Creatine is one of the most researched and effective supplements available. It works by increasing the availability of a molecule called adenosine triphosphate (ATP) in your muscles, giving them more fuel for short, intense bursts of effort. Whether you want to lift heavier, recover faster, or simply feel stronger day to day, understanding what creatine actually does helps you use it with confidence. Below, we break down the most common questions people have about creatine, from how it works to whether it is safe to take long term.
How does creatine actually work in your muscles?
Creatine works by replenishing your muscles’ primary energy currency, ATP, more quickly during high-intensity exercise. Your body stores creatine as phosphocreatine in muscle tissue. When you perform a powerful movement, phosphocreatine donates a phosphate group to spent ADP molecules, rapidly regenerating ATP and allowing your muscles to keep firing harder for longer.
Your body produces some creatine naturally in the liver and kidneys, and you also get small amounts from eating meat and fish. However, the total stored in your muscles is typically below the maximum your body can hold. Supplementing with creatine saturates these stores, meaning your muscles have a larger reserve to draw from the moment intensity spikes.
This is why creatine’s effects are most noticeable during efforts lasting roughly one to ten seconds, such as a heavy squat, a sprint, or an explosive jump. It does not directly fuel steady-state cardio, but by helping you train harder in those peak moments, it indirectly improves overall performance over time.
What are the proven benefits of taking creatine?
The proven benefits of creatine include increased strength and power output, greater muscle mass over time, improved recovery between sets, and emerging evidence suggesting cognitive benefits. These effects are backed by decades of research, making creatine one of the most consistently supported supplements in sports science.
Here is a summary of the key benefits that research has consistently demonstrated:
- Increased strength and power: More phosphocreatine in the muscles means more fuel for heavy lifts and explosive movements, which translates to better performance in the gym over time.
- Greater muscle growth: By allowing you to train at higher intensities and volumes, creatine creates a more powerful stimulus for muscle protein synthesis.
- Faster recovery between sets: Replenishing ATP more quickly means shorter rest periods feel less taxing, and you can maintain quality across more sets.
- Improved high-intensity endurance: Repeated sprint performance and interval-based training both benefit from higher phosphocreatine stores.
- Potential cognitive support: The brain also uses ATP, and some research suggests creatine supplementation may support mental clarity, especially during sleep deprivation or periods of high stress.
It is worth noting that creatine is not a stimulant and does not create an immediate energy rush. Its benefits build gradually as your muscle stores fill up, typically over one to two weeks of consistent use.
Does creatine cause water retention or weight gain?
Yes, creatine does cause an initial increase in body weight, typically between one and three kilograms, due to water retention inside the muscle cells. This is not fat gain, and it is not the same as bloating. The water is drawn into the muscles themselves, which can actually make them look slightly fuller and more defined.
This intracellular water retention is a normal and expected response to creatine loading. It happens because creatine is stored in the muscles alongside water, and as your stores fill up, water follows. Many people notice this within the first week of supplementation.
Over the following weeks and months, any additional weight gain from creatine use reflects genuine muscle tissue growth, assuming you are training consistently and eating enough protein. The water weight that arrived early on becomes less noticeable as actual muscle mass increases.
If you are someone who monitors body weight closely for a sport with weight categories, this initial shift is worth factoring in. For most people pursuing strength, body composition, or general fitness goals, the water retention is a minor and temporary consideration rather than a drawback.
Who should — and shouldn’t — take creatine?
Creatine is well suited to anyone who does resistance training, high-intensity interval work, or any sport involving repeated powerful efforts. It is also increasingly recommended for older adults looking to preserve muscle mass and for people under high cognitive or physical stress. Most healthy adults can take creatine safely.
Who benefits most from creatine
Creatine is particularly valuable for people who train with weights, perform sprint-based exercise, or want to support long-term muscle maintenance. Older adults are a group that often gets overlooked in this conversation. From our mid-thirties onward, maintaining muscle mass becomes progressively harder, and creatine can meaningfully support that process when combined with weight loss and muscle mass training.
Vegetarians and vegans also tend to respond especially well to creatine supplementation because they get little to none from food sources, meaning their baseline muscle stores are often lower and the relative benefit of supplementing is greater.
Who should approach creatine with caution
People with pre-existing kidney conditions should speak to a doctor before starting creatine, as the kidneys are involved in processing it. Healthy kidneys handle creatine without difficulty, but if kidney function is already compromised, it is sensible to get medical advice first. Pregnant or breastfeeding individuals should also consult a healthcare professional before supplementing, as research in this area remains limited.
How much creatine should you take and when?
The most widely supported approach is to take three to five grams of creatine monohydrate per day, consistently, without a loading phase. This dose saturates muscle stores within three to four weeks. Timing is less critical than consistency, but taking creatine close to your workout, either before or after, is a practical habit that many people find effective.
Some protocols recommend a loading phase of around twenty grams per day split into four doses for the first five to seven days, followed by a maintenance dose of three to five grams. This does saturate stores faster, but it also increases the likelihood of digestive discomfort and is not necessary for long-term results.
Here is a simple approach to get started:
- Choose creatine monohydrate: It is the most researched form and typically the most affordable. Other forms exist but offer no proven advantage.
- Take three to five grams daily: Mix it into water, a protein shake, or any drink. It dissolves easily and is largely tasteless.
- Stay consistent: The benefits come from sustained elevated muscle stores, not from any single dose. Missing a day occasionally is not a problem.
- Stay hydrated: Because creatine draws water into your muscles, drinking enough fluids throughout the day supports the process and helps you feel your best.
There is no strong evidence that you need to cycle on and off creatine. Continuous daily use at a maintenance dose is the simplest and most effective approach for most people.
Is creatine safe for long-term use?
Yes, creatine is safe for long-term use in healthy individuals. It is one of the most extensively studied supplements in existence, with research spanning more than three decades and involving a wide range of populations. No credible evidence links long-term creatine use to kidney damage, liver harm, or other serious health risks in people who are otherwise healthy.
The persistent myth that creatine damages kidneys stems from a misunderstanding of creatinine, a natural waste product that the kidneys filter. Creatine supplementation does raise creatinine levels slightly, which can look unusual on a standard blood test, but this does not reflect actual kidney stress or damage in healthy people.
Long-term studies following people who have used creatine consistently for several years show no adverse effects on organ function, hormonal health, or general well-being. It is used safely by professional athletes, recreational gym-goers, and older adults alike.
As with any supplement, quality matters. Choose a product that has been third-party tested and sticks to the basics. Plain creatine monohydrate, without added stimulants or proprietary blends, is the safest and most effective option available.
How we support your nutrition and supplementation approach
Knowing what to take is one thing. Knowing how it fits into your overall approach to training, recovery, and nutrition is where real progress happens. At B-One Training, we help our clients build a complete picture of their health, not just their workouts.
Our coaches cover:
- Practical, personalised nutrition guidance that complements your training goals
- Supplement advice grounded in evidence, without unnecessary complexity
- Holistic support across sleep, stress, recovery, and daily habits
- One-on-one coaching in private studios across Jordaan, Oud-Zuid, and Centrum
If you are ready to stop guessing and start training with a clear, personalised plan, we would love to hear from you. Get in touch with us and let’s talk about what the right approach looks like for you.