Creatine: what does it do and what can you expect?

What is creatine?

Creatine is a substance that occurs naturally in the human body. The body can produce creatine from the amino acids arginine, glycine and methionine. People who eat meat or fish also obtain creatine through their diet.

Most of the body’s creatine is located in skeletal muscle, where it is stored as free creatine and phosphocreatine. The amount present in muscle varies between individuals and is influenced by muscle mass, diet and the starting level of creatine in the muscles (Harris et al., 1992).

Creatine is therefore a naturally occurring substance produced by the body. A creatine supplement is a manufactured product containing this substance in concentrated form, usually as creatine monohydrate.

Creatine is not a hormone, anabolic steroid or stimulant. It does not produce the immediate energised feeling associated with caffeine. Its effect develops as the amount of creatine in muscle increases over several days or weeks.

How does creatine work?

To understand what creatine does, it helps to briefly examine how muscles obtain energy.

Muscle cells use adenosine triphosphate, better known as ATP, as their immediate energy source. When you perform a heavy repetition, sprint or jump, ATP is broken down to release energy quickly.

Muscles can store only a limited amount of immediately available ATP. During short, intense exercise this supply is used rapidly. Phosphocreatine can donate a phosphate group, allowing ADP to be converted back into ATP.

You can think of phosphocreatine as a rapidly available energy reserve for the muscle.

This system is particularly important during heavy strength sets, sprinting, jumping, explosive movement and repeated high-intensity efforts with limited recovery.

Creatine supplementation can increase the total amount of creatine and phosphocreatine in muscle. Muscle-biopsy research shows that supplementation can raise intramuscular creatine and support phosphocreatine resynthesis during recovery after intense contraction (Harris et al., 1992; Greenhaff et al., 1994).

Creatine does not completely prevent fatigue. It may, however, help keep the rapid energy system slightly more available when several hard efforts are performed in succession. This is why creatine generally has a clearer effect on repeated strength sets and sprints than on prolonged low-intensity endurance exercise.

Can you get creatine from food?

Yes. Creatine occurs naturally mainly in meat and fish, and the body also produces it.

You do not need a supplement simply to have creatine in your body. The difference is that it is difficult to raise muscle creatine to the same extent through an ordinary diet.

In the classic study by Harris and colleagues, a 5-gram dose was described as approximately equivalent to the amount of creatine in 1.1 kilograms of fresh, uncooked beef (Harris et al., 1992).

Obtaining an additional 5 grams every day through food would therefore require very large amounts of meat or fish. For most people this is impractical, relatively expensive, unnecessarily high in calories and difficult to sustain.

Meat and fish also provide protein, vitamins, minerals and other nutrients, so they are not merely creatine sources. However, when the specific goal is to increase muscle creatine, a supplement is much simpler.

Vegetarians and vegans

Vegetarians and vegans obtain little or no creatine from their regular diet. Research suggests that they may have lower starting stores and can sometimes experience a larger increase after supplementation (Burke et al., 2003). This does not mean that every vegetarian or vegan will achieve greater training results; the response still depends on the person, training and starting stores.

Why use a creatine supplement?

The purpose of supplementation is to raise muscle creatine and phosphocreatine above the level normally achieved through diet.

• The daily amount is easy to measure.
• You do not need to eat very large amounts of meat or fish.
• Creatine powder provides virtually no calories.
• It is easy to use every day.
• Muscle stores can be increased relatively quickly.

When the goal is specifically to obtain creatine, powder is generally cheaper than eating very large amounts of meat or fish. Creatine monohydrate is the most extensively studied and most widely used form.

What are the proven benefits of creatine?

Better performance during repeated high-intensity exercise

The strongest evidence concerns short, intense efforts that are repeated. Examples include several hard bench-press sets, repeated squats or leg presses, short sprints, repeated jumps and explosive actions with limited recovery.

The European Commission has authorised the health claim that creatine increases physical performance in successive bursts of short-term, high-intensity exercise. The condition for this claim is a daily intake of 3 grams.

Greater strength gains alongside resistance training

Creatine can support strength development during a resistance-training programme. A 2024 meta-analysis examined adults under 50 who combined training with creatine or placebo. The creatine groups achieved greater average gains in upper- and lower-body strength.

These figures are averages across different studies, exercises, training programmes and participants. They do not mean that every user will add exactly 4.43 kilograms to the bench press or 11.35 kilograms to the squat (Wang et al., 2024).

More training volume

Training volume is the total amount of work performed. A simple calculation is: weight × repetitions × sets.

If you complete one or more extra repetitions with the same weight, your training volume increases. Creatine may be particularly useful in reducing the decline in performance across successive hard sets. The advantage may be small in a single session, but repeated over months it can contribute to progress.

Support for muscle growth

Creatine does not create a training stimulus on its own. Muscle growth still requires effective resistance training, suitable nutrition and recovery.

A 2024 meta-analysis found that creatine combined with resistance training produced approximately 1.14 kilograms more lean body mass than training without creatine. Lean mass is not identical to newly built muscle because additional body water is also included (Desai et al., 2024).

Research using more direct measures of muscle size suggests a small additional effect on hypertrophy when creatine is combined with resistance training (Burke et al., 2023). This is likely to occur largely because the user can perform slightly more training work over time.

What can you realistically expect from creatine?

This is the main question for many athletes. Will creatine turn nine repetitions into twelve? Can it immediately increase a 100-kilogram bench press to 105 kilograms?

The effect cannot be predicted precisely for an individual. Responses vary, and creatine does not guarantee a fixed number of additional kilograms or repetitions.

From nine to twelve repetitions?

Moving from nine to twelve repetitions is an improvement of about 33 percent. That is not a realistic standard expectation from creatine alone.

You may also notice no difference in your first set but less of a performance drop in the second, third or fourth set.

Example across several bench-press sets

In this illustrative example the first set is unchanged, but three extra repetitions are completed across the exercise. Three additional repetitions with 100 kilograms equal 300 kilograms of extra training volume.

This is not a guarantee. It illustrates that the benefit may appear in the total work across several sets rather than in one maximal set.

Will your bench press immediately increase by five kilograms?

A heavy weight may move slightly better after loading, but you should not expect creatine to guarantee an increase from 100 to 105 kilograms within one week.

1. The same weight may feel slightly more manageable.
2. You may perform a little more work with submaximal loads.
3. You may lose fewer repetitions in later sets.
4. This can allow more training volume over several weeks.
5. You may reach a new repetition record or heavier load sooner.

Creatine may contribute to progress from 100 to 105 kilograms, but experience, technique, sleep, motivation, body weight, rest periods and normal day-to-day variation also matter.

A realistic expectation at 100 kg × 8

A realistic expectation is therefore often zero to one additional repetition in a hard set, several extra repetitions spread across multiple sets, or less performance decline at the end of an exercise.

What might you notice first?

• Your muscles feel slightly fuller.
• Your body weight increases slightly.
• Your final repetitions move somewhat better.
• You occasionally complete one extra repetition.
• You decline less in later sets.
• Your total training volume increases.

Not everyone feels a clear turning point. Track not only your best set but also total repetitions, total volume, later-set performance and the development of your estimated or actual one-repetition maximum.

When can you notice an effect?

Creatine does not work like an acute pre-workout. A single dose normally does not produce a noticeable strength increase within an hour. Creatine needs time to accumulate in muscle.

Hultman and colleagues found that 20 grams per day for six days increased total muscle creatine by about 20 percent on average. A similar increase was reached after about 28 days with 3 grams per day (Hultman et al., 1996).

Responses vary. Starting muscle creatine, diet, muscle mass, dosage and the type of training can all influence how much difference a person notices.

How do you use creatine?

You can begin with a loading phase to raise stores quickly, or start with a normal daily dose and build them gradually. Both approaches can ultimately produce a similar level of saturation.

Using a creatine loading phase

A loading phase is a short period during which you temporarily take more creatine. The goal is not a higher final storage level but reaching saturation more quickly.

Loading instructions

For five to seven days, take 20 grams of creatine monohydrate per day, divided into four 5-gram servings.

A loading phase can also be calculated as approximately 0.3 grams per kilogram of body weight per day. Four servings of 5 grams are simpler for most recreational athletes.

How long should you leave between doses?

There is no requirement for an exact interval. In the classic study by Harris and colleagues, 5-gram servings were taken roughly two hours apart, but this does not mean that exactly two hours are necessary (Harris et al., 1992).

A practical approach is to spread the four servings through the day, perhaps two to four hours apart. Unequal intervals are not a problem.

Avoid taking all 20 grams at once. A football study reported more gastrointestinal complaints with a single 10-gram dose than when the same daily amount was divided into two 5-gram servings (Ostojic & Ahmetovic, 2008).

The maintenance phase

After five to seven days of loading, the high daily intake is no longer required. Continue with 3 to 5 grams of creatine monohydrate per day.

One 5-gram daily serving is an easy standard for many strength athletes. Research indicates that lower daily doses after loading may also maintain elevated stores (Hultman et al., 1996; Preen et al., 2003).

Should you take creatine every day?

Yes. Take the maintenance dose on training days, rest days, weekends and deload weeks. The supplement works by keeping muscle stores elevated.

During maintenance, the dose no longer needs to be divided. One daily serving is sufficient.

What if you forget one day?

Missing one day does not immediately empty the muscles. Stores decline gradually after stopping, not within a few hours. You normally do not need to double the next dose; simply continue with your normal daily amount.

Using creatine without a loading phase

A loading phase is optional. You can take 3 to 5 grams of creatine monohydrate every day from the beginning.

Muscle stores then rise gradually. After approximately three to four weeks a similar level can be reached as after a short loading phase (Hultman et al., 1996).

Does the timing of creatine matter?

The exact time does not appear to be decisive. Research has not convincingly established that taking creatine immediately before training is clearly better than taking it immediately afterwards. A review concluded that there is insufficient evidence to recommend one optimal timing strategy (Ribeiro et al., 2021).

You can take creatine in the morning, with breakfast, at lunch, in a shake, after training or with dinner. The best time is usually the one you can remember consistently.

Your daily routine matters more than the exact time.

Creatine immediately before training does not act like caffeine or an acute pre-workout. The stores accumulated over previous days are more important than that day’s isolated dose.

Should you take creatine with a meal?

No particular meal is required. Creatine can be taken with water, a protein shake, milk, yoghurt or an ordinary meal.

Older research suggests that a large carbohydrate dose can increase creatine retention, but this does not mean that creatine needs to be taken with a large amount of sugar. Consistent daily intake and an adequate dose are more important for most athletes.

Taking it with a meal may be more comfortable if you otherwise experience stomach discomfort.

How much is in one scoop?

Always read the label. A supplied scoop does not necessarily contain exactly 5 grams. Scoop sizes vary, and a heaped scoop contains more than a level scoop. You can check the amount once with a kitchen scale.

Which type of creatine should you choose?

The simplest and best-studied choice is 100% creatine monohydrate.

Other forms include creatine hydrochloride, buffered creatine, creatine ethyl ester, creatine nitrate, creatine citrate and proprietary blends. A systematic review found no convincing evidence that alternative forms offer better muscle uptake, performance or safety than creatine monohydrate (Fazio et al., 2022).

More expensive creatine is therefore not automatically more effective.

What does micronised mean?

Micronised creatine has been processed into smaller particles. It may mix more easily and feel less gritty, but this does not mean that its physiological effect is fundamentally better.

Possible disadvantages and side effects

Creatine monohydrate has been studied extensively and is generally well tolerated by healthy adults at recommended doses.

A 2025 analysis compiled reported adverse events from 685 clinical creatine trials and found no significant overall difference in adverse-event frequency between creatine and placebo groups (Kreider et al., 2025).

Select a question for more information.

Who should be particularly cautious?

Most safety research has been conducted in healthy people. Discuss use with a doctor first if you have:

• known kidney disease;
• impaired kidney function;
• known liver disease;
• abnormal kidney or liver markers;
• pregnancy or breastfeeding;
• medication that can affect kidney function;
• or another medical situation involving laboratory monitoring.

Creatine is a dietary supplement, not a treatment for disease. Children and adolescents should not use supplements independently; parents or guardians and, where appropriate, a qualified healthcare professional should be involved.

Frequently asked questions

Conclusion

Creatine is a naturally occurring substance that plays an important role in the rapid energy supply of muscle. Supplementation can increase muscle creatine and phosphocreatine.

The clearest proven benefit concerns resistance training, sprinting and other short, intense activities repeated several times. Creatine may help you occasionally complete an extra repetition, lose less performance in later sets, perform more total training volume and potentially gain more strength and muscle during a training programme.

Do not expect a sudden transformation. Creatine will not guarantee that 100 kilograms for eight repetitions becomes twelve repetitions. A more realistic difference is zero to one additional repetition in a hard set or several additional repetitions spread over multiple sets. These small advantages can accumulate over several weeks.

For rapid saturation, take four 5-gram servings per day for five to seven days, followed by 3–5 grams daily. If you are not in a hurry, begin directly with 3–5 grams daily.

The exact timing is probably not decisive. Choose a fixed time that is easy to remember and take creatine on rest days as well. The simplest and best-studied choice is 100% creatine monohydrate.