Creatine: Everything You Need to Know

Everything You Need To Know About Creatine

If there is one supplement that has genuinely earned its reputation, it is creatine monohydrate. In an industry full of flashy claims, underdosed formulas, and supplements that promise the world while doing very little, creatine has stayed popular for one simple reason: it actually works. The International Society of Sports Nutrition has described creatine monohydrate as the most effective nutritional supplement currently available for increasing high-intensity exercise capacity and lean body mass during training, and that view has held up extremely well as the research has continued to grow [1, 2].

That said, creatine is still one of the most misunderstood supplements around. People ask whether it is safe, whether it damages the kidneys, whether it causes bloating, whether women should take it, whether vegetarians need it more, whether the expensive versions are better, whether you need to load it, and whether it causes hair loss. So let’s go through it properly.

What Creatine Actually Is

Creatine is a naturally occurring compound found mainly in skeletal muscle, with smaller amounts in places like the brain and testes. Around 95% of the body’s creatine is stored in skeletal muscle, and about two thirds of that is stored as phosphocreatine. Its main job is to help rapidly regenerate ATP, which is the immediate fuel your body uses for high-intensity efforts such as sprinting, jumping, lifting, and repeated explosive work.

That is why creatine tends to help most with efforts that are short, intense, and repeated. It does not work like caffeine. You do not “feel” it in the same way. It works by gradually increasing muscle creatine stores so that you are better able to maintain output, recover between hard efforts, and accumulate more quality training over time.

Does It Actually Work For Muscle And Strength?

Yes. This is where creatine is at its strongest.

A 2024 systematic review and meta-analysis in Nutrients found that, in adults under 50, creatine supplementation alongside resistance training improved both upper- and lower-body maximal strength compared with placebo [3]. The pooled effect equated to about 4.43 kg more upper-body strength and 11.35 kg more lower-body strength.

On the body composition side, a 2024 meta-analysis in the Journal of Strength and Conditioning Research reported that, compared with resistance training alone, creatine supplementation increased lean body mass by about 1.14 kg, while also reducing body fat percentage by about 0.88% and fat mass by about 0.73 kg [4].

A separate 2024 systematic review and dose-response meta-analysis also found that creatine has a small but meaningful effect on body mass, fat-free mass, and body fat percentage, with results being more robust when creatine is combined with resistance training [5].

So the best way to think about creatine is not as a muscle-building shortcut, but as something that helps you do slightly more quality work over time. A rep here, a bit more training volume there, a little more strength, a better ability to repeat high effort work — and over weeks and months, that adds up. That is why the results are often most obvious when creatine is combined with a proper training programme rather than taken in isolation.

Is The Weight Gain Just Water?

This is where people get confused.

Creatine can increase total body water, especially early on, because it pulls more water into the muscle cell. That is real. But saying creatine “only causes water weight” is too simplistic and, honestly, outdated. Some of the initial increase in body mass can absolutely be due to water shifts, but over time the evidence shows creatine also helps increase lean mass and training adaptations when combined with lifting [6, 7].

In other words, yes, intracellular water is part of the story. But that does not mean the story ends there. The increase in training quality and potential effects on muscle protein-related pathways appear to contribute to genuine lean mass gains over time, particularly when resistance training is in place.

Also, the “bloating” people worry about is often overstated. Creatine does not automatically make everyone look puffy or watery under the skin. Most of the water shift is inside muscle cells, not the sort of subcutaneous water retention people usually mean when they say they look “bloated.” The short version is that some people notice a small bump on the scale, especially during loading, but that is not the same thing as gaining body fat.

What Is The Best Type Of Creatine?

For nearly everyone, the answer is simple: creatine monohydrate.

It is the most studied form by a mile, it is effective, it is inexpensive, and the research still supports it as the reference form. The 2017 ISSN position stand supported creatine monohydrate as the gold standard, and more recent reviews continue to point to monohydrate as the preferred form over newer, more expensive variants [8, 9].

A 2024 trial comparing creatine monohydrate and creatine hydrochloride (HCl) found that both forms improved outcomes alongside resistance training, but HCl showed no benefit over monohydrate [10].

That is an important point because supplement companies love selling “advanced” forms of creatine as if monohydrate is somehow old news. In reality, the burden of proof is on those newer forms to outperform monohydrate, and at the moment that evidence is not convincing. If a product costs more because it uses a fancy form of creatine, that does not automatically mean it works better.

Do You Need A Loading Phase?

Not necessarily, but it can help if you want results sooner.

A common loading strategy is about 0.3 g per kg of bodyweight per day for at least 3 days, often rounded to roughly 20 g per day split into 4 doses for 5–7 days, followed by 3–5 g per day for maintenance. The ISSN notes that this is the quickest way to increase muscle creatine stores [11].

If you skip loading and just take 3–5 g per day, you will still raise muscle creatine stores — it just takes longer, usually a few weeks rather than a few days [12].

So loading is optional. It is not more “effective” in the long run. It just gets you to saturation faster. For most people, especially if they are not in a rush, taking 5 g daily is the easiest and most sensible option [13]. If you are prone to stomach upset, this approach is often better too.

Is There A Best Time To Take It?

Probably not in any way that matters for most people.

There has been some interest in whether taking creatine pre- or post-workout is superior, but the evidence is limited and inconsistent. The broader takeaway from the studies is that consistency matters more than timing [14, 15]. Saturating muscle creatine stores is the main goal. If you want to take it after training because it helps you remember, great. If you take it with breakfast every day, also fine.

This is one of those situations where people try to optimise the 1% while missing the 99%. The biggest mistake is not taking creatine at the “wrong” time. It is taking it randomly, forgetting for days at a time, and then wondering why nothing seems to happen.

Is Creatine Safe?

In healthy people, the evidence is very reassuring.

A 2025 analysis of 685 human clinical trials found that creatine supplementation was generally well tolerated and did not increase the prevalence or frequency of reported side effects compared with placebo [16]. Across more than 12,800 creatine users and 13,400 placebo users, there were no significant differences in total side-effect frequency, and no significant differences in markers of renal function and health.

That same paper is useful because it shows how much the public discussion gets distorted. Social media makes creatine sound controversial, but when researchers looked across the literature and adverse-event databases, the signal for major harm just was not there.

A 2025 review of common safety concerns also concluded that claims about dehydration, cramps, kidney harm, cancer, and broad safety issues are often overstated or unsupported by controlled data, while noting that caution is still sensible in populations where evidence is limited, such as some people with pre-existing kidney disease or during pregnancy [17].

So for healthy adults, creatine monohydrate is one of the best-supported supplements we have from a safety and efficacy point of view [18].

What About Kidneys?

This is probably the biggest myth around creatine.

Creatine supplementation can sometimes raise serum creatinine, but that does not automatically mean kidney damage. Creatinine is a breakdown product related to creatine metabolism, so if you increase creatine intake, blood creatinine may rise a little in some people even when kidney function is perfectly normal. That is one reason context matters when interpreting blood test [19, 20].

A 2024 Mendelian randomization study found that creatine levels were not statistically associated with renal function [21]. A 2025 review on kidney function concluded that creatine appears likely to be safe for kidney function in healthy individuals when used within recommended doses [22].

The larger 2025 safety analysis I mentioned above also found no significant differences in side effects related to renal function and health between creatine and placebo groups [23].

That said, there is an important bit of nuance here. Most of the reassuring data are in healthy people. If someone already has known kidney disease, is under renal investigation, or has been specifically advised by a doctor to avoid certain supplements, that is a different conversation. The evidence is much stronger for safety in healthy adults than in people with pre-existing renal problems [24, 25].

Does It Cause Dehydration Or Cramping?

Again, the myth is stronger than the evidence.

A 2025 review stated that claims linking creatine to dehydration and muscle cramping are largely unsupported by controlled studies, and that creatine may even help with thermoregulatory balance [26].

In a controlled study of trained men exercising in the heat while dehydrated, short-term creatine monohydrate supplementation did not compromise hydration status, thermoregulation, or increase symptoms of heat illness [27].

Older sport-specific data in collegiate football players also found that creatine use did not significantly promote dehydration, cramping, or muscle injury compared with non-users [28].

That does not mean nobody ever feels off when taking it. Some people get mild stomach discomfort, especially with large doses, poor mixing, or aggressive loading phases. But the idea that creatine is inherently dehydrating has not held up well.

Does Creatine Cause Hair Loss?

This one that I googled more than once...

The concern came largely from an older study that raised questions about DHT, which then turned into years of social media posts claiming creatine causes baldness. The problem is that this was never the same thing as proving creatine causes actual hair loss. More importantly, there was no direct trial looking at hair follicle outcomes until recently.

A 2025 randomized controlled trial specifically looked at this issue and reported that there is currently no direct evidence linking creatine supplementation to hair follicle health problems [29].

So at the moment, the honest answer is this: the popular claim that creatine causes hair loss is not supported. That is very different from saying we know everything with absolute certainty, but the evidence people usually use to scare others about creatine and hair loss is weak.

Does Creatine Help The Brain Too?

Possibly, yes — although the evidence is more mixed than it is for strength and muscle.

A 2024 systematic review and meta-analysis found that creatine supplementation had significant positive effects on memory, attention time, and processing speed time, though it did not significantly improve overall cognitive function or executive function, and some of that evidence was rated as low certainty [30].

So the brain side of creatine is promising, but it is not as much as the muscle-performance side. It is fair to say there is growing evidence that creatine may help in certain cognitive domains and certain populations, but it would be overstating things to present it as a guaranteed nootropic for everyone [31].

What About Women?

Women can take creatine too, and the current evidence suggests it appears safe. The main issue is not that creatine is ineffective in women, but that women have historically been underrepresented in sports nutrition research, which makes female-specific conclusions harder to draw with the same confidence as in men.

A 2025 systematic review on active females concluded that creatine use in women appears to be safe, but also made clear that the female literature base is still smaller than it should be [32]. Another 2025 review on women’s health suggested creatine may support several aspects of women’s health across the lifespan, while also calling for more research on dosing, life-stage considerations, and long-term outcomes [33].

So if a woman lifts weights, wants to improve performance, or simply wants to use one of the most evidence-based sports supplements available, there is no good reason to write creatine off as “just for blokes in the gym".

Is Creatine Better For Vegetarians And Vegans?

Potentially, yes.

Creatine is found mainly in animal products, so vegetarians often start with lower creatine stores than omnivores. A systematic review found that creatine supplementation increased lean tissue mass, strength, muscular endurance, and some cognitive outcomes in vegetarian participants, although the evidence was mixed on whether vegetarians improve performance to a greater extent than omnivores [34].

That means vegetarians and vegans may be particularly good candidates for creatine supplementation, not because omnivores do not benefit, but because people eating little or no animal-derived creatine may have more room to increase stores. The review also noted that most creatine supplements themselves are synthesised and typically vegan-friendly, though capsule materials can vary.

Why Do Some People Swear By It While Others Say It Did Nothing?

Because response varies.

Not everybody responds to creatine in the same way. Some people have lower baseline muscle creatine levels and therefore see a more obvious effect once they supplement. Others already have relatively high stores and notice less. Older literature has described responders, quasi-responders, and non-responders, with around 20–30% of people sometimes classed as low responders or non-responders depending on the definition used [35, 36].

That does not mean creatine is useless in those people. It just means the visible effect may be smaller. If someone already eats a lot of meat, already trains well, and already has relatively high stores, the jump may be less dramatic than it is in someone starting from a lower baseline.

Who Is Creatine Actually Worth Taking For?

Creatine is most obviously worth considering if you:

• lift weights

• sprint or do repeated high-intensity sport

• want a simple supplement with one of the best evidence bases in all of sports nutrition

• struggle to eat much dietary creatine because you are vegetarian or vegan

• want a supplement that may support training quality, strength, lean mass, and possibly some aspects of cognition

It is probably less exciting if you:

• do not train hard

• expect it to work like a stimulant

• want dramatic physique changes without sorting out training and diet

• are looking for a miracle rather than a performance and consistency tool

So, Should You Take It?

For most healthy people who train, yes, creatine monohydrate is absolutely worth considering.

It is one of the cheapest, safest, and most evidence-backed supplements you can buy. It helps with strength, high-intensity performance, and lean mass gains when paired with resistance training. It does not need to be fancy. It does not need to be cycled. It does not need perfect timing. And for most people, it does not need a loading phase either.

If you want the simple version: Take 5 g of creatine monohydrate per day, every day, and be patient. If you want to saturate stores faster, load it. If you do not, just take the standard dose consistently and let it build over time.

For once, the boring supplement really is the good one.