Creatine: Benefits, Safety and the Myths That Won’t Go Away
Creatine is one of the most studied supplements in sports nutrition, and also one of the most misunderstood. Some people still think of it as a steroid that harms the kidneys and causes hair loss. Others now market it as a brain supplement for everyone.
This guide sorts the strong evidence from the hype. You will learn what creatine does in the body and who the research supports it for. You will also see which popular fears hold up, and how to choose a product. New to supplements? Our supplement guide explains how we grade evidence.
What creatine is and what it does
Creatine is a natural compound your body makes and also gets from food. The NIH Office of Dietary Supplements explains where it comes from. The liver and kidneys make about 1 gram a day from three amino acids: glycine, arginine and methionine. A person weighing about 154 pounds carries roughly 120 grams of creatine and phosphocreatine, almost all of it in skeletal and heart muscle.
Its main job is energy. Muscles run on a molecule called ATP, and they burn through it in seconds during hard effort. Phosphocreatine stored in muscle donates a phosphate group to rebuild ATP quickly. That is why creatine matters most for short, intense bursts, such as a sprint, a heavy lift or a jump.
made in liver and kidneys, or eaten
stored in muscle
fast energy for short, hard efforts
waste product, cleared by the kidneys
The NIH fact sheet lists several ways supplementation may help performance. Creatine raises phosphocreatine stores, speeds their refilling after exercise and may help muscles store more glycogen. When creatine is used up, it becomes creatinine, which the kidneys clear. That last step explains one of the biggest myths, covered below.
Food sources of creatine
Creatine comes almost entirely from animal foods. The NIH Office of Dietary Supplements gives these approximate amounts:
| Food (raw weight) | Creatine per pound |
|---|---|
| Pork | About 2.3 g |
| Beef | About 2 g |
| Salmon | About 2 g |
| Plant foods | Essentially none |
Source: NIH ODS, Dietary Supplements for Exercise and Athletic Performance.
The NIH notes that vegetarians have lower creatine levels in their muscles. They may also respond more to supplementation, because there is more room to fill their stores. The amounts studied for performance are much larger than a normal diet provides, which is why athletes use supplements rather than food alone.
Creatine benefits: what the research says
The NIH describes creatine as one of the most thoroughly studied and widely used supplements for exercise and sports. The International Society of Sports Nutrition calls creatine monohydrate the most effective nutritional supplement available for high-intensity exercise capacity and lean body mass. Here is how the evidence breaks down by use.
| Use | Evidence grade | Key finding | Source |
|---|---|---|---|
| Repeated short, high-intensity efforts (sprints, lifting, team sports) | Strong | Often increases strength, power and work in repeated maximal efforts, in both men and women | NIH ODS; ISSN position stand |
| Strength and lean mass with resistance training | Strong | Supports training adaptations over weeks to months | NIH ODS; ISSN |
| Older adults doing resistance training | Moderate | A meta-analysis of 22 trials (721 adults, average age 57–70) found more lean mass and more upper and lower body strength | Chilibeck et al., 2017 |
| Memory | Limited | A 2024 meta-analysis of 16 small trials found a modest memory benefit; most other thinking measures showed no clear effect | Xu et al., 2024 |
| Endurance sports | Insufficient | Little value for endurance events; added body weight may even hinder performance | NIH ODS |
| Bone density in older adults | Insufficient | No clear benefit for total bone mineral density | Mayo Clinic |
Why creatine helps some activities more than others
The phosphocreatine system supplies energy for roughly the first several seconds of maximal effort. Activities built on repeated bursts with short rests, such as interval sprints, soccer or a set of heavy lifts, lean on it heavily. Long, steady efforts such as marathon running rely mainly on other energy systems, so extra creatine adds little.
Creatine also works through training. Being able to complete a few more repetitions or a slightly heavier set, session after session, adds up. That is why the strongest results appear when creatine is combined with resistance training, not when it is taken alone.
Creatine for older adults
Muscle and strength decline with age, and resistance training is the main tool to slow that loss. The Chilibeck meta-analysis found that adding creatine to training gave an average of about 1.4 kg more lean tissue than training alone. Upper and lower body strength also improved more. Mayo Clinic likewise notes that creatine with resistance exercise can improve strength in older adults.
Older adults are also more likely to take medicines and have kidney conditions. That makes a conversation with a doctor before starting especially worthwhile in this group.
Creatine and the brain
Brain cells also use the creatine system for energy, which has made cognition a growing research area. A 2024 systematic review in Frontiers in Nutrition pooled 16 randomized trials with 492 adults. It found a modest improvement in memory, rated moderate certainty. Overall cognitive function and executive function showed no significant effect.
The authors note that samples were small and results varied a lot between studies. Most participants were healthy, and evidence in older adults and people with illness was limited. Brain benefits are an interesting research question, not an established use.
Creatine myths: what the evidence shows
A 2021 review in the Journal of the International Society of Sports Nutrition tackled twelve common creatine misconceptions. Here are the ones readers ask about most, with what the evidence shows.
The concern traces back to a 1998 case report of a man who already had kidney disease. Creatine raises blood creatinine on its own, because creatinine is its normal breakdown product. A higher creatinine number can look like kidney trouble on a lab report even when the kidneys are fine. Mayo Clinic notes that studies in healthy people have not found harm to kidney function at recommended doses. People who already have kidney disease are a different case and should ask their doctor first.
This claim rests on a single 2009 study of male rugby players. It found a rise in DHT, a hormone linked to male-pattern hair loss, over 14 days. It did not measure hair loss. The 2021 review notes that the finding has not been replicated, and other studies found no DHT increase with creatine.
Mayo Clinic reports that research does not show higher rates of cramps or muscle injury with creatine. The NIH notes anecdotal reports of cramps and heat intolerance, and suggests good hydration may reduce these risks.
Creatine is a compound the body builds from amino acids, as the NIH describes. It is not a hormone and works through a different mechanism from anabolic steroids. The 2021 review lists this among the misconceptions it examined.
The NIH notes that short-term studies show benefits in both men and women. Trials in older adults, summarized above, show benefits with resistance training too.
This one has a basis. The NIH says the only consistent side effect is weight gain from water held in the muscles. Some studies saw around 1 to 2 kg in a month. The 2021 review describes early water retention as temporary when it occurs. It is water and muscle, not fat, but it can matter in weight-class or endurance sports.
What the research doesn’t show
- Endurance gains: the NIH says creatine has little value for endurance sports.
- Benefits without training: most strength and lean mass results come from creatine combined with resistance training.
- Better “advanced” forms: the NIH states that forms other than monohydrate have not been shown to be superior.
- A proven brain supplement: evidence for memory is limited, and most thinking measures showed no clear effect.
- Equal results for everyone: the NIH notes that responses vary between individuals.
- Disease treatment: creatine is being studied in several medical conditions, but it is not a treatment for any disease. Anyone with a diagnosed condition should follow their doctor’s plan.
Who might consider creatine, and who usually doesn’t need it
- Adults doing regular resistance training
- Athletes in sprint, power and team sports
- Older adults on a strength program, with their doctor’s agreement
- Vegetarians and vegans who train, given their lower muscle stores
- People who don’t do high-intensity or strength exercise
- Endurance-only athletes
- Anyone hoping for a memory or energy fix without training
- Athletes in weight-class sports close to competition, because of water weight
Reference intakes and upper limit
Creatine is not an essential nutrient, because the body makes it. No RDA, Adequate Intake or Tolerable Upper Intake Level has been set by the National Academies. A doctor or pharmacist can tell you what, if anything, makes sense for you.
Research studies have used a range of intake patterns, with and without a short “loading” phase. The NIH fact sheet describes both approaches. Because the right choice depends on your health, kidneys and goals, we don’t list amounts here. Our page on supplement upper limits explains why “no upper limit” is not the same as “unlimited.”
Creatine side effects and safety
The NIH calls creatine safe for short-term use by healthy adults and notes evidence that several years of use is safe. Mayo Clinic rates it “generally safe” and likely safe for many people for up to five years at recommended doses. The 2017 ISSN position stand reaches a similar conclusion for healthy people.
| Situation | What to know |
|---|---|
| Common side effect | Weight gain from water in muscle. Anecdotal reports include nausea, diarrhea, cramps and heat intolerance. |
| Kidney disease | Research is limited. Talk to your kidney care team before using creatine. |
| Pregnancy and breastfeeding | Creatine in pregnancy is a research topic, but there is not enough safety data to support routine use. Ask your prenatal care provider. |
| Children and teens | Most sports supplement research involves adults. Use only with a pediatrician’s advice. Rare creatine deficiency syndromes in children are treated medically. |
| Older adults | Benefits appear with resistance training. Check kidney function and medicines with your doctor first. |
| Liver disease | The liver helps make creatine. Ask your specialist before adding any supplement. |
| Before surgery or blood tests | List creatine for your care team. It can raise blood creatinine, a common kidney test. |
Report any supplement side effect to FDA MedWatch. Use the Safety Reporting Portal at safetyreporting.hhs.gov or call 1-800-FDA-1088.
Medicines and tests that interact with creatine
| Medicine or test | What can happen | Source |
|---|---|---|
| Caffeine | May reduce creatine’s effect; more research is needed | Mayo Clinic |
| Blood creatinine test | Creatine raises creatinine, which can look like a kidney problem on a lab report | Antonio et al., 2021 |
| Medicines that affect the kidneys | No specific interaction confirmed in our sources, but kidney research is limited. Ask a pharmacist before combining. | Mayo Clinic (kidney caution) |
Always tell your doctor about creatine before blood work, so a raised creatinine number is read correctly. For a wider list, see our guide to supplement-drug interactions.
Creatine forms compared
| Form | What to know |
|---|---|
| Creatine monohydrate | The most widely used and studied form. About 88% creatine by weight, according to the NIH. |
| Creatine ethyl ester | Usually more expensive; not shown to be superior. |
| Creatine alpha-ketoglutarate | Usually more expensive; not shown to be superior. |
| Buffered creatine | Marketed as gentler; not shown to be superior. |
| Gummies | A newer format. Gummy supplements in general have shown more label inaccuracy in testing, so a verified seal matters most here. |
The 88% figure is a useful label-reading point. A label listing “creatine monohydrate” gives the compound weight, which is slightly more than the creatine itself. Our guide on capsules vs tablets vs gummies covers the trade-offs between powders, capsules and gummies.
How to choose a creatine product
- Choose creatine monohydrate, the form with the most research behind it.
- Prefer a single-ingredient product. “Pre-workout” blends may add stimulants and hide amounts in proprietary blends.
- Look for a verified third-party seal. Athletes in tested sports should look for NSF Certified for Sport, which screens for banned substances. Confirm it on the program’s website.
- Read the Supplement Facts panel for the amount per serving and the number of capsules or scoops in one serving.
- Check purity. In ConsumerLab’s 2026 creatine review, one of the tested products failed for too much creatinine, a sign the creatine had broken down.
- Skip bold claims such as “mass gainer,” “anabolic” or “brain fuel.”
Our 7-step guide to choosing a supplement safely covers seals and label checks in more detail.
One example that meets these criteria: creatine monohydrate capsules (affiliate link). Check the label for the amount per serving, the form and a third-party seal, and ask your pharmacist if you take any medicines.
When to talk to a doctor
- You have kidney or liver disease, diabetes or high blood pressure
- You take medicines that affect your kidneys
- You are pregnant, planning pregnancy or breastfeeding
- You are buying creatine for a child or teenager
- A blood test shows raised creatinine while you take creatine
- You notice swelling, a big drop in urine output or ongoing stomach upset
Creatine FAQ
Is creatine safe to take every day?
The NIH says creatine is considered safe for short-term use by healthy adults, with evidence supporting several years of use. People with kidney disease or other conditions should ask their doctor first.
Does creatine make you gain weight?
Often a little, mostly from water held in muscle. The NIH notes gains of about 1 to 2 kg in a month in some studies. It is not fat gain.
Can women take creatine?
Yes. The NIH notes that studies show benefits in both men and women. Pregnancy and breastfeeding are the exceptions where safety data are lacking.
Does creatine cause hair loss?
There is no good evidence that it does. The idea comes from one 2009 study that measured a hormone change, not hair loss, and it has not been replicated.
Which type of creatine is best?
Creatine monohydrate is the most studied form. The NIH states that other forms have not been shown to be superior.
Common mistakes with creatine
- Expecting results without a strength or high-intensity training program
- Paying extra for “advanced” forms with no proven advantage
- Buying stimulant-heavy pre-workout blends instead of plain creatine
- Not telling your doctor before blood tests, so raised creatinine is misread
- Using creatine with kidney disease without medical advice
- Choosing a product without a seal when competing in tested sports
- Confusing early water weight with fat gain and stopping too soon
Pair the question with your training plan
Before buying creatine, write down your training for the next eight weeks. If it includes regular strength or high-intensity work, bring that plan and your medicine list to your doctor or pharmacist. Ask whether creatine fits your health, especially your kidneys. If your plan is mainly endurance or no structured exercise, start with the training instead.
A one-page checklist covering training fit, questions for your doctor and label reading. It also includes myth vs fact and when to stop and call.
This article summarizes published research and official guidance for educational purposes. It is not a recommendation to take any supplement and not an instruction to treat any condition. Supplements can cause side effects and interact with medicines. Please talk to a doctor or pharmacist before starting one, and never delay or stop medical treatment because of anything you read here.
Sources
- NIH Office of Dietary Supplements. Dietary Supplements for Exercise and Athletic Performance: Fact Sheet for Health Professionals (Creatine section). ods.od.nih.gov
- Kreider RB, Kalman DS, Antonio J, et al. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. Journal of the International Society of Sports Nutrition. 2017;14:18. doaj.org
- Antonio J, Candow DG, Forbes SC, et al. Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show? Journal of the International Society of Sports Nutrition. 2021;18:13. doaj.org
- NutraIngredients. Roundup by experts puts to rest common creatine misconceptions (summary of Antonio et al., 2021). nutraingredients.com
- Chilibeck PD, Kaviani M, Candow DG, Zello GA. Effect of creatine supplementation during resistance training on lean tissue mass and muscular strength in older adults: a meta-analysis. Open Access Journal of Sports Medicine. 2017;8:213–226. doaj.org
- Xu C, Bi S, Zhang W, Luo L. The effects of creatine supplementation on cognitive function in adults: a systematic review and meta-analysis. Frontiers in Nutrition. 2024;11:1424972. frontiersin.org
- Mayo Clinic. Creatine. mayoclinic.org
- ConsumerLab.com. Creatine Supplements Review (June 2026, public summary). consumerlab.com
- NSF International. NSF Certified for Sport. nsfsport.com
Last reviewed: October 2026