Creatine monohydrate: level of evidence and practical use

Creatine monohydrate, is one of the most extensively researched supplements in sports nutrition. After decades of literature and hundreds of studies, it has become a substance with a relatively strong level of evidence for supporting short-duration, high-intensity performance. Even so, a great deal of misinformation still circulates around it: claims that it harms the kidneys, causes bloating, or necessarily requires a loading phase are often heard.

In this article, we cover at a general-information level what creatine is, which performance components it makes a difference in, and how it is used in practice. At O’Athletic Sky in Skyland Sarıyer, we always discuss supplements only after the foundation of training and nutrition has been established, because no supplement replaces consistent training, adequate protein intake and sleep.

What does creatine do in the body?

Creatine is stored in muscle cells as phosphocreatine. In short, high-intensity efforts, ATP, the cell's energy unit, is depleted rapidly; phosphocreatine contributes to the fast resynthesis of this ATP. Increasing intramuscular creatine stores raises the capacity of this fast energy system to some extent.

The practical result shows up in repeated high-intensity efforts: being able to do a few more reps in a heavy set, or seeing slightly less performance drop in repeated sprints. These gains are not dramatic, but they can have a meaningful effect through training volume accumulated over time.

Which sports is it better suited to?

Strength and power sports, disciplines involving sprinting and jumping, team sports and bodybuilding are the areas where the most noticeable benefit is expected. In long-duration endurance sports, the direct performance contribution is reported to be more limited; even so, these athletes may see indirect benefit in the high-intensity portions of training or in strength sessions.

Which form, which dose?

There are many forms of creatine on the market: hydrochloride, ethyl ester, buffered forms, liquid blends. The most studied form in the literature, with the best-demonstrated effectiveness, is creatine monohydrate. There is no strong evidence that other forms are superior to monohydrate, yet they are generally more expensive. The practical choice is therefore monohydrate; micronized monohydrate disperses better in water and may reduce the likelihood of stomach discomfort.

• Loading protocol: about 20 grams per day for 5-7 days, divided into four doses; followed by maintenance.
• Direct maintenance: about 3-5 grams per day without a loading phase; stores fill up within a few weeks.
• By body weight: an approach of roughly 0.03 grams per kilogram is also used for maintenance.
• Timing: any time of day; consistency matters more than timing.
• How to take it: with plenty of water; taking it with a meal containing carbohydrates or protein may support absorption.

The loading protocol fills the stores faster and may make sense if a competition is near. For athletes who are not in a hurry, the direct maintenance dose is sufficient and has a lower likelihood of stomach side effects.

Side effects and safety

There is a broad safety literature on long-term creatine use in healthy individuals, and the reported rate of serious side effects is low. There is no strong evidence that it causes kidney damage in people with normal kidney function. It is known that creatine use can raise blood creatinine levels somewhat; because this can lead to misunderstandings when interpreting lab results, it is appropriate to inform your physician about your use.

The most common real effect is a weight gain of around 1-2 kilograms in the first weeks. This increase stems largely from water retention inside the muscle and occurs within the muscle cell; it does not mean subcutaneous bloating. Still, in weight-class sports this increase needs to be factored into planning. At high doses, some people may experience stomach discomfort or bloating; splitting the dose usually resolves this.

People with kidney disease, liver conditions or regular medication use, as well as pregnant and breastfeeding individuals, should consult a healthcare professional before use. For young athletes, the decision to use it should be made through a joint assessment by the family and a physician.

Realistic expectations

Creatine does not build muscle; it is a support that can make it easier for training to build muscle. Its effect varies from person to person: the difference may be smaller in athletes whose intramuscular creatine levels are naturally already high. In people who eat little meat and fish, particularly vegetarians and vegans, baseline levels are generally lower, so the response may be more pronounced.

• Expected: a small but consistent improvement in repeated high-intensity efforts.
• Expected: the capacity to increase training volume over time.
• Not to be expected: an instant performance boost after a single dose.
• Not to be expected: a marked gain in endurance performance.
• Not to be expected: making up for poor training or inadequate nutrition.

Is a break needed?

There is no strong evidence supporting the need for cycling, that is, taking breaks at certain intervals. It is reported that the body's own creatine production decreases somewhat during use and returns to normal within a few weeks after stopping. Continuous use and periodic use are therefore both practically feasible; the decision is made in line with the athlete's goals and preferences.

What to look for when choosing a product

Product quality varies in the supplement industry. Products carrying independent quality verification or an anti-doping test certificate are important, especially for licensed athletes; unverified products carry the risk of undeclared substances. It is preferable that the label clearly states “creatine monohydrate” and that it contains no unnecessary blends. If you are a licensed athlete, it is advisable to share every product you use with your club physician or sports dietitian.

Creatine monohydrate stands out as a strong-evidence, low-cost option; however, its value only emerges when it sits on a solid foundation of training and nutrition. At O’Athletic Sky in Sarıyer, Istanbul, after starting with athlete testing and building the training plan, we consider supplementation as a part of that whole.