Creatine Monohydrate: A Simple, Evidence-Based Guide
Creatine is the most researched and most effective sports supplement there is. Here is what it does, how to take it, and why the kidney-damage worry is a myth for healthy people.
Few supplements live up to their marketing. Creatine monohydrate is the rare exception: it is cheap, extensively studied, and genuinely effective. The International Society of Sports Nutrition calls it the most effective nutritional supplement available for increasing high-intensity exercise capacity and lean muscle mass.
This guide covers what creatine does, how to take it, and the safety questions people ask most.
The essentials at a glance
- Creatine monohydrate is the most effective and well-evidenced supplement for high-intensity exercise and lean mass (ISSN position stand, 2017).
- A daily dose of 3–5 g is standard. An optional loading phase (~20 g/day split into 4 doses for 5–7 days) saturates muscles faster but isn't required.
- It is safe long-term: no compelling evidence of harm in healthy people, including no credible link to kidney damage (ISSN, 2017).
- Monohydrate is the proven, cheapest form, so there is no need to pay more for 'advanced' versions.
What creatine does
Muscles use a molecule called phosphocreatine to rapidly regenerate energy during short, hard efforts like a heavy set, a sprint, or a jump. Supplementing increases the muscles' creatine stores, allowing a little more high-intensity work, which over time supports greater gains in strength and lean mass. The effect is modest but real and consistent across many studies.
How to take it
The simplest approach is 3–5 g of creatine monohydrate every day, at any time. Within a few weeks the muscle stores fill up. For a faster effect, an optional 'loading' phase uses about 20 g/day split into four servings for 5–7 days, then drops to 3–5 g/day, but loading only changes the speed, not the end result. Consistency matters more than timing: it is taken daily, including on rest days.
Is creatine safe? The kidney myth
This is the most common worry, and the evidence is reassuring. The ISSN found no compelling scientific evidence that creatine harms otherwise healthy people, even with long-term use (studied up to 30 g/day for 5 years), and no credible link to kidney, liver, or heart problems in healthy users. One source of confusion is that creatine can slightly raise blood creatinine, a number labs use to estimate kidney function, but this reflects the supplement itself, not kidney damage. Anyone with existing kidney disease or taking medications should check with a doctor first.
Frequently asked questions
- Does creatine damage my kidneys?
- For healthy people, no. The ISSN found no credible evidence that creatine harms the kidneys, even with years of use. It can slightly raise the blood marker creatinine without indicating any kidney damage. People with kidney disease should consult a doctor first.
- Do I need to do a loading phase?
- No. Loading just fills the muscle stores faster. Taking 3–5 g a day reaches the same point within a few weeks, with no loss of benefit.
- Which form of creatine is best?
- Plain creatine monohydrate. It is the most studied, the most effective, and the cheapest. 'Advanced' forms cost more without proven added benefit.
References
- International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine (Kreider et al.) · Journal of the International Society of Sports Nutrition, 2017. Accessed 2026-06-05.
- Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show? (Antonio et al.) · Journal of the International Society of Sports Nutrition, 2021. Accessed 2026-06-05.
- Effect of creatine supplementation on kidney function: a systematic review and meta-analysis · BMC Nephrology, 2025. Accessed 2026-06-05.