Introduction
Creatine is one of the most studied supplement ingredients in sport and exercise research.
This page summarizes **general safety context** from cited sources. It does not replace
advice from a qualified healthcare professional.
What research summaries commonly report
According to NIH consumer-oriented materials, creatine supplementation has been studied
in healthy adults for weeks, months, and longer periods in research settings. Commonly
discussed effects include **weight gain related to water retention** and occasional
**digestive discomfort** or **muscle cramping** in some individuals.
An International Society of Sports Nutrition position stand (cited below) reviews short-
and longer-term supplementation studies in various populations. Individual tolerance and
medical context vary.
Hydration and kidney questions
People sometimes ask about hydration or kidney function. NIH materials focus on general
safety in healthy adults in research contexts; they are not a substitute for medical
evaluation. If you have **kidney disease** or related conditions, consult a qualified
healthcare professional before using creatine.
Who should consult a healthcare professional first
Seek professional guidance before use if you are:
- Pregnant or nursing
- Under 18
- Taking prescription medications
- Managing diabetes, kidney disease, or other chronic conditions
What creatine supplements are not
Dietary supplements are not FDA-approved to mitigate disease. SuppCheckr does not describe
creatine as a medical therapy. Avoid products whose marketing implies disease treatment or
unrealistic outcome promises.
Reporting problems
According to FDA materials, consumers and healthcare professionals can report serious
adverse events associated with dietary supplements through FDA's safety reporting systems.
See FDA dietary supplement resources for current reporting instructions.