Creatine is one of the most extensively studied dietary supplements, with decades of research examining its effects on strength, exercise performance, muscle mass, recovery, and other areas of health. Despite its well-established safety profile in healthy adults, questions about creatine and kidney health remain common.
One of the most frequent questions is: Can creatine cause kidney stones?
Part of the concern comes from confusion between creatine and creatinine. Creatinine is a breakdown product formed from creatine and phosphocreatine and is commonly measured in blood tests used to assess kidney function. Because creatine supplementation can modestly increase serum creatinine in some people, the change may be misinterpreted as evidence of kidney stress or damage.
Current evidence does not indicate that recommended creatine supplementation impairs kidney function in healthy adults. However, research specifically examining creatine supplementation and kidney stone formation is much more limited. Based on available evidence, creatine has not been established as a cause of kidney stones in healthy individuals.
Below, we break down what the research says about creatine, kidney function, hydration, kidney stone risk, and when it may be appropriate to discuss supplementation with a healthcare professional.
What Are Kidney Stones?
Kidney stones are hard mineral deposits that form inside the kidneys when certain substances in urine become highly concentrated and crystallize.
The kidneys filter waste products and excess substances from the blood, producing urine that removes these materials from the body. When minerals such as calcium, oxalate, uric acid, or other compounds become too concentrated, crystals can form and gradually develop into stones.
Common types of kidney stones include:
- Calcium oxalate stones
- Uric acid stones
- Struvite stones
- Cystine stones
Several factors can increase kidney stone risk, including:
- Not drinking enough fluids
- High concentration of certain minerals in urine
- Family history
- Certain medical conditions
- Dietary factors
- Some medications
Hydration is an important factor in kidney stone prevention because lower urine volume can allow stone-forming substances to become more concentrated. Creatine supplementation itself, however, has not been established as a cause of kidney stones in healthy adults.
How Does Creatine Work in the Body?
Creatine is a naturally occurring compound produced by the body and obtained through foods such as meat and fish. Most of the body’s creatine is stored in skeletal muscle, where it helps support the rapid regeneration of ATP, the primary energy currency used during muscular activity.
Supplementation increases muscle creatine stores beyond what most people obtain through diet alone, which is one reason creatine has been studied extensively for strength, high-intensity exercise performance, muscle mass, recovery, and healthy aging.
Understanding this metabolism is also important when discussing kidney health because a small amount of creatine and phosphocreatine is continuously converted into creatinine, which is then filtered from the blood by the kidneys.
Can Creatine Cause Kidney Stones?
There is currently no convincing evidence that creatine supplementation causes kidney stones in healthy adults.
An important distinction, however, is that most creatine safety research has evaluated kidney function rather than kidney stone formation specifically. Studies have examined markers such as serum creatinine, glomerular filtration rate (GFR), cystatin C, and urinary markers, while direct research measuring kidney stone incidence in creatine users is comparatively limited.
This means the most scientifically accurate conclusion is not that creatine has been proven to prevent or have zero effect on kidney stones. Rather, creatine has not been established as a cause of kidney stones, and extensive research has generally not demonstrated impaired kidney function in healthy individuals using recommended amounts.
What Does Research Say About Creatine and Kidney Health?
What Studies Show About Kidney Function
Researchers have studied creatine extensively for safety, including its effects on kidney markers.
A review published in the
Journal of the International Society of Sports Nutrition examined creatine supplementation and safety outcomes. The researchers concluded that creatine monohydrate supplementation appears safe for healthy individuals when consumed at recommended doses.
The review highlighted that concerns about kidney damage often come from assumptions rather than evidence from controlled research. Clinical studies involving healthy adults have not demonstrated that creatine supplementation causes deterioration of kidney function.
What Does the Latest Research Show?
A
2025 systematic review and meta-analysis published in BMC Nephrology evaluated research on creatine supplementation and kidney function. The analysis found that creatine supplementation was associated with a modest increase in serum creatinine, but it did not produce a significant adverse change in glomerular filtration rate (GFR).
The researchers concluded that the increase in creatinine was more consistent with creatine metabolism than impaired kidney filtration. This distinction is important because creatinine-based testing alone can sometimes provide an incomplete picture of kidney function in people taking creatine.
Does Creatine Increase Serum Creatinine?
Creatine supplementation can modestly increase serum creatinine in some individuals. Importantly, this does not necessarily mean kidney function has declined.
Creatinine is influenced by several factors, including muscle mass, diet, physical activity, and creatine intake. Because supplemental creatine increases the body’s creatine pool, a small increase in creatinine production can occur without a corresponding reduction in kidney filtration.
This is why clinicians may consider creatinine alongside other measures of kidney function rather than interpreting a single serum creatinine result in isolation. Anyone undergoing kidney-function testing should tell their healthcare provider if they regularly use creatine.
What About Long-Term Creatine Use?
Should you take creatine for long term? One reason creatine is widely accepted is that it has been studied for long-term use. Research involving extended creatine supplementation has not shown harmful effects on kidney function in healthy individuals. This makes creatine different from many supplements that lack long-term safety data. Creatine monohydrate remains the preferred form because it has the strongest scientific evidence.
Why Is Creatine Sometimes Associated With Kidney Concerns?
Much of the concern surrounding creatine and kidney health comes from serum creatinine testing. Because creatinine is commonly used to estimate kidney function, an increase in serum creatinine can appear concerning without the appropriate context.
Creatine supplementation can increase creatinine production without necessarily reducing actual kidney filtration. This distinction has contributed to confusion about whether creatine damages the kidneys.
A second misconception is that creatine causes dehydration. Research does not support that claim in healthy individuals, which is relevant because chronic inadequate fluid intake is an established risk factor for kidney stone formation.
Does Creatine Affect Hydration and Kidney Stone Risk?
One of the most common concerns about creatine is whether it negatively affects hydration. Creatine does increase water storage inside muscle cells. This process, called intracellular water retention, is one reason some people notice a small increase in body weight after starting supplementation.
However, this is not the same as dehydration.
Research has not shown that recommended creatine supplementation causes dehydration or increases the risk of heat-related illness in healthy individuals. Creatine can increase intracellular water, particularly during the early stages of supplementation, but this should not be confused with systemic dehydration.
For individuals using creatine, maintaining adequate fluid intake is still important, just as it is for anyone who exercises regularly.
People often ask:
How much water to drink with creatine?
No universal amount of water is required specifically because of creatine supplementation. Fluid needs depend on factors such as:
- Body size
- Activity level
- Climate
- Sweat loss
- Diet
There is no special water requirement that applies to everyone taking creatine. Hydration needs vary according to body size, activity level, climate, sweat losses, diet, and individual health factors. The goal should be maintaining adequate daily hydration rather than forcing excessive water intake simply because you take creatine. For more detail, read our guide on
How Much Water to Drink With Creatine.
Who Should Discuss Creatine With a Healthcare Professional?
The safety data for creatine are strongest in healthy individuals. People with certain medical histories should discuss supplementation with a qualified healthcare professional before beginning creatine, particularly those with:
- Existing kidney disease
- Reduced kidney function or abnormal kidney laboratory results
- A history of recurrent kidney stones
- Medical conditions that may affect kidney function
- Medications that can affect kidney function or fluid balance
The appropriate decision depends on the individual’s medical history, kidney function, medications, diet, hydration status, and other risk factors.
A history of kidney stones does not automatically determine whether creatine is appropriate. Because kidney stones can have different causes and recurrence risks, people with a history of stones should discuss supplementation with a healthcare professional familiar with their medical history.
Practical Considerations When Taking Creatine
Creatine supplementation is only one part of overall health. Supporting kidney health involves maintaining healthy lifestyle habits.
Here are practical steps:
Stay Properly Hydrated
Adequate hydration supports normal kidney function and helps maintain healthy urine concentration. Your fluid requirements depend on your lifestyle, exercise routine, and environment.
Use Recommended Dosages
More creatine doesn’t automatically mean better results. Most research on conventional creatine monohydrate commonly uses:
- Approximately 3–5 grams daily for maintenance
- Optional loading phases for faster muscle saturation
A loading phase can increase muscle creatine stores more rapidly, but it is not required for creatine to be effective.
Choose Quality Supplements
Supplement quality matters. A reliable creatine product should list ingredients clearly and use a scientifically researched form. Creatine monohydrate remains the most studied option available. For people who prefer convenience, creatine monohydrate capsules provide an easy way to maintain consistent daily intake.
The Bottom Line: Can Creatine Cause Kidney Stones?
Current evidence has not established creatine supplementation as a cause of kidney stones in healthy adults. Research specifically examining kidney stone incidence is more limited than the larger body of evidence evaluating creatine and kidney function.
Key points to remember:
- Creatine has not been established as a cause of kidney stones in healthy adults.
- Creatine supplementation may modestly increase serum creatinine without necessarily indicating kidney damage.
- Research generally supports preserved kidney function in healthy adults using recommended amounts.
- Creatine has not been shown to cause dehydration in healthy individuals.
- People with kidney disease, recurrent kidney stones, abnormal kidney testing, or other relevant medical concerns should discuss supplementation with a healthcare professional.
Whether someone chooses powder, creatine monohydrate capsules, or another convenient format, the goal remains supporting daily creatine intake with a reliable supplement.
Explore more Project Creatine educational resources on creatine monohydrate, dosing, hydration, performance, and healthy aging.
Frequently Asked Questions
Can creatine cause kidney stones?
Current evidence has not established creatine supplementation as a cause of kidney stones in healthy adults. However, research specifically measuring kidney stone incidence is more limited than the broader research evaluating creatine and kidney function.
Does creatine damage kidneys?
Research generally does not show impaired kidney function in healthy adults taking recommended amounts of creatine. Creatine can modestly increase serum creatinine in some people, but this does not necessarily indicate reduced kidney filtration.
How much water to drink with creatine?
There is no specific water requirement created by taking creatine. Fluid needs depend on body size, exercise, climate, and daily activity. Adequate hydration is important for everyone.
Does creatine increase creatinine levels?
Creatine supplementation may slightly increase creatinine levels because creatinine is a natural breakdown product of creatine metabolism. This does not automatically indicate kidney problems.
Should you take creatine if you have a history of kidney stones?
A history of kidney stones does not automatically determine whether creatine is appropriate. Because kidney stones can have different causes and recurrence risks, people with a history of stones should discuss supplementation with a healthcare professional familiar with their individual health history.
Can creatine affect kidney blood test results?
Creatine supplementation may modestly increase serum creatinine in some individuals. Because creatinine is commonly used when evaluating kidney function, supplementation should be considered when interpreting laboratory results. Tell your healthcare provider if you regularly take creatine.
