What is creatine good for?
Last updated: June 2026 · Reviewed by the FactoWiki Editorial Team for clarity and source accuracy
Why creatine is the most-researched sports supplement, its emerging cognitive uses, and the kidney myth explained.
Key takeaways
- Creatine monohydrate is the most-researched sports supplement, proven for strength and power.
- Emerging evidence suggests cognitive benefits under stress, but that's less settled.
- The kidney-harm fear is largely unsupported in healthy people; kidney patients should check first.
What creatine is
Creatine is a compound your body makes and stores in muscle, where it helps regenerate energy for short, intense efforts. You also get it from meat and fish. As a supplement, creatine monohydrate is one of the most-studied substances in all of sports nutrition, with a large and consistent evidence base — which sets it apart from the many performance ingredients sold on hype alone.
Strength, power and muscle
Creatine's core benefit is well established: it improves performance in short, high-intensity, repeated efforts — think lifting, sprinting and similar — and supports gains in strength and muscle when combined with resistance training. The effect is real and reproducible across many studies. It works best for activities relying on short bursts of power rather than long endurance, and it complements training rather than replacing it.
The emerging cognitive angle
A newer area of research looks at creatine and the brain, since the brain also uses this energy system. Early evidence suggests possible cognitive benefits, particularly under stress such as sleep deprivation, and possibly in people with lower baseline creatine (like some vegetarians). This is promising but less settled than the muscle evidence, so treat 'creatine for the brain' as emerging rather than proven.
How to take it
Creatine monohydrate is the form with the evidence — there's rarely a reason to pay more for fancier versions. A common approach is around 3–5 g a day; an optional 'loading' phase of higher doses for a week saturates muscle faster but isn't necessary. It's taken daily, including on rest days, and consistency matters more than timing. A little extra water retention in muscle is normal and not the same as fat gain.
The kidney myth
The most persistent concern about creatine is that it harms the kidneys, and for healthy people the research has largely not borne this out — it appears safe at recommended doses in those with normal kidney function. The sensible exceptions are people with existing kidney disease or risk factors, who should check with a doctor first. Staying hydrated is reasonable general advice.
Who it suits
Creatine is one of the few supplements where the evidence genuinely supports the marketing, for the right goal. If you do resistance or power-based training, it's among the most effective, best-value options available. If your goals are pure endurance, or you have kidney concerns, the case is weaker or warrants medical input. As always, it supports a good training and nutrition foundation rather than substituting for it.
Related guides
Frequently asked questions
What does creatine do?
It improves short, high-intensity performance and supports strength and muscle gains with resistance training; brain benefits are emerging.
Is creatine safe for your kidneys?
In healthy people with normal kidney function, research largely supports its safety; those with kidney disease should check with a doctor.
Which form of creatine is best?
Creatine monohydrate has the evidence and best value — fancier forms rarely justify the cost.
Do I need to load creatine?
No — loading saturates muscle faster but isn't necessary; around 3–5 g daily works with consistency.
This article is general information, not medical advice. See our medical disclaimer, and talk to a qualified healthcare professional about your own situation.