What the evidence supports
Creatine monohydrate is one of the most studied sports supplements. Evidence is strongest for improving capacity during repeated short, high-intensity efforts and supporting gains from resistance training. Results vary and it is not a steroid.
Weight and blood-test context
An early increase in body mass can reflect water held within muscle. Creatine can also influence serum creatinine, a marker used in kidney assessment, without necessarily representing kidney damage; clinicians should know about supplement use when interpreting results.
Product quality still matters
Most evidence concerns creatine monohydrate, not every proprietary form or blend. Supplements can be contaminated or mislabelled, so independently tested single-ingredient products reduce—but do not eliminate—quality uncertainty.
Useful information to track
- Product, form and independent-testing status
- Start date and labelled serving
- Training performance and body-weight context
- Digestive effects and relevant blood-test dates
Sources
Reviewed against the following official guidance and primary evidence. Product information and clinical guidance can change.