Creatine

A reserve to quickly regenerate energy

Creatine is naturally present in the body, which produces part of it; meat and fish also provide it. In the muscle, part is stored in the form of phosphocreatine. This helps to quickly regenerate ATP, the molecule used to provide the energy necessary for contraction, by transferring a phosphate to ADP. This system intervenes particularly during brief and intense efforts.

Supplementation increases available reserves and can support the repetition of these efforts: bodybuilding series, accelerations or sprints. It does not replace all other energy systems and does not make each activity more efficient in the same way. The benefit depends on the type of effort, initial reserves and individual response, rather than an immediate sensation after taking.

Muscle gains and water

With progressive training, a better ability to repeat efforts can help get more work done and achieve additional gains in strength and muscle mass. This remains program support, not automatic muscle building. proteins, energy intake and recovery retain their roles; creatine acts by a different mechanism than dietary proteins.

The increase in reserves can be accompanied by an increase in body water, particularly in the muscles, and an initial weight gain. A measurement of lean body mass includes this water, so a rapid rise doesn't just represent newly built muscle tissue. It also does not correspond to an equivalent fat intake. In the longer term, we must distinguish this initial effect from the adaptations obtained with training.

Creatine is not intended to cause facial swelling, and studies cannot predict this effect in every person. Appearance can vary with several factors, including salt, sleep and habitual water fluctuations. A marked or persistent swelling deserves to seek its cause; Drinking excessively or becoming deliberately dehydrated is not an appropriate response to a change in weight after starting to take it.

Saturation and shutdown

Muscle reserves have a limited capacity. Once increased, a maintenance intake is mainly used to compensate for daily losses; multiplying doses does not multiply gains. Food intake and initial reserves may influence the response. Some people notice a clearer difference than others, which does not necessarily mean they should choose a different form of creatine or greatly increase the amount.

No scheduled alternation of doses and breaks is necessary to maintain the effect in a healthy adult using an appropriate dose. When stopping, reserves gradually return to their initial level over several weeks, with a possible drop in water and associated weight. This does not automatically make the muscle built disappear: maintaining the gains also depends on continued training and diet.

The kidneys and creatinine

The data available at usual doses are generally reassuring for renal function in the healthy adults studied. Creatine can, however, modestly increase blood creatinine, a substance used in some kidney filtration stones. This variation alone does not mean kidney damage, but it should not lead to ignoring an abnormal result: the caregiver interprets it with the context and, if necessary, other tests.

Kidney disease is a different situation from studies in healthy athletes. The decision to take creatine must then be adapted with the medical team. For other adults, a simple dose in accordance with the instructions avoids unnecessary doses and facilitates monitoring. To say that the data is reassuring is not to promise an absence of risk in each situation nor to justify unlimited quantities.

Hair, brain and the limits of promises

The link between creatine and hair loss is not established by current data. The 2025 twelve-week trial provides reassuring direct observation, while remaining limited to its population and duration. A fall that appears during supplementation deserves to be evaluated like any other fall; coincidence in time is not enough to determine the cause.

Creatine is also the subject of research on cognition, but these results do not justify promising a general mental gain with the sports protocol in this sheet. In 2024, the EFSA concludes that the data evaluated do not allow the claim of improvement in cognitive function to be established. Research in specific contexts also does not establish creatine as a substitute for sleep or sufficient recovery.