Evidence overview
Creatine
Creatine monohydrate is the most-studied performance supplement, with hundreds of randomized trials dating to the early 1990s. The bulk of the literature centers on short-duration high-intensity exercise outcomes, with a smaller but rapidly growing research base on cognition, recovery, aging, and clinical applications. Among consumer supplements, the evidence base here is unusually deep.
Most studied for
Coverage pending
PubMed coverage
Coverage pending
Safety profile
In your full report
Mechanism class
Stored in muscle and brain as phosphocreatine, providing rapid phosphate donation for ATP regeneration...
Study coverage
Study coverage by goal
PubMed counts for Creatine grouped by the goal each study targets.
Evidence overview is temporarily unavailable for Creatine.
Evidence
What the evidence covers
The terrain of the published literature, not its conclusions.
Creatine works by donating phosphate to regenerate ATP during short, high-intensity efforts (sprinting, jumping, heavy lifting, repeated efforts under fatigue). The dominant supplemental form in the literature is creatine monohydrate by a wide margin; alternative forms such as HCl, buffered (Kre-Alkalyn), and ethyl ester have thinner research bases, and head-to-head comparisons generally do not show superiority over monohydrate.
The outcome dimensions covered most heavily are strength and power, lean mass and hypertrophy, sprint and repeated-effort performance, and recovery from exercise-induced damage. Cognitive outcomes (particularly under sleep deprivation, mental fatigue, or vegetarian baseline) are an actively expanding area, as is supplementation in older adults for sarcopenia and in clinical contexts such as neuromuscular conditions and traumatic brain injury. "Water weight" interpretations of early-cycle mass gains are a common source of confusion and are addressed in the personalized report.
Demographically, the early literature was dominated by young trained males. Recent decades have substantially broadened the participant pool to include women, older adults, and clinical populations. Baseline dietary intake matters: vegetarians and vegans typically show larger relative responses than omnivores because their baseline muscle creatine stores are lower. Sex differences in response magnitude exist but are smaller than the popular framing suggests.
Safety
Safety summary
Common adverse events, drug interactions, and special populations.
Creatine is generally well-tolerated. The most-reported adverse events are bloating and gastrointestinal discomfort, primarily at high loading doses; spreading the dose across the day or skipping the loading phase typically resolves them. Kidney function has been the focus of repeated investigation across decades of trials. In people with healthy baseline kidney function, no signal of harm has emerged across short-term and multi-year follow-ups. Individuals with pre-existing kidney disease should consult a clinician before supplementing. Serum creatinine rises modestly during supplementation as a normal biochemical artifact of higher creatine stores, not as a sign of renal stress; this can confuse routine lab interpretation if your provider is not informed you are supplementing. Source guidance includes the International Society of Sports Nutrition position stand on creatine.
This summary is informational and not medical advice. Consult a clinician before starting or changing any supplement, especially if you take prescription medications.
Foundations
Foundation of the evidence base
A few studies the field anchors on. Not the full picture, just the starting points.
Broad supplement-level synthesis covering creatine's roles beyond pure performance - including health, injury recovery, and chronic-disease applications. Serves as the field's reference document when creatine is discussed at the supplement-overall level rather than within a single goal.
View on PubMedRecent comprehensive synthesis on creatine and kidney function - the most-asked safety question for the supplement. Establishes the current evidence-based answer to "is creatine safe for my kidneys?" which is the safety concern that consumers and clinicians most often raise.
View on PubMedGRADE-assessed pooled-evidence document on creatine's effects on body composition, published in the ISSN's own journal. The combination of GRADE methodology, dose-response analysis, and ISSN authorship makes this a current field anchor for creatine's primary established use.
View on PubMed
Limitations
What this page doesn't answer
Where the public summary stops and the personalized report begins.
This page covers the creatine evidence in general terms. It does not address optimal dosing for your training context, loading versus maintenance protocols for your situation, whether you would benefit more or less than average given your baseline diet (vegetarian versus omnivore matters), or how creatine fits with other supplements you may be taking. The personalized report incorporates those details to surface the trial subgroups most relevant to your profile.
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