Simplest protocol
Creatine Monohydrate
Single-ingredient micronized monohydrate for a straightforward daily creatine routine.
View creatine monohydrateObjection: safety
Is Creatine Bad for You? What Your Kidneys and Your Bloodwork Actually Say
The kidney worry comes from a lab value that creatine really does move. The reviews say the kidneys themselves do not. Here is how to read both.
This guide is part of our creatine use-case guides track. For continuity, read creatine monohydrate and creatine for men over 40.
The short answer
For a healthy adult taking creatine in the amounts the research used, the evidence does not show harm to the kidneys or the liver. A 2019 systematic review and meta-analysis found no damage to kidney function markers, and the ISSN position stand reaches the same conclusion. What creatine does do is raise serum creatinine, because creatinine is what creatine becomes when muscle uses it, and a routine kidney panel reads creatinine as a sign of filtration. That can make your labs look worse than your kidneys are. Tell the clinician who orders your bloodwork that you take creatine. If you have kidney disease or take a medication that affects the kidneys, that is a clinician conversation before the first scoop.
Decision brief
What matters before you buy
In healthy adults, the pooled research does not show creatine harming kidney function.
Creatine raises serum creatinine. That is chemistry, not kidney damage, but it can skew a routine panel.
"Creatine" in your bloodwork almost always means creatinine, the waste product the kidneys filter.
Kidney disease, kidney-affecting medication, and age under 18 are reasons to talk to a clinician first.
Muscle Velocity standard
One ingredient, so your doctor knows exactly what you take.
Muscle Velocity Creatine is micronized creatine monohydrate with nothing else in the tub, so the conversation with your clinician is one word long.
Educational content only. Supplements are not a substitute for medical care. Speak with a qualified healthcare professional when a condition, medication, or persistent symptom is involved.
Creatine versus creatinine: the word that confuses the lab
Creatine is the compound your muscle stores to regenerate energy during short, hard efforts. Creatinine is the waste product your body makes as it breaks creatine down, at a fairly steady rate, every day. Your kidneys filter creatinine out of the blood, which is why a blood test measures it: a rising level can mean the kidneys are filtering less.
When someone searches for what creatine means in bloodwork, the lab value they are looking at is almost always creatinine. No routine panel measures creatine itself. Keep the two words apart and the rest of this page gets much simpler.
What a kidney panel measures and why creatine nudges it
A standard panel reports serum creatinine and an estimated glomerular filtration rate, or eGFR, which is a calculation built on that creatinine number. The calculation assumes your creatinine comes from your muscle mass at a normal rate. Add creatine from a supplement and your body makes a little more creatinine, so the calculated eGFR can drift lower without any change in how your kidneys are actually working.
Some studies record a small rise in creatinine with creatine; the 2025 twelve-week trial did not see a change in creatinine or eGFR at the research serving. Either way, a rise comes from creatine's chemistry, not from kidney injury. The practical move is to tell the clinician who reads the panel, and to ask whether a cystatin C test makes sense for you. Cystatin C is a filtration marker that does not come from creatine, and whether you need it is your clinician's call.
What the reviews found in healthy adults
A 2019 systematic review and meta-analysis pooled the trials that tracked kidney function during creatine use and found no harm to the markers in healthy adults. The ISSN position stand, which reviews the broader evidence, reaches the same conclusion and describes creatine as well tolerated in healthy people at the amounts the research used.
Two limits, stated plainly. The reviews cover healthy adults at research-range servings. They do not cover people with existing kidney disease, and neither does this page. If that is you, the answer lives with your clinician, not here.
The other "bad for you" worries
Dehydration and cramping: the 2021 review of common creatine questions found the evidence points the other way, with creatine users reporting no more cramping or heat trouble than non-users. Stomach upset: it happens, mostly with large single servings, and splitting the serving or taking it with a meal is the usual fix. Weight: creatine pulls water into muscle, which can show on the scale in the first weeks; that is water, not fat.
Liver: the position stand reports no evidence of harm in healthy adults. The pattern across all of these is the same. The worries are reasonable questions, and the trials have mostly answered them.
- Cramps and dehydration: not supported by the trial evidence
- Stomach upset: possible with large servings; split or take with food
- Scale weight: water in muscle, usually in the first weeks
Who should not start without a clinician
Kidney disease, a history of kidney problems, or a medication that affects kidney function. Age under 18. Pregnancy or nursing. Unexplained abnormal labs you have not discussed yet. For any of these, creatine is a question for the clinician who knows your history, and the honest answer from a web page is to go ask.
For everyone else, the evidence is reassuring, the creatinine point is the one to remember, and the conversation with your doctor is short.
Buying checklist
What to check before your next blood draw
Tell the clinician
Say that you take creatine and for how long. A creatinine value is read differently when the ordering clinician knows.
Ask about cystatin C
It is a filtration marker that does not come from creatine. Whether it makes sense for you is your clinician's call.
Keep the label serving
A routine panel is a snapshot. Taking more than the label in the week before does not help you or your labs.
Fit check
Who this path is—and is not—for
Good fit
- Healthy men who get yearly bloodwork and want to read it correctly
- Men who have heard that creatine wrecks your kidneys and want the actual studies
Poor fit
- Anyone with kidney disease, a history of kidney problems, or a kidney-affecting medication who has not cleared creatine with their clinician
- Anyone under 18, pregnant, or nursing, or anyone with unexplained abnormal labs
Common questions
The questions worth answering
Is creatine bad for your kidneys?
In healthy adults at research-range servings, the pooled trials do not show harm to kidney function. Creatine does raise creatinine, a lab marker, which can make a routine panel look worse than the kidneys are. People with kidney disease should ask their clinician before using it.
Why is my creatinine high on creatine?
Creatinine is what creatine turns into, so more creatine in the body can mean a little more creatinine in the blood. The kidney panel reads that as a filtration signal. Tell the clinician who ordered the test that you take creatine so the number is read in context.
What is creatine in a blood test?
Almost always creatinine, the waste product your kidneys filter. Routine panels do not measure creatine itself. The creatinine number, with the eGFR calculated from it, is used to check how well the kidneys are filtering.
Does creatine dehydrate you or cause cramps?
The trial evidence says no. The 2021 review of common creatine questions found no higher rate of cramping or heat problems in creatine users, and some data pointing the other way. Drink normally and judge by how you feel.
Should I stop creatine before bloodwork?
Do not stop silently. Tell the clinician who ordered the panel that you take creatine. Some will ask for a pause before the draw, some will simply read the creatinine in context, and some will add a cystatin C test. Follow their call.
Evidence desk
Read the sources, not just the summary
de Souza e Silva et al. 2019, systematic review and meta-analysisPooled trials on creatine and renal function markers in healthy adults.Kreider et al. 2017, ISSN position standTolerability in healthy adults, kidney and liver evidence, water retention.Antonio et al. 2021, common questions and misconceptionsKidney function, dehydration and cramping, and water retention questions.Lak et al. 2025, twelve-week randomized controlled trialNo change in creatinine or eGFR over twelve weeks at the research serving.MedlinePlus, creatinine testWhat creatinine is, what the test measures, and how eGFR is calculated from it.
Related Intelligence
Deepen your understanding with these specific protocols.
Continue the creatine guide