Creatine is one of the most widely researched sports supplements in the world, but it is often misunderstood. While many people associate it with bodybuilders and athletes trying to increase muscle size, research suggests its potential benefits may extend beyond the gym.

Found naturally in the body and available through foods such as red meat and fish, creatine plays an important role in producing energy, particularly during activities that require short bursts of high intensity. Today, studies are exploring its possible role in muscle health, exercise recovery, brain function and healthy ageing.

However, questions remain about its safety. Concerns about weight gain, kidney damage, dehydration and other side effects continue to circulate online. Experts say understanding what creatine actually does can help separate scientific evidence from common myths.

What Is Creatine and How Does It Work?

Creatine is an amino acid derivative that the body produces naturally from the amino acids glycine and arginine. It can also be obtained through dietary sources, particularly animal-based protein foods.

The highest concentrations of creatine are found in skeletal muscle, although smaller amounts are also stored in organs including the brain, heart, liver and kidneys.

According to Tamberlyn Blinsink, ND, MPH, scientific researcher at Solaray, creatine can bind with phosphate groups to form phosphocreatine, which acts as an energy reserve. 'This phosphorylated form serves as an energy reservoir that can be broken down for direct energy production and replenishment of ATP,' she explains.

ATP (adenosine triphosphate) is the body's primary energy source. During intense exercise, such as sprinting or weightlifting, muscles rapidly use ATP. Creatine helps replenish these energy stores, allowing muscles to perform for longer.

Creatine Benefits for Muscle Strength and Exercise

Gym / Muscle Strength
Creatine helps support energy production in tissues with high energy demands, including muscles, the heart and the brain YuliiaKa via Magnific

Creatine's best-established benefit is its ability to improve strength and exercise performance, particularly when combined with resistance training. Research has consistently shown that creatine supplementation alongside weight training can increase muscle strength, anaerobic capacity and lean body mass.

Blinsink says studies have demonstrated that creatine can support improvements in 'muscle strength, anaerobic capacity, and lean body mass' when paired with resistance exercise.

The supplement may also aid recovery by helping restore muscle glycogen levels and reducing muscle damage following intense activity.

Although many studies have focused on male athletes, emerging evidence suggests women and older adults may also benefit.

'Most of the research has been performed in male athletes, but there are some studies that also show some benefit in women and older, sedentary populations,' Blinsink says.

Can Creatine Help People Who Do Not Exercise?

Creatine is often marketed towards gym-goers, but experts say its effects are not limited to athletes. Because creatine supports energy production in tissues with high energy demands, it may still play a role in people who do not regularly participate in intense exercise.

'For athletes and non-athletes, this phosphorylated form can serve as a reservoir for energy, especially in tissues that have a high demand for energy, like heart or skeletal muscle,' Blinsink explains.

This has led researchers to investigate whether creatine may have broader applications, including supporting muscle preservation as people age.

Loss of muscle mass and strength, known as sarcopenia, becomes increasingly common with ageing and can affect mobility and independence. Creatine combined with resistance exercise is being studied as a possible strategy to help maintain muscle function.

Creatine and Brain Health

While creatine research has traditionally focused on physical performance, newer studies are investigating its effects on cognition and brain health.

Dr Anil Shah, double board-certified facial plastic surgeon and wellness expert, says creatine replenishes phosphocreatine stores in both muscles and the brain.

'While it's best known for improving strength and exercise performance, growing research supports its role in neuroprotection, cognitive resilience, and even sarcopenia prevention in older adults,' he says.

Some studies suggest creatine supplementation may support memory and cognitive performance, particularly in situations where the brain experiences increased energy demands. Dr Shah highlights research suggesting creatine may help reduce some effects of sleep deprivation.

'Some studies have found that people taking creatine performed better on certain cognitive tasks after sleep loss compared with those who received a good night's sleep, but did not supplement,' he says.

However, researchers note that more long-term studies are needed before creatine can be recommended specifically for cognitive enhancement.

How Much Creatine Should You Take?

The most commonly studied dosage for creatine monohydrate is 5g per day.

Blinsink says this amount has been extensively researched for improving muscle strength and supporting muscle growth.

Some people choose to begin with a loading phase, which usually involves taking around 20g daily split into smaller doses for five to seven days. This can increase muscle creatine stores more quickly but is not essential.

For potential cognitive benefits, some researchers have explored higher doses. Dr Shah says doses between 10g and 20g daily may be considered when targeting brain-related effects, although more research is needed.

When it comes to timing, consistency appears to matter more than the exact time of day. 'Think about creatine like a sponge,' Dr Shah says. 'Once your body has enough of it, consistency is what matters most to maintain the benefits, not the specific hour you take it.'

Common Creatine Side Effects and Safety Concerns

Creatine is generally considered safe for healthy adults when used appropriately, but some people may experience side effects.

The most commonly reported issues include:

  • Temporary weight gain
  • Gastrointestinal discomfort
  • Increased water retention

Blinsink explains that early weight gain is usually linked to water changes rather than fat gain. 'Weight gain associated with the initiation of creatine supplementation appears to be due to a change in total body water,' she says.

Creatine is an osmotically active molecule, meaning it draws water into muscle cells. This can increase body weight during the early stages of supplementation, but this effect is usually temporary.

Does Creatine Cause Kidney Damage or Dehydration?

One of the biggest myths surrounding creatine is that it damages the kidneys.

Current evidence does not show that creatine monohydrate increases kidney damage in healthy individuals. 'Renal function in terms of filtration rates and toxin removal does not seem to be affected by supplemental creatine,' Blinsink says.

However, people with existing kidney conditions or those taking medications that affect kidney function should speak with a healthcare professional before using creatine.

Creatine has also been wrongly associated with dehydration and muscle cramps. Studies have not found evidence that it increases the risk of either issue.

Who Should Be Cautious With Creatine?

Although creatine has a strong safety profile, it may not be suitable for everyone.

People with kidney concerns, those taking medications that affect renal function, or individuals using diuretics should seek medical advice before starting supplementation.

Pregnant or breastfeeding women, and minors under 18 should also avoid creatine or consult a doctor before using it.

Blinsink recommends discussing supplement use with a healthcare professional to determine whether it is appropriate based on individual health needs.

The Bottom Line

Creatine remains one of the most researched supplements available, with strong evidence supporting its role in improving strength, exercise performance and lean muscle mass.

Emerging research suggests it may also have potential benefits for brain health, recovery and healthy ageing, although some areas require further investigation.

For most healthy adults, creatine monohydrate at a daily dose of around 5g appears to be both effective and well tolerated. While it is not a replacement for a balanced diet, regular exercise or good sleep, it may be a useful addition for people looking to support muscle and overall health.

Frequently Asked Questions

  • What are the benefits of creatine?
    Creatine can improve muscle strength, exercise performance, and may support brain health and healthy ageing.
  • Is creatine safe to use?
    Creatine is generally considered safe for healthy adults when used appropriately, but consult a healthcare professional if you have health concerns.
  • Does creatine cause kidney damage?
    Current evidence does not show that creatine monohydrate increases kidney damage in healthy individuals.
  • How much creatine should I take daily?
    The most commonly studied dosage for creatine monohydrate is 5g per day.
  • Can creatine help with brain health?
    Emerging research suggests creatine may support cognitive performance and neuroprotection, but more studies are needed.
Read more