Creatine: Uses, Benefits, Dosage & Safety

Last updated: June 2026 · Reviewed by the FactoWiki Editorial Team for clarity and source accuracy

Quick summary

Creatine is one of the most studied and effective sports supplements, with solid evidence for strength and high-intensity performance. Newer research also hints at modest cognitive benefits, especially when you're sleep-deprived or older.

What is Creatine?

Creatine is a compound the body makes and also gets from meat and fish, stored mainly in muscle as phosphocreatine and used to regenerate energy during short, intense effort. Creatine monohydrate is the most-studied and cheapest form, and it is among the best-evidenced supplements of any kind. It is marketed for strength, muscle and power, and increasingly for brain health.

What Creatine is commonly used for

Creatine is used in supplements as nutritional support, not as a treatment for any medical condition.

How Creatine works

During brief, intense activity, muscles rapidly regenerate their energy currency (ATP) using phosphocreatine. Supplementing increases muscle phosphocreatine stores, allowing more work before fatigue — the basis for its well-established performance benefits. The brain also uses creatine for energy, which is why researchers are exploring cognitive effects, particularly when the brain is stressed by sleep deprivation or ageing.

What the evidence says

Here's an honest snapshot of what published research suggests about Creatine — including where the evidence is limited.

Creatine monohydrate has strong, consistent evidence for improving strength, power and high-intensity exercise performance, making it one of the best-supported sports supplements. (PubMed research)
Emerging research suggests modest cognitive benefits, more apparent under sleep deprivation or in older adults. (PubMed research)
Long-term studies support its safety in healthy people, and the common 'creatine harms the kidneys' claim is not supported in those with normal kidney function. (PubMed research)

Typical dosage used in studies

A common approach is 3-5 g/day of creatine monohydrate; an optional 'loading' phase (around 20 g/day split over 5-7 days) fills stores faster. It is taken with water, and consistency matters more than timing. This is research information, not a recommendation.

Side effects and safety

Creatine is very well studied and generally very safe in healthy people. The main effect is a small weight gain from water drawn into muscle, and large single doses can cause stomach upset, avoided by splitting the dose.

Medication interactions and who should avoid Creatine

Medication & safety check

People with kidney disease should check with a doctor before using creatine, since it is cleared by the kidneys. Staying well hydrated is sensible. Pregnancy and breastfeeding use should be discussed with a clinician.

This is general information, not personal medical advice. If you take any medication, confirm it's safe to combine with Creatine with your doctor or pharmacist first.

Sources & further reading

The evidence summary above is drawn from these sources. For general, authoritative background you can also consult:

Frequently asked questions

Does creatine actually work?

Yes — for strength and high-intensity performance it's one of the best-evidenced supplements available, with decades of consistent research.

Does creatine help the brain?

Emerging evidence suggests modest cognitive benefits, most apparent when sleep-deprived or older. It's promising but newer than the exercise evidence.

Is creatine safe for the kidneys?

In people with normal kidney function, long-term studies support its safety; the kidney-damage claim isn't supported. Those with kidney disease should check first.

How should I take creatine?

Commonly 3-5 g/day of monohydrate with water; an optional loading phase fills stores faster. Consistency matters more than timing.

Will creatine make me gain weight?

It can cause a small increase from water drawn into muscle, which is normal and not fat gain.