Creatine Monohydrate: Benefits, Dosage and Safety

What is creatine and how does it work?

Creatine is a compound your body makes from amino acids, mainly in the liver and kidneys, and that you also get from meat and fish. Around 95% of it is stored in skeletal muscle, largely as phosphocreatine. When you do a short, all-out effort – a heavy set, a jump or a sprint – phosphocreatine rapidly regenerates ATP, the molecule that powers muscle contraction.

Your body produces about 1 g of creatine a day, and a diet that includes meat and fish provides roughly another 1–2 g. That keeps your stores at a normal level, but not full. According to the International Society of Sports Nutrition (ISSN), supplementation can raise muscle creatine and phosphocreatine by about 20–40%. People who eat little or no meat, such as vegetarians and vegans, usually start with lower stores and may notice larger effects.

What does the evidence show?

The 2017 ISSN position stand by Kreider and colleagues describes creatine monohydrate as the most effective nutritional supplement currently available for increasing high-intensity exercise capacity and lean body mass during training. With more stored energy, you can often squeeze out an extra rep or two per set; over weeks, that extra work adds up to modestly greater gains in strength and muscle than training alone.

The NIH Office of Dietary Supplements notes that creatine improves strength, power, repeated maximal efforts and sprint performance, but offers little benefit for mostly aerobic exercise lasting more than a couple of minutes, such as long-distance running. Benefits have been seen in men and women and in younger and older adults. The latest ISSN review of common questions (Antonio and colleagues, 2025) points out that the effects on muscle are much clearer when creatine is combined with exercise.

Keep expectations realistic: creatine is a small boost on top of good training, enough protein and calories, and sleep – not a replacement for them. Some people respond less than others, often those whose muscle creatine was already high.

How to take creatine: dose and timing

The simplest approach is 3–5 g of creatine monohydrate every day, including rest days. At this dose, your muscles become saturated in about 3–4 weeks. If you want faster results, you can do a loading phase: about 20 g a day, split into four doses of 5 g, for 5–7 days, then 3–5 g a day. Loading gets you to the same place sooner, but it isn't necessary and more often causes stomach upset.

Timing seems to matter little. Research on taking creatine before versus after training shows small differences at most, so take it whenever you'll remember – many people mix it into a drink or a meal. Consistency is what counts. There's no need to cycle it on and off.

• Standard dose: 3–5 g per day, every day.
• Optional loading: about 20 g per day in 4 doses of 5 g for 5–7 days, then 3–5 g per day.
• Timing: any time of day; taking it with a meal may be easier on the stomach.
• Form: creatine monohydrate is the most studied form; other forms have not been shown to work better.

Is creatine safe?

For healthy adults, creatine monohydrate has a strong safety record. The ISSN position stand concluded that there is no compelling evidence that short- or long-term use at recommended doses harms healthy people, and the NIH Office of Dietary Supplements considers it safe for healthy adults. The most common effect is weight gain, typically 1–2 kg in the first weeks, mostly from extra water stored inside the muscle. Large single doses can cause stomach discomfort, which is why loading doses are split up.

Kidney concerns come up often. A 2019 meta-analysis by de Souza e Silva and colleagues found that creatine supplementation did not cause kidney damage at the doses and durations studied. One practical detail: creatine can slightly raise creatinine, a blood marker used to estimate kidney function, without any real kidney problem. If you're having blood tests, tell your doctor you take creatine so the result is interpreted correctly.

Common myths about creatine

Creatine has been studied for decades, but several myths persist. The ISSN reviews of common questions and misconceptions (Antonio and colleagues, 2021 and 2025) address the most frequent ones.

Most of these myths come from isolated findings, anecdotes or confusion between creatine and anabolic drugs. Here is what the evidence says about each one.

• 'Creatine causes hair loss': this idea comes from a single 2009 study in rugby players that found a rise in DHT, a hormone linked to hair loss, without measuring hair. It has not been replicated. In a 12-week randomised trial published in 2025, Lak and colleagues found no differences in DHT or hair measures between 5 g a day of creatine and placebo.
• 'Creatine damages healthy kidneys': studies at recommended doses have not shown kidney damage in healthy people.
• 'It's just water weight': the early gain is mostly water inside the muscle, but over months of training, creatine helps you do more work and gain more lean mass.
• 'Creatine is a steroid': it isn't. It's a nutrient found naturally in meat and fish, with no hormonal action.
• 'It causes dehydration and cramps': research has not supported this in healthy people.

Who should talk to a doctor first?

Most research involves healthy adults, so some groups should get professional advice before using creatine. This doesn't mean creatine is dangerous for them, only that their situation needs individual assessment.

Talk to your doctor or a registered dietitian first if any of these applies to you. Also stop and seek advice if you notice unusual symptoms after starting.

• Kidney disease or reduced kidney function, or conditions that can affect the kidneys, such as diabetes or high blood pressure.
• Regular use of medication, especially drugs that affect the kidneys.
• Pregnancy or breastfeeding.
• Being under 18.
• Any other chronic health condition.

How to choose a creatine product

Supplements are not tested before sale in the same way as medicines, and contamination does happen. Look for plain creatine monohydrate with a single ingredient and a clear dose per serving (usually 3–5 g). Products tested by an independent third-party programme, especially those that screen for contaminants and banned substances, offer extra assurance – and are essential if you compete in drug-tested sports.

You don't need expensive versions, blends or 'advanced' formulas. Powder is usually the most economical format; capsules are fine too but often need several to reach 3–5 g. Store it in a cool, dry place and mix it well, since it doesn't dissolve completely in cold water.