Will creatine make me bloated? Is it bad for my kidneys? Will it make my hair fall out? For a supplement with so much research behind it, creatine still comes with a surprising amount of confusion. I hear it all the time around our office building.
As an exercise physiologist, nutritionist and runner, I want to understand what a supplement actually does, who might benefit and whether the concerns are supported by evidence. A 2021 review by Antonio and colleagues tackles 12 common questions about creatine. Here is a practical look at each, following the same topics as the paper.
Does creatine lead to water retention?
It can, particularly when you first start taking it or use a loading protocol. Creatine draws water into muscle cells, which can increase body weight. Some studies have also found changes in water outside the cells, so saying the extra water is always exclusively inside muscle would be inaccurate.
Longer-term results are mixed. Some studies found increased body water, while others found no significant changes or no disproportionate increase relative to muscle mass.
The useful distinction is between water weight and body fat. If the scales go up after starting creatine, that does not automatically mean you have gained fat. Similarly, an early increase in lean mass isn't necessarily all new muscle tissue.
Is creatine an anabolic steroid?
No. Your body makes creatine naturally, and you also get it from foods such as meat and fish. It helps replenish ATP, the immediate energy source your muscles use during demanding exercise.
Anabolic steroids act through hormone-related pathways. Creatine works through your energy system, helping support short, intense efforts such as lifting weights or repeated sprints. That can allow you to do more work in training and, over time, improve your results.
Helping you build muscle does not make a substance a steroid.
Does creatine cause kidney damage or renal dysfunction?
The controlled research examined in this review did not show kidney damage from recommended creatine doses in healthy people.
Some confusion comes from creatinine, a breakdown product measured in blood tests to help estimate kidney function. Taking creatine can raise creatinine without necessarily indicating kidney damage. That can complicate interpretation, especially if the clinician does not know you are supplementing.
Tell your clinician if you take creatine, and have abnormal results assessed rather than assuming they are harmless. If you have existing kidney disease, discuss supplementation with your treating clinician.
Does creatine cause hair loss or baldness?
The concern largely came from one small study in male rugby players that found an increase in dihydrotestosterone, or DHT, after creatine supplementation. DHT is involved in some forms of hair loss, which is how the theory gained attention.
However, the study did not measure hair loss. The review also noted that the DHT finding had not been replicated at the time of publication and that hormone concentrations remained within normal clinical ranges.
The evidence reviewed did not establish that creatine causes baldness. A change in a hormone linked to hair loss is not the same as demonstrating that people actually lose hair.
Does creatine lead to dehydration and muscle cramping?
The review found that experimental and clinical research did not support this claim.
The theory was that drawing water into muscle might leave less available elsewhere, potentially affecting hydration and temperature regulation. But a plausible explanation still needs to hold up under testing, and the research did not show the predicted increase in dehydration or cramps.
As a runner, I would still pay attention to fluids, conditions and the demands of the session. Creatine does not replace a hydration plan, but the evidence in this review does not justify avoiding it because you are worried it will cause cramps.
Is creatine harmful for children and adolescents?
This needs more care than a simple yes or no. The review described studies in young athletes and children with specific medical conditions that did not identify clear adverse effects. However, the evidence was much smaller than in adults.
Crucially, many youth performance studies were not designed to thoroughly assess safety. Finding no reported problems is reassuring, but it does not establish long-term safety for every young person.
For a child or teenager, I would involve an appropriately qualified health professional and first address food intake, recovery and training. Adult supplementation advice should not simply be copied across.
Does creatine increase fat mass?
The trials discussed in the review did not support the claim that creatine increases body fat.
This misconception probably persists because body weight can rise, particularly early on. Water contributes to that change, and muscle gains may contribute over a longer training period.
For anyone trying to improve body composition, remember that the scales can't tell you which tissue or fluid has changed. Creatine is not a fat-loss supplement, but a weight gain after starting it is not evidence that it has made you fatter.
Is a creatine loading phase required?
No. Loading increases muscle creatine stores more quickly, but you can build those stores with smaller daily doses.
The review describes 3–5 grams daily as effective. In one comparison, taking 3 grams daily for 28 days produced a similar increase in muscle creatine to taking 20 grams daily for six days.
For someone without a reason to rush, I like the simplicity of a consistent daily dose. Loading can produce a more noticeable early weight increase, and large individual servings can cause gastrointestinal discomfort. Faster saturation is an option, not a requirement.
Is creatine beneficial for older adults?
Yes, particularly alongside resistance training. The review describes evidence that this combination can improve muscle mass, strength and aspects of physical function in older adults.
Taking creatine without training has produced less consistent results. One study discussed in the paper found that two years of supplementation without a resistance training programme did not increase lean mass in postmenopausal women.
This is where the conversation becomes relevant beyond sport. Maintaining strength helps us keep doing the things we enjoy as we age. Creatine may support that goal, but progressive strength training remains central.
Is creatine only useful for resistance or power activities?
Its best-established performance applications involve short, intense efforts, but the review also discusses potential benefits for recovery, glycogen replenishment and tolerating demanding training.
For runners, that is interesting. It does not mean creatine is proven to make everyone faster over a long, steady run. Supporting strength sessions or aspects of recovery is different from directly improving endurance race performance.
I would consider it in the context of the whole training programme and the individual response, including whether a change in body mass matters for the event.
Is creatine only effective for males?
No. The review describes studies showing improvements in strength, lean mass and certain performance measures in women, although not every study found a benefit.
It also discusses research in postmenopausal women, where creatine combined with resistance training may help improve muscle and physical performance. Other proposed applications across a woman's lifespan were less established. For example, the pregnancy discussion relied heavily on animal research and should not be read as a recommendation for routine use during pregnancy.
Women have good reason to be included in the creatine conversation. The useful question is whether it supports your goals, rather than whether the marketing looks like it was designed for you.
Are other forms of creatine similar or superior to monohydrate, and is creatine stable in solutions or beverages?
Creatine monohydrate is the most extensively studied form. The review found no convincing evidence that alternative forms increase muscle creatine stores more effectively than an equivalent amount of monohydrate.
Dry powder is very stable. Once mixed into liquid, stability depends on factors including temperature, acidity and storage time. Mixing a serving and drinking it soon afterwards is different from leaving it in a prepared drink for days.
My practical choice would be straightforward creatine monohydrate that has been tested for purity, such as Chief Creatine.
Does creatine improve cognitive function?
Although this study doesn't mention it, creatine can improve cognitive function in sleep-deprived individuals. Several scientific studies have shown positive results with a 20 g per day dose. That’s about four scoops of Chief Creatine Focus+ taken when you have sleepless nights. If you sleep well and feel normal, creatine is not likely to enhance your cognitive function beyond your optimum.
Creatine deserves consideration because the research is pretty solid, with the strongest benefits tied to specific goals and training. Understanding what it can do, and where the evidence is still limited, makes the decision much easier than relying on its reputation.
References
- Antonio, J., Candow, D. G., Forbes, S. C., Gualano, B., Jagim, A. R., Kreider, R. B., Rawson, E. S., Smith-Ryan, A. E., VanDusseldorp, T. A., Willoughby, D. S., & Ziegenfuss, T. N. (2021). Common questions and misconceptions about creatine supplementation: What does the scientific evidence really show? Journal of the International Society of Sports Nutrition, 18, Article 13. https://doi.org/10.1186/s12970-021-00412-w
- McMorris, T., Harris, R. C., Swain, J., Corbett, J., Collard, K., Dyson, R. J., Dye, L., Hodgson, C., & Draper, N. (2006). Effect of creatine supplementation and sleep deprivation, with mild exercise, on cognitive and psychomotor performance, mood state, and plasma concentrations of catecholamines and cortisol. Psychopharmacology, 185, 93–103. https://doi.org/10.1007/s00213-005-0269-z
- Gordji-Nejad, A., et al. (2024). Single dose creatine improves cognitive performance and induces changes in cerebral high energy phosphates during sleep deprivation. Scientific Reports, 14, Article 4937. https://doi.org/10.1038/s41598-024-54249-9
