Few supplements carry as many warnings as creatine: that it damages the kidneys, causes hair loss, leads to concerning fluid retention, or may increase blood pressure.<\/p>\n
But many of these claims combine findings from specific studies, incorrect interpretations, and recommendations that have been repeated for years without much context.<\/p>\n
In this guide, we review the main creatine contraindications, its possible side effects, and some of the most widespread myths<\/strong>, distinguishing between what is scientifically supported and the situations in which it may be advisable to consult a healthcare professional before using it.<\/p>\n This is probably one of the most common concerns about creatine.<\/p>\n Part of this concern has to do with creatinine<\/strong>, a substance commonly used as a marker when assessing kidney function.<\/p>\n Creatine supplementation may influence creatine and creatinine concentrations, so a change in this marker should not be interpreted in isolation as evidence of kidney damage<\/strong>.<\/p>\n Research carried out in healthy people has extensively studied kidney function during creatine supplementation and has not established that its use under the conditions studied causes kidney damage.<\/p>\n AESAN also states in its assessments that creatinine may be elevated in people who consume creatine without this necessarily implying kidney failure.<\/p>\n This does not mean that the situation is identical for everyone.<\/p>\n In people with pre-existing kidney disease, impaired kidney function, or medical monitoring for this reason<\/strong>, it is especially important to consult a healthcare professional before using creatine supplements.<\/p>\n It may modify some parameters related to creatine metabolism.<\/p>\n Therefore, if you consume creatine and are going to have a blood test, it is advisable to inform the healthcare professional that you are taking this supplement<\/strong>.<\/p>\n This allows the results to be interpreted in the context of the complete picture and prevents conclusions from being drawn based solely on an isolated marker.<\/p>\n This does not necessarily mean that you need to stop using it before every test: any decision of this kind should depend on the instructions of the professional requesting the test.<\/p>\n The relationship between creatine and baldness<\/strong> became particularly popular following a small study conducted years ago in rugby players.<\/p>\n That study observed changes in certain hormonal markers, but it did not directly assess hair loss or demonstrate that creatine caused alopecia<\/strong>.<\/p>\n From there, an association arose that continues to appear on social media and forums.<\/p>\n So far, the available evidence does not allow a causal relationship to be established between creatine supplementation and hair loss<\/strong>.<\/p>\n Therefore, saying directly that \u201ccreatine causes baldness\u201d goes far beyond what the available studies allow us to conclude.<\/p>\n There is a real basis behind this myth.<\/p>\n Creatine supplementation may modify the water content associated with muscle tissue<\/strong>, especially during the early stages of certain protocols.<\/p>\n This may translate into an increase in body weight in some people.<\/p>\n However, this should not automatically be confused with generalized fluid retention or with the usual concept of feeling \u201cbloated.\u201d<\/p>\n In addition, the response may vary between individuals and depend on the protocol used.<\/p>\n For most people, a small variation in body weight may not have much practical significance.<\/p>\n However, it can be important in sports with weight categories<\/strong>, where a few hundred grams or a weight change close to a competition may influence sporting strategy.<\/p>\n In these cases, supplementation should be planned taking the competition schedule into account and, when appropriate, together with a professional specializing in sports nutrition.<\/p>\n The available research does not allow us to establish that creatine alone causes an increase in blood pressure in healthy people<\/strong>.<\/p>\n This does not mean that it can be used as a treatment or that a person with hypertension should modify their supplementation on their own.<\/p>\n If diagnosed hypertension, cardiovascular disease, or drug treatment related to blood pressure is present, it is advisable to assess the individual context with a healthcare professional.<\/p>\n For years, it has been repeated that creatine could increase the risk of muscle cramps or dehydration during exercise.<\/p>\n However, the available evidence has not established that creatine supplementation systematically increases these problems<\/strong> in healthy people who use it in the contexts studied.<\/p>\n In any case, hydration remains important regardless of whether or not creatine is used.<\/p>\n Fluid requirements depend on factors such as exercise intensity, duration, ambient temperature, sweating, and individual characteristics.<\/p>\n There is no universal rule requiring everyone to stop taking creatine before any surgical procedure.<\/p>\n What is advisable is to inform the doctor, anesthesiologist, or healthcare team of all medications, dietary products, and supplements being used<\/strong> before an intervention.<\/p>\n The professional will decide whether any of them should be temporarily discontinued depending on the type of procedure and individual circumstances.<\/p>\n You should not decide on your own what to continue or stop before surgery.<\/p>\n When adverse effects occur during creatine use, one of the most frequently described problems is gastrointestinal discomfort<\/strong>, especially when large amounts or certain protocols are used.<\/p>\n Symptoms such as a feeling of heaviness, digestive discomfort, or diarrhea may occur in some people.<\/p>\n Tolerance is individual and may also depend on factors such as the amount used in a single dose.<\/p>\n If symptoms are persistent or significant, it is advisable to stop using the product and consult a healthcare professional.<\/p>\n Liver function has also been analyzed in studies on creatine supplementation.<\/p>\n In healthy populations, the available evidence has not consistently established liver abnormalities attributable to creatine under the conditions studied<\/strong>.<\/p>\n However, people with pre-existing liver disease or who are under medical supervision should consult a healthcare professional before using dietary supplements.<\/p>\n Although creatine has been extensively studied, there are situations in which it is particularly reasonable to consult a professional before starting.<\/p>\n These include:<\/p>\n Consulting under these circumstances does not necessarily mean that creatine is prohibited. It means that the decision should be individualized<\/strong>.<\/p>\n The answer depends on the medication and the clinical situation.<\/p>\n It is not appropriate to establish a universal list of \u201ccompatible\u201d or \u201cincompatible\u201d medications without knowing the complete treatment.<\/p>\n If a person regularly takes medication, especially if kidney, cardiovascular, or liver disease or another chronic condition is present, the most appropriate course is to consult a doctor or pharmacist before adding a supplement<\/strong>.<\/p>\n We explore this topic in greater depth in our guide on creatine and medication interactions<\/strong>.<\/p>\n Research on creatine in minors is less extensive than the research available in adults.<\/p>\n Therefore, the same recommendation for use given to adults should not automatically be applied to adolescents<\/strong>.<\/p>\n In minors, the use of sports supplements should be assessed individually and supervised by a professional, especially if they are intended to be used for extended periods.<\/p>\n There is no universal recommendation stating that every healthy person who consumes creatine should have blood tests solely for this reason.<\/p>\n This does not mean that blood tests may not be indicated for other reasons.<\/p>\n If there is already medical monitoring, a pre-existing illness, drug treatment, or a relevant medical history, the healthcare professional may establish whatever monitoring they consider necessary<\/strong>.<\/p>\n The safety of creatine has been the subject of numerous studies and assessments.<\/p>\n However, it would be too categorical to claim that every protocol, amount, or duration is automatically safe for every person.<\/p>\n The available evidence provides substantial information about its use in healthy populations, but safety should always be interpreted taking into account the amount, duration, individual characteristics, and conditions of use<\/strong>.<\/p>\n AESAN has specifically assessed the use of creatine monohydrate in dietary supplements at a maximum daily amount providing 3 g of creatine.<\/p>\n Currently, there is insufficient evidence to establish that creatine supplementation is a direct cause of acne<\/strong>.<\/p>\n The fact that a person notices skin changes while using creatine does not in itself demonstrate a causal relationship.<\/p>\n Acne can be influenced by numerous hormonal, genetic, environmental, and lifestyle-related factors.<\/p>\n A universal recommendation should not be established.<\/p>\n A healthy person and a person with diagnosed cardiovascular disease are different contexts.<\/p>\n If heart disease, hypertension, cardiovascular treatment, or specialist monitoring is present, it is advisable to consult a professional before starting any supplementation<\/strong>, including creatine.<\/p>\n The information available for these populations is much more limited than for healthy adults.<\/p>\n For this reason, during pregnancy and breastfeeding, it is not appropriate to start supplementation on your own<\/strong>.<\/p>\n Any decision should be assessed with a healthcare professional who can analyze the individual context.<\/p>\n Some of these beliefs arose when there was much less research than there is today.<\/p>\n This is compounded by confusion between associations and causation.<\/p>\n For example:<\/p>\n creatine \u2192 may modify creatinine \u2192 \u201cit damages the kidney\u201d<\/strong><\/p>\n or:<\/p>\n a study observes a hormonal marker \u2192 \u201cit causes baldness\u201d<\/strong><\/p>\n These are simplifications that remove important steps from scientific reasoning.<\/p>\n Therefore, when reading any claim about creatine side effects<\/strong>, it is worth asking what the cited research actually studied and whether the observed result allows that conclusion to be drawn.<\/p>\n In healthy people, the available evidence does not establish that creatine supplementation causes kidney damage under the conditions studied<\/strong>.<\/p>\n However, people with kidney disease or previous abnormalities should consult a healthcare professional before using it.<\/p>\n Yes, creatine use may influence this marker.<\/p>\n Therefore, it is important to inform your doctor that you use creatine when you have a blood test<\/strong>, so that the results can be interpreted correctly.<\/p>\n An increase in creatinine does not automatically mean that kidney damage is present.<\/p>\n The available evidence does not allow us to establish that creatine causes hair loss<\/strong>.<\/p>\n The association mainly comes from indirect interpretations of studies that did not demonstrate supplementation-caused alopecia.<\/p>\n It may modify the body’s water content, especially that associated with muscle tissue.<\/p>\n This may cause changes in body weight, but it should not automatically be interpreted as problematic fluid retention<\/strong>.<\/p>\n Yes, some people may experience gastrointestinal discomfort.<\/p>\n Tolerance may depend on the amount used and the protocol.<\/p>\n Not necessarily.<\/p>\n Inform the healthcare professional that you use creatine<\/strong> and follow their instructions before modifying or stopping supplementation.<\/p>\n There is no universal rule applicable to all procedures.<\/p>\n Inform the medical team of all supplements and medications you use and follow their instructions.<\/p>\n In healthy populations, the available evidence has not consistently established liver damage attributable to its use in the contexts studied.<\/p>\n If pre-existing liver disease is present, consult a professional.<\/p>\n The evidence is more limited than in adults.<\/p>\n For this reason, its use in minors should be assessed and supervised by a professional<\/strong>.<\/p>\n There is insufficient evidence to establish that everyone should take periodic breaks solely because of a supposed \u201cacclimatization\u201d phenomenon.<\/p>\n The amount, duration, and individual circumstances should be assessed within the context of use.<\/p>\n Currently, there is no sufficiently established causal relationship between creatine and acne.<\/p>\n Yes, some people may experience weight changes related, among other factors, to modifications in muscle water content.<\/p>\n This may be particularly important in sports organized by weight categories.<\/p>\n When discussing creatine contraindications<\/strong>, it is important to separate myths from real precautions.<\/p>\n The available evidence does not support many of the most widespread claims<\/strong>, such as the idea that creatine automatically causes kidney damage, baldness, dehydration, or liver problems in anyone who uses it.<\/p>\n That also does not mean that it is an appropriate supplement for everyone without exception.<\/p>\n People with kidney or liver disease, those who are pregnant or breastfeeding, minors, users of certain medications, or patients with chronic diseases<\/strong> should assess their individual situation with a healthcare professional.<\/p>\n The key is not to consider creatine \u201cdangerous\u201d or \u201ccompletely harmless,\u201d but to interpret the evidence within the appropriate context and use dietary supplements according to their conditions of use.<\/p>\n\n\nMyth: \u201ccreatine damages the kidneys\u201d<\/h2>\n
Can creatine affect a blood test?<\/h2>\n
Myth: \u201ccreatine causes hair loss\u201d<\/h2>\n
Reality with nuances: creatine may increase muscle water content<\/h2>\n
Can this weight gain matter?<\/h2>\n
Myth: \u201ccreatine raises blood pressure\u201d<\/h2>\n
Myth: \u201cit causes cramps and dehydration\u201d<\/h2>\n
Myth: \u201cyou have to stop taking creatine before surgery\u201d<\/h2>\n
What are the side effects of creatine?<\/h2>\n
Does creatine affect the liver?<\/h2>\n
Who should consult before taking creatine?<\/h2>\n
\n
Creatine and medications: can there be interactions?<\/h2>\n
Is creatine safe for adolescents?<\/h2>\n
Are regular blood tests necessary?<\/h2>\n
Is it dangerous to take creatine for a long time?<\/h2>\n
Can creatine cause acne?<\/h2>\n
Can creatine affect people with cardiovascular problems?<\/h2>\n
Creatine, pregnancy, and breastfeeding<\/h2>\n
Why are there still so many myths about creatine?<\/h2>\n
Frequently asked questions about creatine contraindications<\/h2>\n
Is creatine bad for the kidneys?<\/h3>\n
Can it increase creatinine?<\/h3>\n
Does creatine cause baldness?<\/h3>\n
Does creatine cause fluid retention?<\/h3>\n
Can it cause digestive discomfort?<\/h3>\n
Do I have to stop taking it if I am going to have a blood test?<\/h3>\n
Do I have to stop taking it before surgery?<\/h3>\n
Does creatine affect the liver?<\/h3>\n
Is it safe for adolescents?<\/h3>\n
Is it necessary to take breaks from creatine for safety reasons?<\/h3>\n
Does creatine cause acne?<\/h3>\n
Can it affect body weight?<\/h3>\n
To wrap up<\/h2>\n