Can Creatine Raise Creatinine Without Damaging Your Kidneys?

Last updated: 21 September 2026

You start taking creatine to support your strength training. A few weeks later, your blood test shows a higher creatinine level and a lower estimated glomerular filtration rate, or eGFR.

Does this mean the supplement has damaged your kidneys?

Not necessarily.

Creatine supplements can sometimes increase the amount of creatinine measured in your blood. Because creatinine is used to calculate eGFR, this can make kidney function appear worse—even when the kidneys’ true filtering ability has not changed significantly.

However, a high creatinine result should not automatically be blamed on a supplement. The complete clinical picture still matters.

This article provides general health education and does not replace individual medical diagnosis or treatment.

What Is the Difference Between Creatine and Creatinine?

Although their names are similar, creatine and creatinine are not the same thing.

Creatine

Creatine is a naturally occurring compound made from amino acids. Your body produces it mainly in the liver and kidneys, and most of it is stored in skeletal muscle.

Inside the muscles, creatine helps regenerate adenosine triphosphate, or ATP—the immediate source of energy used during short, intense activities such as lifting weights and sprinting.

Creatine is also obtained from foods such as meat and fish. Supplements provide a concentrated amount, usually as creatine monohydrate.

Creatinine

Creatinine is a waste product formed through the normal breakdown of creatine and phosphocreatine in muscle.

It enters the bloodstream and is filtered by the kidneys before leaving the body in urine. Because kidney filtration affects how much creatinine remains in the blood, serum creatinine is commonly used as a marker of kidney function.

The relationship between creatine and creatinine explains why taking more creatine can sometimes influence a creatinine blood test.

How Can Creatine Raise Blood Creatinine?

A small proportion of the creatine stored in your body is converted into creatinine each day.

When you take a creatine supplement, the total amount of creatine available in your body increases. This can result in more creatinine being produced, even if your kidneys are filtering normally.

The change is not identical in everyone. It can be influenced by:

• The amount of creatine taken
• Whether a high-dose loading phase was used
• Muscle mass
• Exercise intensity
• Meat intake before the blood test
• Hydration
• The laboratory method
• Actual kidney function
• Medicines and other supplements

This is why a rise in creatinine after starting creatine needs interpretation rather than an automatic conclusion.

Why Can Creatine Make eGFR Look Lower?

Most laboratories calculate eGFR using serum creatinine together with factors such as age and sex.

When blood creatinine increases, the equation generally produces a lower eGFR.

The calculation assumes that a higher creatinine level is mainly the result of reduced kidney filtration. However, creatinine may also rise because more is being produced.

For example, a muscular person who trains regularly and takes creatine may produce more creatinine than a smaller, less muscular person. A creatinine-based eGFR may therefore underestimate that individual’s actual kidney function.

This does not make eGFR useless. It means the result must be interpreted alongside muscle mass, diet, supplements, previous measurements and other kidney tests.

The National Kidney Foundation explains that creatine supplements, intense exercise, high muscle mass and eating large amounts of cooked meat can all raise creatinine and make calculated eGFR appear lower.

Does Creatine Damage Healthy Kidneys?

Research is generally reassuring for healthy adults using appropriate amounts of creatine monohydrate.

Studies have not consistently demonstrated that standard creatine supplementation reduces kidney filtration in otherwise healthy people. Some apparent deterioration in kidney results may reflect the limitations of using serum creatinine in someone who is taking creatine.

That does not mean creatine is appropriate for everyone or that every supplement labelled “creatine” is automatically safe.

Important questions include:

• Do you have known kidney disease?
• Have you previously had a low eGFR or protein in your urine?
• Do you have diabetes or poorly controlled high blood pressure?
• Are you taking medicines that may affect the kidneys?
• Are you using multiple workout supplements simultaneously?
• Does the product contain other active ingredients?
• Are you taking substantially more than the labelled dose?

People with kidney disease, abnormal kidney-test results or significant risk factors should discuss creatine with an appropriately qualified healthcare professional before using it.

When Should a High Creatinine Result Be Taken Seriously?

Creatine supplementation should never be used to dismiss a potentially important result.

A higher creatinine level may reflect:

• Dehydration
• Recent strenuous exercise
• A large cooked-meat meal
• Increased muscle mass
• Creatine supplementation
• Certain medicines
• Reduced blood flow to the kidneys
• Urinary obstruction
• Acute kidney injury
• Chronic kidney disease

A sudden or substantial change deserves proper assessment, particularly when it occurs with symptoms or other abnormal findings.

Seek medical advice promptly if an abnormal kidney result is accompanied by reduced urine production, swelling, blood in the urine, persistent foamy urine, shortness of breath, vomiting, severe weakness, confusion or significant flank pain.

The absence of symptoms does not completely exclude kidney disease, because early kidney problems may be silent.

Which Tests Can Help Clarify Kidney Function?

One creatinine result should rarely be interpreted alone.

Repeat serum creatinine and eGFR

Repeating the test may show whether the result was temporary, stable or continuing to change.

Tell the healthcare professional who ordered the test that you use creatine. Do not hide supplements because they seem “natural” or unrelated to medication.

Your clinician may advise you about exercise, food, hydration and supplement use before the repeat test. Do not stop prescribed medicines or essential treatment without professional guidance.

Cystatin C

Cystatin C is another blood marker that can be used to estimate kidney filtration.

It is generally less influenced by muscle mass and creatine intake than serum creatinine. An eGFR calculated using both creatinine and cystatin C may provide a more accurate estimate when creatinine production is unusual.

Cystatin C can also be affected by other factors, so it provides additional information rather than replacing clinical judgement.

Urine albumin-to-creatinine ratio

The urine albumin-to-creatinine ratio, or uACR, looks for abnormal amounts of albumin in the urine.

Albumin leakage can be an early sign of kidney damage, particularly in people with diabetes or high blood pressure. It is possible to have a relatively preserved eGFR while urine albumin is already elevated.

A temporary rise may occur after fever, intense exercise or other short-term stress, so an unexpected abnormal result may need confirmation.

Previous laboratory results

Your trend matters.

A creatinine value that has remained stable for years may be interpreted differently from one that has increased rapidly. Previous eGFR, urine albumin, blood pressure and blood-sugar results can help reveal the larger pattern.

Read more practical guidance in the WellNest Central Kidney Health section.

How Should You Prepare for a Creatinine Blood Test?

Follow the instructions provided by your laboratory or healthcare professional.

General preparation may include:

• Tell them that you take creatine.
• Provide the dose and how long you have used it.
• Mention protein powders, pre-workouts and other supplements.
• Report all prescribed and non-prescribed medicines.
• Ask whether strenuous exercise should be avoided beforehand.
• Ask whether you should avoid cooked meat before the test.
• Maintain your normal hydration unless instructed differently.
• Do not deliberately drink excessive water to manipulate the result.

Drinking a very large amount of water immediately before testing is not a reliable or safe way to “improve” kidney numbers.

The aim is to obtain a result that can be interpreted accurately—not to force the value into a preferred range.

What About Loading Doses?

Some creatine programmes begin with a loading phase, often involving a larger daily amount divided into several doses for a few days.

Loading can increase muscle creatine stores more rapidly, but it is not essential for everyone. A smaller consistent daily amount can increase stores more gradually.

Larger doses may be more likely to cause temporary water-weight gain, stomach discomfort, bloating, loose stools or a noticeable change in creatinine.

More is not automatically better. Products should be used according to their instructions and individual health circumstances.

Does Protein Powder Also Raise Creatinine?

Protein powder and creatine are different supplements.

Protein powder does not directly convert into creatinine in the same way creatine does. However, dietary intake, muscle mass, training intensity and the complete supplement routine may affect how kidney results are interpreted.

Some workout products combine protein, creatine, stimulants, herbs and other ingredients. If you only tell your healthcare professional that you use “protein,” an important ingredient may be missed.

Bring the container, photograph the ingredient list or write down the full product name and dose.

Should You Stop Creatine Before a Kidney Test?

Do not make this decision solely from a social-media post.

Depending on the reason for the test and your health history, a healthcare professional may ask you to pause creatine and repeat the measurement. In other circumstances, they may prefer to test while you continue your normal routine or use an additional marker such as cystatin C.

Stopping creatine can help determine whether the supplement contributed to the creatinine rise, but it should not replace an appropriate evaluation of unexpected or worsening kidney results.

How to Use Supplements More Safely

If creatine is appropriate for you:

1. Choose a product with a clear ingredient list.
2. Avoid proprietary blends that hide individual amounts.
3. Follow the recommended serving rather than estimating.
4. Do not combine multiple creatine-containing products unknowingly.
5. Tell your healthcare professional about your use.
6. Review kidney results in context rather than focusing on one value.
7. Seek advice if you have kidney disease or significant risk factors.

The NIH Office of Dietary Supplements provides independent information about supplement ingredients and safety.

The Bottom Line

The connection between creatine and creatinine can make kidney-test results confusing.

Creatine supplementation may increase serum creatinine and make creatinine-based eGFR appear lower without necessarily causing kidney damage. This is particularly relevant for muscular adults and people who train intensely.

But supplementation should not become an automatic explanation for every abnormal result.

A proper assessment may include repeat testing, previous trends, urine albumin, cystatin C, blood pressure, blood sugar, medicines, symptoms and underlying health conditions.

Tell your healthcare professional exactly what you take. Accurate information is essential for accurate interpretation.