Separating evidence from misconceptions in one of the most studied supplements
Creatine has been widely used for decades, yet misconceptions about its safety persist.
For years, it was labelled as “bad for your kidneys”.
That narrative was built on a misunderstanding.
Why the confusion occurred
Creatine supplementation can slightly increase creatinine — a marker used to assess kidney function.
This can make it appear as though kidney function is impaired, even when it is not.
In healthy individuals, this has been consistently shown not to reflect actual kidney damage.
Multiple studies have demonstrated that creatine is safe when used appropriately in people without underlying kidney disease.
What the evidence actually shows
Creatine is one of the most extensively studied supplements in sports and exercise science.
- Significant increase in muscle creatine stores
- Meaningful improvements in strength
- Substantial gains in power output
- Modest increases in muscle mass
- Improved fatigue resistance and performance
- Emerging evidence for cognitive benefits, including memory and alertness
These effects are most pronounced in activities requiring short bursts of high-intensity effort.
How creatine works
Creatine supports the regeneration of ATP — the body’s immediate energy source.
This allows muscles to sustain high-intensity output for longer periods before fatigue.
The result is improved training capacity, which over time contributes to measurable performance gains.
Clinical use and dosing
For most individuals, creatine supplementation does not require complex protocols.
A daily dose of 3–5 grams is sufficient, effective and well tolerated.
Loading phases are not necessary for most people and may increase the likelihood of gastrointestinal discomfort without improving long-term outcomes.
When caution is appropriate
Creatine should be used cautiously in individuals with known kidney disease or where kidney function is being actively investigated.
As with any supplement, it is reasonable to review its use in the context of overall health, medications and training load.
Bottom line
Creatine is not a trend or a short-term performance hack.
It is one of the most extensively studied and clinically validated performance supplements available.
When used appropriately, it provides consistent, measurable benefits with a well-established safety profile.