BioSignal Scientific Trust StandardContinuously reviewed using the BioSignal Scientific Evaluation Framework
View MethodologyCreatine
Creatine Monohydrate
Creatine is a naturally occurring compound central to short-term muscle energy, and creatine monohydrate is among the most well-supported supplements for strength and high-intensity performance.
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Jump to the part of this record most relevant to your question. These are guides to information, not recommendations.
How confident is BioSignal?
One overall judgement, then the independent dimensions behind it — each on the same scale.
For increasing strength, power, and high-intensity performance, creatine monohydrate is among the most well-supported supplements. Confidence is lower for broader claims such as cognition, healthy aging, and clinical uses.
Biological Role
High confidenceCreatine's role in regenerating ATP via the phosphocreatine system is well established in foundational biochemistry.
Human Evidence
High confidenceA large body of human research supports creatine's effects on strength and high-intensity performance, especially with resistance training.
Supplement Benefit
High confidenceBenefits for strength, power, and lean mass are consistent across many studies for the monohydrate form.
Safety Confidence
High confidenceCreatine monohydrate is one of the most studied supplements and is generally reported as safe and well tolerated in healthy people at common doses.
Research Activity
HighCreatine remains an active research area spanning performance, aging, cognition, and clinical contexts.
BioSignal Bottom Line
The honest shape of the evidence in five parts — what we know, what we think, what we don't, what's being studied, and what could change our view.
What We Know
Creatine is central to short-term energy supply in muscle, and monohydrate is a well-studied, effective supplement form.
What We Think
Creatine monohydrate reliably supports strength, power, and high-intensity performance, particularly alongside resistance training.
What We Don't Know
The extent of benefits beyond performance — cognition, healthy aging, and clinical uses — is not yet established.
Active Research
Research is exploring creatine in cognition, brain health, older adults, and a range of clinical contexts.
What Could Change Our Mind
Large, long-term trials in non-athletic and clinical populations could expand or temper confidence in creatine's broader benefits.
Does it work?
The most common public claims about NAD+, each weighed against the current evidence — what's supported, what's mixed, and what isn't established.
“Creatine increases strength and power”
Consistently associated with improvements in strength and high-intensity performance, especially when combined with resistance training.
SupportedHigh confidence“Creatine increases muscle mass”
Often associated with gains in lean body mass, reflecting a mix of increased intracellular water and enhanced training adaptations.
SupportedModerate confidence“Creatine improves endurance performance”
Effects on aerobic/endurance performance are less consistent than for short, high-intensity efforts.
Mixed EvidenceModerate confidence“Creatine improves cognition”
Some studies suggest possible cognitive effects in specific contexts (e.g. sleep deprivation), but a general effect in healthy people is not established.
Insufficient EvidenceLimited evidence“Creatine causes hair loss”
A single small study reported a change in a hormone marker; hair loss itself has not been established as an effect in controlled research.
Not EstablishedLimited evidence“Creatine damages the kidneys”
In healthy individuals, creatine at common doses has not been shown to impair kidney function. Caution is warranted for people with pre-existing kidney disease.
Not EstablishedLimited evidence“Creatine causes cramping and dehydration”
Controlled studies have generally not supported increased cramping or dehydration; some evidence points the other way.
Not EstablishedLimited evidence
Practical takeaways
The current evidence, distilled to five points.
- Creatine monohydrate is among the most evidence-backed supplements for strength and power.
- It works by increasing muscle phosphocreatine, aiding short, high-intensity efforts.
- It is generally safe and well tolerated in healthy people at common doses.
- Benefits for cognition and clinical uses are not yet established.
- Monohydrate is the standard, most-studied form.
Dosages used in human studies
The doses researchers have actually studied — summarised for understanding, not as guidance.
| Population | Intervention | Dose | Duration | Primary Outcome | Study Notes |
|---|---|---|---|---|---|
| Healthy adults | Oral creatine monohydrate (loading) | ~20 g/day (4 × 5 g) | 5–7 days | Muscle creatine saturation | Common loading protocol; optional |
| Healthy adults | Oral creatine monohydrate (maintenance) | ~3–5 g/day | Weeks to months | Strength, power, lean mass | Most studied maintenance dose |
| Older adults | Creatine + resistance training | ~3–5 g/day | Weeks to months | Muscle mass, strength, function | Typically combined with training |
| Vegetarians | Oral creatine monohydrate | ~3–5 g/day | Weeks | Baseline creatine stores | Larger relative increases reported |
BioSignal Note. These protocols summarise doses used in published human research. They are provided for educational purposes and should not be interpreted as treatment recommendations.
What kinds of evidence exist?
A high-level view of the current evidence landscape by category. Counts are intentionally unquantified until sourcing is complete.
- Prototype
Human Studies
Hundreds of controlled trials in people, concentrated in strength and high-intensity performance.
- Prototype
Mechanistic Evidence
The phosphocreatine/ATP energy system is characterised in foundational biochemistry.
- Prototype
Preclinical Evidence
Animal and in-vitro studies of creatine metabolism and cellular energetics.
- Prototype
Systematic Reviews
Meta-analyses and a standing ISSN position stand synthesise performance and safety literature.
- Prototype
Research Activity
Ongoing trials in cognition, healthy aging, and clinical applications.
How did we get here?
The chronological arc of how scientific understanding evolved, from foundational biology to current clinical research.
Foundational Biochemistry
Creatine and the phosphocreatine system were established as central to rapid cellular energy supply.
Ergogenic Research Era
Studies established creatine monohydrate as an effective aid for strength and high-intensity performance.
Safety & Broader Applications
Accumulating research supported safety in healthy people and began exploring wider uses.
Current Research
Ongoing work investigates cognition, brain health, aging, and clinical applications.
Understand the science in detail
Deeper explanations and FAQs — definitions, mechanisms, and how the science is studied. Open any question to go further.
Creatine is a compound made naturally in the body (and obtained from foods like meat and fish) that helps supply rapid energy to cells, especially muscle. As a supplement, it is most commonly taken as creatine monohydrate.
Creatine is stored in muscle largely as phosphocreatine, which helps regenerate ATP — the cell's immediate energy currency — during short, intense efforts. Supplementing raises phosphocreatine stores, supporting repeated high-intensity work.
Research spans biochemical and cellular studies of the phosphocreatine system, performance trials measuring strength/power/lean mass (often with resistance training), and a growing set of studies exploring cognition and clinical uses. Study populations and protocols vary, which affects how results compare.
Creatine monohydrate is the standard, most-studied, and most cost-effective form. Alternative forms are marketed, but they generally lack evidence of superiority over monohydrate for effectiveness.
A short higher-dose 'loading' phase can saturate muscle stores faster, but a steady lower daily dose reaches the same saturation over a few weeks. Loading is optional and a matter of how quickly saturation is desired. This is educational information, not a recommendation.
Is it safe?
What is reasonably known, kept clearly separate from what remains uncertain or warrants caution.
What's reasonably known
Known Safety Profile
Creatine monohydrate is one of the most extensively studied supplements and is generally reported as safe and well tolerated in healthy people at common doses.
Commonly Reported Issues
- Short-term water retention / weight gain
- Occasional gastrointestinal discomfort (often with high single doses)
What's uncertain or warrants caution
Long-Term Unknowns
Very long-term effects over many years, and effects in some clinical populations, are less fully characterised.
Populations Requiring Caution
- People with pre-existing kidney disease (consult a clinician)
- People who are pregnant or breastfeeding (limited data)
- Adolescents (limited long-term data)
- People taking medications that affect the kidneys
Evidence Limitations
Much research has been conducted in younger, trained males; generalisability to other groups varies. The common belief that creatine harms the kidneys is not supported in healthy individuals, but caution applies with pre-existing kidney disease.
Educational information only. Not medical advice.
What do scientists agree on?
Where the science is settled, where it is genuinely contested, and where it is still open.
Broad Agreement
Strongly supported by consistent evidence.
- Creatine monohydrate increases muscle phosphocreatine stores.
- It improves strength and high-intensity/power performance, especially with resistance training.
- It is generally safe and well tolerated in healthy adults at common doses.
Active Debate
Evidence is mixed or experts disagree.
- The magnitude of benefit for aerobic/endurance performance.
- Whether creatine meaningfully improves cognition in healthy people.
- The relevance of newer creatine forms versus the standard monohydrate.
Unknowns
Important questions that remain unanswered.
- Long-term effects over many years and in clinical populations.
- Therapeutic potential in neurological and aging contexts.
- Why some individuals appear to respond less than others.
What remains unknown?
The questions the current evidence cannot yet answer — and what it would take to answer them.
- Does creatine produce meaningful cognitive benefits in healthy people?
- What are the long-term effects of continuous use over years?
- Which protocols are optimal for older adults and clinical uses?
- What explains apparent responders versus non-responders?
Large, long-term trials in non-athletic and clinical populations could expand or temper confidence in creatine's broader benefits.
Connected Science
How this record connects to the wider science. Each node will open its own Signal Record as the graph grows.
The beginning of the BioSignal Knowledge Graph — interactive graph view coming in a future sprint.
Evidence & References
Every reference below was verified to its source during scientific review. Links open the original study.
International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine
Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show?
Bioavailability, efficacy, safety, and regulatory status of creatine and related compounds: a critical review
The effects of creatine supplementation on upper- and lower-body strength and power: a systematic review and meta-analysis
Effect of creatine supplementation during resistance training on lean tissue mass and muscular strength in older adults: a meta-analysis
Effects of creatine supplementation on cognitive function of healthy individuals: a systematic review of randomized controlled trials
Effects of creatine supplementation on renal function: a systematic review and meta-analysis
Version History
Every Signal Record evolves as the science evolves. Changes are tracked here.
First published Signal Record for the Alpha launch, distilled from Gold Standard Record #001. Verified references attached. Future versions will track scientific updates, evidence changes, and review history.