyzed by creatine kinase) [s1, s2]. Oral supplementation can increase intramuscular PCr stores by 10–40%, enhancing ATP resynthesis capacity during repeated high-intensity efforts [s2, s3]. This results in improved strength, power output, and recovery between exercise intervals [s1]. In the brain, creatine is likewise an important energy buffer; higher cerebral creatine and PCr levels are associated with improved cognition, particularly during sleep deprivation, mental fatigue, and in individuals with low baseline creatine levels (e.g., vegetarians, older adults) [s5]. Additional proposed mechanisms include osmotic effects (intramuscular water retention), promotion of protein synthesis, and a possible role in mitochondrial biogenesis [s1, s6].
Dosing
Kraftleistung und Muskelmasse (mit Ladephase)
- Dose
- Loading phase: 20 g/day divided into 4 doses of 5 g each for 5–7 days; then maintenance dose 3–5 g/day
- Frequency
- täglich
- Route
- oral
- Duration
- fortlaufend
- Timing
- Loading phase: evenly distributed throughout the day; maintenance phase: timing flexible, optionally post-workout
- With food
- optional
Kraftleistung und Muskelmasse (ohne Ladephase)
- Dose
- 3–5 g/day
- Frequency
- 1× täglich
- Route
- oral
- Duration
- fortlaufend (mindestens 4 Wochen bis zur vollen Aufsättigung)
- Timing
- Timing flexible; post-workout may be slightly advantageous
- With food
- optional
Ältere Erwachsene / Sarkopenie-Prävention kombiniert mit Krafttraining
- Dose
- 3–5 g/day
- Frequency
- 1× täglich
- Route
- oral
- Duration
- mindestens 12 Wochen
- Timing
- Take in close temporal proximity to training
- With food
- empfohlen
Kognitive Funktion (insbesondere Vegetarier/Veganer, ältere Personen)
- Dose
- 3–5 g/day; higher doses (20 g) show stronger cognitive effects in acute studies
- Frequency
- 1× täglich
- Route
- oral
- Duration
- mindestens 4–6 Wochen
- Timing
- Timing not critical
- With food
- optional
The ISSN specifies no absolute upper limit for healthy adults at a maintenance dose of 3–5 g/day [s1]. Loading phases of 20 g/day for 5–7 days are well tolerated [s1, s2]. Long-term intake >10 g/day is less studied; doses of up to 30 g/day over short periods have been used in studies without serious adverse effects [s1].
Micronized creatine monohydrate dissolves more readily and may improve gastrointestinal tolerability. Co-ingestion with carbohydrate- or protein-rich meals can slightly enhance uptake via insulin-mediated transport mechanisms [s1]. Vegetarians and vegans should supplement with creatine, as their baseline levels are considerably lower [s8].
Side Effects
| Side Effect | Frequency | Severity |
|---|---|---|
| Gewichtszunahme durch Wassereinlagerung im Muskel (intrazelluläre Hyperhydratation) Creatine increases osmotic pressure in muscle cells, drawing water into the muscle. Typical increase: 0.5–2 kg in the first weeks, especially during the loading phase [s1]. | häufig | leicht |
| Gastrointestinale Beschwerden (Übelkeit, Blähungen, Durchfall) Occur primarily at high single or daily doses (≥10 g at once). Usually avoidable by splitting the dose and taking with meals [s1, s12]. | gelegentlich | leicht |
| Muskelkrämpfe Mentioned in early reports but not consistently confirmed in controlled studies. The 2025 Frontiers review lists cramps as a potential but poorly substantiated side effect [s12]. | selten | leicht |
| Erhöhte Serumkreatinin-Werte (ohne funktionelle Nierenbeeinträchtigung) Creatine is degraded to creatinine, resulting in elevated laboratory values. This reflects increased creatine metabolism, not true renal damage in healthy individuals [s1, s12]. | häufig | leicht |
| Nierenbelastung (bei vorbestehender Nierenerkrankung) No renal damage was demonstrated in long-term studies in healthy adults with normal renal function [s1, s12]. Caution is advised in pre-existing renal impairment [s12]. | theoretisch | schwer |
Contraindications
Creatine is renally excreted; in impaired renal function, excretory capacity may be overwhelmed. Despite the absence of direct RCT evidence for harm, the ISSN recommends medical consultation in known renal disease [s1, s12].
Theoretical additive renal burden from concomitant use of nephrotoxic substances. Combination should be medically supervised [s12].
The ISSN recommends creatine supplementation in minors only under specific conditions (physically active, balanced diet, parental and medical consent), as long-term data for this age group are limited [s2].
Interactions
Synergistic
Concurrent intake of creatine with carbohydrates or protein modestly increases muscular creatine uptake via insulin-mediated transporter upregulation [s1].
The combination of creatine supplementation and resistance training consistently produces greater gains in strength and muscle mass than either intervention alone [s3, s4, s6].
Theoretically complementary mechanisms (PCr system + buffering via carnosine); mentioned as a reasonable combination in the ISSN review, but specific evidence for synergy is limited [s1].
The combination of creatine and BCAAs/EAAs may support muscle growth and recovery, as creatine increases muscular energy capacity while BCAAs/EAAs stimulate muscle protein synthesis. Both mechanisms are complementary for strength and endurance performance.
Betaine (TMG) is important as a methyl group donor for endogenous creatine synthesis and helps buffer elevated homocysteine levels that may arise with intensive creatine supplementation. The combination may relieve the methylation cycle and support cardiovascular health.
Alpha-lipoic acid improves insulin sensitivity, thereby promoting glucose uptake in muscle cells. Since creatine uptake is insulin-mediated, ALA may potentially optimize creatine loading into muscle.
BPC-157 promotes tissue repair and tendon healing, while creatine optimizes energy supply in muscle. This combination may create a synergistic regenerative environment during injury or intensive training.
Caution
Some older studies reported that high-dose caffeine may attenuate the ergogenic effect of creatine on certain performance parameters. No relevant interactions have been described with moderate caffeine intake (up to 400 mg/day) [s13].
Combined intake is theoretically problematic: diuretics promote water excretion, while creatine favors intracellular water retention. Potential impact on renal function with concurrent use [s13].
Theoretically additive renal burden; creatine should only be used after medical evaluation when nephrotoxic medications are taken regularly [s12].
Studies
Tier A: High Evidence
Outcome: Upper and lower body strength and performance
Effect Size: Significant improvements in bench press/leg press strength and performance parameters vs. placebo
Outcome: Lower body strength and muscle mass in older adults (creatine + resistance training)
Effect Size: Significant improvement in lower body strength and lean tissue mass; no significant effect on upper body strength
Outcome: Cognitive function in adults
Effect Size: Moderate positive effects on cognitive performance, particularly in vegetarians and older individuals
Outcome: Strength, muscle mass, performance, safety
Effect Size: Consistent significant improvements in strength (+5–15%) and muscle mass; long-term safety confirmed
Outcome: Muscle strength and body composition in older adults (creatine + exercise)
Effect Size: Significantly improved muscle strength and lean mass; 69% female participants
Tier B: Moderate Evidence
Outcome: Safety and efficacy, dosing recommendations
Effect Size: Comprehensive evidence base confirms safety and efficacy in athletes and clinical populations
Outcome: Muscle mass, body composition, serum creatine levels
Effect Size: Creatine monohydrate superior to creatine ethyl ester; CEE degrades more extensively to creatinine
Outcome: Cognitive response to creatine supplementation in vegetarians
Effect Size: Vegetarians show significantly greater cognitive improvements (working memory) than omnivores
Tier C: Low Evidence
Outcome: FDA safety assessment
Effect Size: GRAS status confirmed
Outcome: Feasibility and brain creatine levels in Alzheimer's patients
Effect Size: Supplementation was feasible; brain creatine levels elevated; cognitive endpoints exploratory in nature
Community Evidence
Top reported benefits
- Marked strength gains and improved repetition performance in training
- Faster recovery between sets and training sessions
- Visible muscle gains and fuller appearance
- Subtle cognitive improvements (particularly in vegetarians/vegans)
- Good tolerability and favorable cost-to-benefit ratio
Top reported issues
- Water retention and short-term weight gain at the start
- Occasional gastrointestinal discomfort with excessively high single doses
- Cognitive effects not perceptible in all users (especially omnivores)
- Powder clumping upon moisture exposure
Isolated reports of hair loss (DHT hypothesis) are discussed in the community but have not been consistently substantiated in clinical studies [s12]. Some users report no perceptible effects (non-responders), which is attributed to already high baseline creatine levels in meat-eaters [s8]. Long-term users (>10 years) report no abnormalities in regular blood panel monitoring in forum discussions [c1].
Scientific Sources
- Effect of Creatine Monohydrate on Clinical Progression in Patients With Parkinson Disease: A Randomized Clinical Trial
Writing Group for the NINDS Exploratory Trials in Parkinson Disease (NET-PD) Investigators, Kieburtz K, Tilley BC, Elm JJ, et al. (2015). JAMAAPMID:25668262DOI - Allgemeinverfügung nach § 54 LFGB – Nahrungsergänzungsmittel mit Zusatz von Kreatin (BVL 12/01/007)
Bundesamt für Verbraucherschutz und Lebensmittelsicherheit (BVL) (2012). Journal nicht verfügbarBLink - GRAS Notice No. GRN 931: Creatine Monohydrate (Creapure®) – Generally Recognized as Safe Determination
U.S. Food and Drug Administration (FDA) (2020). Journal nicht verfügbarBLink - WADA 2025 List of Prohibited Substances and Methods
World Anti-Doping Agency (WADA) (2025). Journal nicht verfügbarBLink - Creatine and Caffeine: Considerations for Concurrent Supplementation
Trexler ET, Smith-Ryan AE (2015). International Journal of Sport Nutrition and Exercise MetabolismBPMID:26219105 - Creatine monohydrate pilot in Alzheimer's: Feasibility, brain creatine, and cognition
Smith AE, Fukuda DH, Kendall KL, et al. (2025). Alzheimer's & Dementia: Translational Research & Clinical InterventionsBDOI - The Effects of Creatine Supplementation on Cognitive Function in Adults: A Systematic Review and Meta-Analysis
Xu C, Bi S, Zhang W, Luo L (2024). Frontiers in NutritionAPMID:39070254DOI - The Paradoxical Effect of Creatine Monohydrate on Muscle Damage Markers: A Systematic Review and Meta-Analysis
Doma K, Ramachandran AK, Boullosa D, Connor J (2022). Sports MedicineADOI - Risk of Adverse Outcomes in Females Taking Oral Creatine Monohydrate: A Systematic Review and Meta-Analysis
de Guingand DL, Palmer KR, Snow RJ, Davies-Tuck ML, Ellery SJ (2020). NutrientsADOI - A Randomized, Double-Blind, Placebo-Controlled, Proof-of-Concept Trial of Creatine Monohydrate as Adjunctive Treatment for Bipolar Depression
Toniolo RA, Silva M, Fernandes FBF, Amaral JAMSS, Dias RS, Lafer B (2018). Journal of Neural TransmissionADOI - International Society of Sports Nutrition Position Stand: Safety and Efficacy of Creatine Supplementation in Exercise, Sport, and Medicine
Kreider RB, Kalman DS, Antonio J, et al. (2017). Journal of the International Society of Sports NutritionBDOI - Effects of Creatine Monohydrate Loading on Sleep Metrics, Physical Performance, Cognitive Function, and Recovery in Physically Active Men: A Randomized, Double-Blind, Placebo-Controlled, Crossover Trial
Ben Maaoui K, Delleli S, Mahdi N, Jebabli A, Del Coso J, Chtourou H, et al. (2025). NutrientsAPMID:41470776DOI - A Short Review of the Most Common Safety Concerns Regarding Creatine Ingestion
Autor nicht verfügbar (2025). Frontiers in NutritionBDOI - Safety of Creatine Supplementation: Analysis of the Prevalence of Reported Side Effects in Clinical Trials and Adverse Event Reports
Kreider RB, Gonzalez DE, Hines K, Gil A, Bonilla DA (2025). Journal of the International Society of Sports NutritionBDOI
Community Sources
Storage
Unopened
Store dry at room temperature (15–25 °C), protected from light and moisture.
Opened
Seal container tightly after each use; the powder is hygroscopic and will clump upon moisture exposure.
Notes
Creatine monohydrate is chemically stable; hydrolysis to creatinine is minimal in dry powder form. When dissolved in aqueous solution, creatine should be consumed promptly, as it degrades to creatinine in liquid over the course of hours [s7].