Creatine, a nitrogenous compound synthesized naturally by the liver, kidneys and pancreas from the amino acids glycine and arginine, is today one of the most studied sports supplements in the history of scientific nutrition. Since its popularization in the 1990s, when Olympic athletes began to use it en masse, it has generated both enthusiasm and distrust.
Due to the publication of numerous investigations and its presence on the shelves of gyms and pharmacies, creatine continues to be the protagonist of debates among athletes, doctors and nutritionists. The problem is that, along with solid evidence, deep-rooted myths persist that distort its exact image.
Creatine action
Creatine is stored in muscles, mainly as phosphocreatine. This is a store of high-energy phosphates that helps create ATP (adenosine triphosphate) quickly during brief but intense activities. By increasing the availability of phosphocreatine, the athlete can maintain maximum power for slightly longer periods before the muscle turns to slower energy pathways.
But the supplement’s reach goes far beyond gym performance. In the last fifteen years, research has moved into unsuspected territories: neuroprotection, cognition, muscle aging and the adjuvant treatment of pathologies such as Duchenne muscular dystrophy or Parkinson’s disease.
Creatine has therefore ceased to be the exclusive property of bodybuilders and has become an object of interest in mainstream medicine.
Science-Backed Benefits
The strongest scientific consensus points to three areas of proven benefit.
The first is the performance in high intensity and short duration exercises: sprints, weightlifting, jumping and power sports. Meta-analyses published in journals such as Journal of Energy and Conditioning Learn and the British Journal of Sports Medication They show improvements of between 10% and 20% in maximum force production and repeat work capacity.
The second area is muscle mass gain. Creatine supplementation improves the effect of resistance training. This is, in part, because it allows more work to be done, which drives growth. It also causes some water retention within cells, which can help with long-term protein production. It is important to emphasize that Creatine does not build muscle on its own: it is the training that builds it, and creatine optimizes it.
The third, more recent, area concerns cognitive health and neuroprotection. Studies in older adults and in patients with mild head trauma suggest that creatine may improve working memory and reduce neuronal damage associated with sleep deprivation or oxidative stress. The brain is, after the muscle, the organ with the highest energy demand in the body, and the phosphocreatine-ATP system plays a relevant role in its functioning.
Most widespread myths, and dismantled
MYTH: “Creatine damages the kidneys“. This fear arises from confusing creatinine—the breakdown product of creatine, which appears in blood tests—with kidney damage. In healthy people, supplementation slightly raises serum creatinine without affecting glomerular function. Studies find no evidence of nephrotoxicity with standard doses.
TRUE: Caution if there is kidney disease. Although it does not cause damage to healthy kidneys, people with chronic kidney failure, a single kidney, or diagnosed kidney disease should consult their doctor before supplementing, as creatinine elimination may be compromised.
MYTH: “Creatine generates aggression“This myth confuses creatine with anabolic steroids. There is no credible biological mechanism or clinical evidence linking creatine with irritability or anger. The confusion originates in the cultural association between supplements and doping.
TRUE: May improve mood. Ironically, some studies suggest that creatine may have positive effects on patients with depression, especially women, possibly through its role in brain energy metabolism.
MYTH: “Creatine causes baldness“This myth is based on a single 2009 study in rugby that reported increased DHT. The small study was not replicated and measured DHT instead of hair loss. The accumulated evidence does not support this association.
TRUE: Accomplish initial water retention. Creatine increases muscle intracellular water content, which can translate into an increase of 1–2 kg in the first weeks. This phenomenon is benign, well documented, and does not equate to fat accumulation or pathological swelling.
MYTH: “Only suitable for bodybuilders“The evidence supports benefits in endurance athletes, older adults with sarcopenia, neurological patients and vegetarians, whose dietary intake of creatine is practically zero. Its clinical utility far exceeds the bodybuilding niche.
TRUE: Not everyone responds the same. There are 25–30% of non-responders whose muscles already have high levels of endogenous creatine and who do not experience appreciable improvements. Genetics, diet and the type of muscle fibers influence the individual response.
Forms of creatine
Creatine monohydrate is the most studied form and offers the best cost-effectiveness ratio. There is no solid evidence that more expensive forms—ethyl ester, hydrochloride, or buffered creatine—are superior in absorption or effectiveness.
The industry has been able to capitalize on consumer confusion, but science returns, time and again, to the monohydrate as the reference standard.
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