If you've spent any time around gyms or fitness communities, you've almost certainly come across creatine. It gets talked about endlessly — sometimes overhyped as a performance miracle, sometimes unfairly dismissed as dangerous or unnecessary. The reality sits squarely in between: creatine monohydrate is the most thoroughly researched supplement in exercise science, and the evidence for it is genuinely solid. It's also not magic, and it won't replace good training and nutrition. Here's what you need to know.
What creatine actually is
Creatine is a naturally occurring compound your body makes from amino acids, and you also get it in small amounts from meat and fish. About 95% of your body's creatine is stored in skeletal muscle, where it plays a key role in producing energy for short, intense efforts — think heavy lifts, sprints, and powerful movements lasting up to around ten seconds.
Taking creatine as a supplement raises the total amount of creatine stored in your muscles above what diet alone can provide. That's essentially the whole mechanism: more creatine in the tank, more fuel available for hard efforts.
How it helps — and how much
The primary benefit of creatine is improved performance during short, high-intensity work. When your muscles are better stocked with creatine, you can squeeze out an extra rep or two at a given weight, recover slightly faster between sets, or maintain output across a longer session. Over time, being able to do a little more work — consistently — adds up to meaningfully better strength and muscle gains.
The effect size is real but modest. Creatine won't add 20kg to your squat overnight. What the evidence suggests, across a large body of research, is that it typically produces a useful edge in strength and lean mass over weeks and months of consistent training — on the order of a few percent improvement above what training alone would produce. That's a worthwhile gain, not a transformation.
Creatine also appears to support performance in repeated sprint efforts and high-intensity interval work, making it relevant for more than just gym training. There's also emerging, though not yet definitive, research into cognitive benefits — but that's a different conversation.
Who benefits most
Creatine works best for anyone doing resistance training or high-intensity exercise regularly — which covers most people reading this. If your training involves lifting weights, short bursts of effort, or intervals, you're a reasonable candidate.
People who eat little or no meat tend to start with lower baseline muscle creatine stores, which means supplementation often produces a more noticeable effect for vegetarians and vegans than for those who eat meat regularly. That said, meat-eaters still benefit — they just tend to start from a higher baseline.
Creatine is of limited use for endurance activities like long-distance running or cycling, where the energy system it supports is less central to performance.
How to take it
The standard approach is straightforward: 3–5 grams of creatine monohydrate per day, taken consistently. That's it.
You don't need an elaborate protocol. A small scoop mixed into water, a shake, or juice — taken at whatever point in the day is convenient — is all that's required. Creatine isn't absorbed differently depending on when you take it, so timing genuinely doesn't matter much. If you want a slight edge, some research suggests taking it close to your training session (before or after), but the practical difference is small and not worth stressing about.
The one thing that does matter is consistency. Creatine works by saturating your muscle stores over time, and that effect is cumulative. Missing the odd day is fine. Stopping for weeks negates the benefit.
What about loading?
A loading phase — typically around 20g per day, split into four doses, for five to seven days — accelerates how quickly your muscles become fully saturated. It works, but it isn't necessary. Taking 3–5g daily from the outset gets you to the same place in three to four weeks. Loading is a choice, not a requirement. Some people find higher doses cause stomach discomfort, in which case a standard daily dose is the better option regardless.
Which form of creatine?
Creatine monohydrate. Full stop. It's the form with the strongest and most extensive evidence behind it, and it's also the cheapest. Fancier forms — kre-alkalyn, creatine HCl, buffered creatine — cost significantly more and have no meaningful evidence showing they outperform monohydrate. Save your money.
- Creatine monohydrate is the most-researched supplement in fitness and the evidence for it is strong.
- It helps your muscles store more fuel for short, intense efforts — useful for lifting, sprints and intervals.
- Take 3–5g daily, consistently. Timing doesn't matter much. Loading is optional.
- It's a worthwhile edge, not a miracle. Training and nutrition still do the heavy lifting.
Myth-busting: the things worth addressing
Water retention and looking "puffy"
Creatine does cause your muscles to retain more water — but this happens inside the muscle cells, not under the skin. The kind of water retention that makes you look soft or puffy sits subcutaneously (between the skin and muscle), which is not what creatine does. Most people taking creatine see little or no visible change in their appearance from water alone. Some notice a modest uptick on the scales in the first week or two — often 0.5–1.5kg — which reflects muscles becoming better hydrated, not fat gain.
Hair loss
This one comes up regularly and is worth addressing directly. It stems from a single study that found a rise in DHT (a hormone linked to hair follicle sensitivity) in rugby players taking creatine. That's one study, in one group, measuring a hormonal marker — not hair loss itself. The broader body of research doesn't support the idea that creatine causes or accelerates hair loss, and the finding hasn't been reliably replicated. If you're genetically predisposed to male pattern baldness, DHT plays a role — but there's no solid evidence creatine meaningfully changes that picture.
Kidney safety
Creatine supplementation raises creatinine levels in the blood — creatinine being a metabolic byproduct of creatine. This can look concerning on a blood test if your GP isn't expecting it, because elevated creatinine is also a marker used to assess kidney function. However, a raised creatinine from creatine supplementation does not indicate kidney damage in healthy people. Decades of research in healthy individuals have found no credible evidence of harm to kidney function at standard doses.
If you have a pre-existing kidney condition, diabetes, or any other medical concern, speak to your GP before using creatine — or any supplement. This isn't medical advice, and your health history matters. Anyone with a health condition should check with a doctor first.
The honest bottom line
Creatine monohydrate is the supplement with the strongest evidence base in fitness — and one of the few that's genuinely worth the price of the tub. It's not going to transform your physique on its own, and it doesn't replace consistent training, enough protein, or adequate sleep. But if those fundamentals are in place and you want a legitimate, well-understood edge, creatine is it.
Three to five grams a day. Stay consistent. Drink enough water. That's all there is to it.
If you want help putting together a training and nutrition plan where creatine is just one small piece of a coherent whole, that's what online coaching is for.