Creatine: what it is, how it works, and what it is useful for?

Creatine is one of the most researched and effective sports supplements in the world, helping muscles produce energy during intense exertion. Although the body produces this substance itself, additional intake allows for complete saturation of muscle stores and improves both physical and mental performance.

There are many myths about creatine: some confuse it with steroids, others fear for their kidneys, and some do not know when and what dose to take. In reality, it is a natural amino acid compound whose safety has been confirmed by more than 30 years of clinical research.

Below we discuss how creatine works at the cellular level, the specific benefits it provides for strength, muscle mass, and brain function, how to dose it correctly, and which forms are worth choosing: monohydrate, "Creapure," "Kre-Alkalyn," or creatine malate.

What is creatine? Definition, composition, and natural sources

Chemically, creatine is an organic compound made up of three amino acids: arginine, glycine, and methionine. The body synthesizes it itself in the liver, kidneys, and pancreas, producing about 1–2 g per day.

About 95% of all creatine is stored in skeletal muscles in the form of phosphocreatine, which serves as a quick energy source. The remaining 5% is distributed in the brain, heart, and other metabolically active tissues.

Besides internal synthesis, creatine is obtained from animal-based foods. It is most abundant in red meat (beef – about 0.9 g/100 g) and fatty fish such as herring or salmon (0.7–1 g/100 g). To reach a typical supplement dose of 3–5 g from diet alone, one would have to eat 1–2 kg of meat per day, which is practically difficult to achieve.

For this reason, vegetarians and vegans experience a more pronounced supplement effect, as their muscle creatine stores are usually 20–30% lower than those of meat-eaters.

Synthetic creatine monohydrate is chemically identical to that produced by the body itself, so muscle cells absorb and use it just like the natural one.

How creatine works in the body: ATP, phosphocreatine, and energy production

Muscle cells use ATP (adenosine triphosphate) as "fuel," a molecule that releases energy for any contraction. However, ATP stores in the cell are very small and last only a few seconds of intense work.

Here phosphocreatine comes into play – like a backup energy tank. It donates its phosphate group to the depleted ADP molecule, thus restoring ATP almost instantly, without oxygen.

During the first 10–15 seconds of explosive effort (heavy squats, sprints, overhead lifts), muscles rely precisely on this phosphocreatine system. The larger its stores, the longer maximum power is maintained.

The practical benefit is seen in the gym. A higher phosphocreatine content in muscles means more repetitions with the same weight, faster recovery between sets, and a greater overall training load. In the long term, a higher load leads to greater muscle mass and strength gains.

The effect extends beyond muscles. The brain uses the same ATP–phosphocreatine system, so saturated creatine levels improve working memory and attention, especially in cases of sleep deprivation or mental fatigue.

There is also a secondary effect: creatine draws water into muscle cells, increasing their volume. This cellular hydration creates an anabolic environment favorable for protein synthesis and muscle fiber growth.

Benefits of creatine: for muscles, strength, brain, and older adults

Creatine is one of the most researched sports supplements, but its effect is realistic, not miraculous. A typical result after a few weeks of use: about 5–10% strength increase in heavy exercises and a 1–2 kg weight gain due to water in muscle cells.

For athletes, creatine provides several specific benefits:

• Greater strength and power when performing explosive movements (squats, push-ups, sprints).
• More repetitions in heavy sets when phosphocreatine stores are higher.
• Faster recovery between sets and workouts.
• Muscle mass growth because a higher training load stimulates protein synthesis.
• Better anaerobic endurance in short-term intense efforts.

The benefits are not limited to muscles. The brain uses creatine for the same ATP restoration processes, so studies show better working memory, attention, and cognitive function. The effect is most pronounced in vegetarians, older adults, and during sleep deprivation when natural creatine stores are lower.

For older adults, creatine becomes a particularly valuable supplement. Together with resistance training, it helps combat sarcopenia, the age-related loss of muscle mass and strength, and also supports bone density and functional mobility in daily activities.

Research in the field of recovery shows less muscle fiber damage after intense training and faster glycogen restoration when creatine is taken together with carbohydrates.

However, it is important to maintain a realistic perspective. Creatine improves results on the margins but does not replace consistent training, balanced nutrition, and quality sleep. It is a tool that strengthens the foundation rather than replaces it.

How to properly use creatine: dosage, timing, and forms

The standard maintenance dose is 3–5 g per day, taken daily, on both training and rest days. Daily consistency is more important than exact timing, as muscle saturation with creatine is a cumulative process.

The loading phase means 20 g per day (4×5 g) for 5–7 days. This regimen allows muscles to saturate faster, but the same result is achieved after 3–4 weeks of taking 3–5 g. The loading phase is not necessary, and for some, it causes bloating or digestive discomfort.

When to take it? Timing has minimal significance. However, if you need to choose, studies show a slight advantage when taken after training together with carbohydrates or proteins, as the insulin response improves creatine uptake in muscle cells.

Water intake is essential. Creatine draws water into muscle cells, so when taking the supplement, you need to drink about 2.5–3 liters of water per day. Insufficient fluid intake can cause cramps or digestive issues.

Forms on the market differ based on scientific backing:

• Creatine monohydrate – the gold standard, best researched and cheapest form.
• “Creapure” form – certified German monohydrate with guaranteed purity.
• Kre-Alkalyn – a buffered form, positioned as gentler on the stomach.
• Tri-creatine malate – creatine combined with malic acid.
• Creatine blends– several forms in one product.

HCL, alkaline, malate, and blends have marketing promises but so far lack clear scientific advantage over monohydrate. For beginners, it is rational to choose simple creatine monohydrate and stick with it.

Side effects, safety, and myths: creatine, kidneys, and creatinine in blood tests

When taken at the recommended 3–5 g per day doses, creatine is safe for healthy adults. Over more than 30 years of clinical trials, no evidence has been found that the monohydrate form harms kidneys, liver, or heart.

Real possible side effects are limited and easily manageable:

• water retention in muscles – 1–2 kg weight gain in the first weeks as creatine draws water into cells;
• digestive discomfort – may occur when taking large doses at once or on an empty stomach;
• cramps – in rare cases, mostly due to insufficient daily fluid intake. 

Most common myths

Creatine is not a steroid, as it is an amino acid derivative, not a hormone; the International Olympic Committee and WADA do not include it on the list of banned substances. The claim that creatine causes baldness originated from one old study on DHT levels, whose results were not confirmed by later studies. Creatine also does not harm the kidneys of healthy people.

However, there are contraindications: people with kidney diseases, pregnant and breastfeeding women, and minors under 18 are advised to consult a doctor before starting use.

Creatine vs. creatinine – why is this important in blood tests?

These two terms are often confused but mean different things. Creatine is a supplement and a substance stored in muscles for energy production. Creatinine is a breakdown product of creatine, eliminated by the kidneys, and measured in blood tests as an indicator of kidney function.

Practical consequence: when taking creatine supplements, creatinine levels in the blood may be slightly elevated, but this does not indicate kidney damage, only increased muscle metabolism. Therefore, before a blood test, it is necessary to inform the doctor about creatine use so that the result is not mistakenly interpreted as kidney dysfunction.

Frequently asked questions about creatine

Does creatine harm health or kidneys?

No, when taken at the recommended 3–5 g per day doses, creatine is safe for healthy adults.

Long-term studies in which participants took monohydrate for up to 5 years showed no negative effects on kidneys, liver, or heart. In this aspect, creatine monohydrate is one of the best-studied sports supplements.

However, for those diagnosed with kidney diseases, diabetes, or other chronic illnesses, it is recommended to consult a doctor before starting to use it, as individual conditions may alter the metabolic load on the kidneys.

When is the best time to take creatine – before or after a workout?

The timing of intake has minimal significance because muscle saturation with creatine is a cumulative process. The most important thing is daily consistency, so a dose of 3–5 g should be taken every day, including rest days.

If you still choose a specific time, some studies show a slight advantage in taking it after a workout along with carbohydrates or a protein shake, as insulin improves absorption.

Practical advice: take it at the same time every day, for example, with breakfast or after a workout. This way, creatine becomes a habit and it is easier not to forget the dose.

Is creatine a steroid?

No, creatine is not a steroid and not a hormone. It is a natural amino acid derivative that the body synthesizes from arginine, glycine, and methionine, and additionally obtains from meat and fish. Chemically, it is a nutritional component, not an androgen or anabolic hormone.

Therefore, creatine is not on the doping list. The International Olympic Committee (IOC) and WADA (World Anti-Doping Agency) allow its use in professional sports without restrictions.

Is creatine suitable for women?

Yes, creatine is suitable for women, and the recommended dose is the same as for men: 3–5 g per day. Hormonal responses to creatine do not differ by sex, so a separate "female" variant is not needed.

The myth that women become "muscular" from creatine has no basis. Creatine itself does not increase muscle volume; resistance training and adequate protein intake in the diet are necessary for muscle mass growth.

Creatine also provides additional benefits for women: better working memory and attention, maintenance of bone density in older age (important during menopause), and less fatigue during menstruation.

Can creatine be taken with coffee or caffeine?

Yes, creatine can be taken with coffee or caffeine. Recent studies have disproved the previous fear that caffeine neutralizes the effect of creatine on muscles.

A standard amount of caffeine, such as a cup of coffee or a pre-workout drink, does not interfere with creatine's action and does not prevent muscle stores from being saturated.

However, if you experience digestive discomfort, take them separately: creatine in the morning with water, and coffee later. This distribution reduces stomach irritation without affecting the results.

How long does it take to feel the effects of creatine?

Taking 3–5 g per day without a loading phase, muscles become fully saturated within 3–4 weeks. With a loading phase (20 g per day for 5–7 days), saturation is achieved faster, about a week, but the final result is the same.

The first noticeable change is usually a 1–2 kg weight gain due to water in muscle cells. Strength and repetition increases in workouts become apparent later, when muscle phosphocreatine stores reach their maximum and allow for greater workout load.

Choosing the right form of creatine is important to achieve maximum results. At "Papildų pasaulis" you will find a wide range – from classic creatine monohydrate to the highest quality "Creapure" creatine, which is one of the purest on the market.

If you are looking for alternatives, you can try Kre-Alkalyn, tri-creatine malate, or a multi-form creatine mix. Visit the store in Vilnius, Visorių St. 2, or order online with fast delivery straight to your home, and let creatine help you achieve new strength and endurance results.