Creatine is one of the most talked about supplements in fitness and wellness. It’s often associated with building strength, supporting recovery and helping increase muscle mass. Some people also take creatine to support brain health and energy as they age.

What Is Creatine and How Does It Work?

Creatine is a naturally occurring substance made from amino acids. About half of your body’s creatine comes from protein‑rich foods, such as fish, milk and red meat. The rest is produced by the body in the liver, pancreas and kidneys.

In cells, creatine is stored mainly in skeletal muscle, where it is turned into phosphocreatine. Phosphocreatine helps produce adenosine triphosphate (ATP), the main energy molecule cells use for movement and muscle contraction.

Because ATP is used during short bursts of activity, such as lifting weights, sprinting or climbing stairs, creatine plays an important role as a quick source of energy for movement and strength.

By helping the body produce ATP more quickly, creatine can help:

• Support strength, workout intensity and recovery.
• Maintain healthy energy systems, especially during physical activity and as muscle function changes with age.
• Build muscle mass over time, especially when combined with resistance training.

Although the body can make creatine and get it from food, some people choose supplements to increase their intake.

What Are Creatine Supplements?

Creatine supplements are used to increase the amount of creatine available in the body. While creatine comes in several forms, creatine monohydrate is consistently supported by research for safety. It is also the most widely studied dietary supplement used in health, fitness and professional sports.

Creatine supplements are available in several forms, including:

• Powders
• Capsules
• Flavored drinks and products combined with protein or carbohydrates

Even though many versions are marketed with bold claims, creatine monohydrate remains the preferred choice because it is well‑researched, affordable and shown to work reliably.

What Are the Benefits of Creatine Supplements?

Creatine is best known for its role in strength and improving athletic performance. When combined with resistance training, creatine can help support muscle growth and increased strength. It’s commonly used by athletes in professional sports to help maintain performance during high‑intensity exercise.

Creatine may also help:

• Support muscle recovery after workouts
• Help older adults maintain strength and mobility
• Support brain function
• Reduce the risk of muscle cramping and dehydration for some individuals

Who Can Take Creatine and Who Shouldn’t?

Creatine can be helpful for certain people, especially when used as part of an active, balanced lifestyle. Creatine may benefit:

• Athletes or active adults looking to increase strength or improve workout performance
• Older adults who want to support muscle health as they age
• Vegetarians or vegans who get less creatine from food sources
• People looking to support exercise recovery or mental focus

Creatine may not be right for everyone. Extra caution is recommended for people with diagnosed kidney disease or other kidney conditions, since their kidneys may already have difficulty filtering creatinine, a natural byproduct of creatine.

Creatine is also not recommended for people who are pregnant or breastfeeding, or for anyone with underlying health conditions.

If you’re thinking about taking it, talk to your doctor to determine whether creatine is right for you.

What Does the Research Say?

Creatine is one of the most widely researched supplements in exercise and nutrition science. Studies continue to explore how it supports physical performance, recovery and overall health.

Energy and muscle recovery

Creatine helps the body reuse energy more efficiently. This can support short, powerful movements and strength‑based workouts. Research shows creatine may help:

• Improve workout performance
• Reduce fatigue during repeated efforts
• Support faster recovery between exercise sessions

“There is some evidence that taking creatine around strength training workouts may be more beneficial, but it’s not clearly proven to be better than taking it at any other time of day,” says Mary Ella B. Wood, DO, an integrative medicine physician at Northwestern Medicine. “Consistency matters more than timing. Choose a time of day that fits easily into your routine.”

Cognition and brain health

Some studies show creatine may support memory, processing speed and mental clarity. These effects are most noticeable in older adults or during periods of stress, such as lack of sleep.

“Although creatine is best studied for its role in skeletal muscle energy metabolism, it also plays a role in brain energy metabolism. This is why scientists are currently studying its potential for cognitive and healthy aging benefits,” says Dr. Wood. “The current evidence is mixed, but some data support benefits for memory, attention and processing speed.”              

Healthy aging

Creatine may help improve age‑related muscle loss when combined with resistance exercise. Research shows older adults who use creatine alongside strength training can experience better stamina, balance and improved strength over time.

Kidney health

Creatine may cause a small, temporary rise in blood creatinine levels due to normal metabolism in healthy adults, but this does not lead to kidney issues in people who do not have a kidney condition.

How To Choose a Safe, High‑Quality Creatine Supplement

Dietary supplements, including creatine, are not approved by the U.S. Food and Drug Administration (FDA), so quality can vary. When selecting creatine, look for products that:

• List creatine monohydrate as the only ingredient
• Are third‑party tested
• Contain no fillers, artificial colors or added sugars

Creatine monohydrate powder is often the most affordable and reliable option. Third‑party certification is especially important because creatine is widely used in professional sports and should meet strict purity standards.

How Much Creatine Do You Need?

For most adults, typical recommended amounts for creatine include:

• 3 to 5 grams per day to support strength, performance and muscle mass
• An optional “loading phase” of 20 grams per day (split into four doses) for five to seven days, followed by 3 to 5 grams daily

Many people find that skipping the loading phase and sticking with 3 to 5 grams per day is effective and easier on the stomach.

How Should You Take Creatine?

Creatine is easy to take and doesn’t require special timing. It can be mixed into:

• Water
• Smoothies
• Electrolyte drinks
• Protein shakes

Taking creatine with a meal that includes protein or carbohydrates may help absorption.

Creatine Side Effects and Risks

Most people tolerate creatine well, especially when used at recommended amounts. But some individuals may notice mild side effects, such as:                 

• Digestive discomfort, especially with high amounts of creatine
• Temporary weight gain from increased water in the muscles
• Mild bloating or gas                                                                          

Creatine is generally safe for long‑term use in healthy adults, but people with kidney disease or reduced kidney function should not take it. Creatine can raise creatinine levels on blood tests, which may complicate lab results even when kidney function is normal.

“While creatine is well tolerated at the recommended amount of 3 to 5 grams daily, some people report bloating or retained water weight,” says Dr. Wood. “Gastrointestinal bloating or weight gain are more often linked to higher than recommended doses. To minimize side effects, take it with food and mix it well with liquid.”

How Does Creatine Fit Into a Healthy Routine?

Creatine works best when it’s part of an overall healthy routine — not a standalone solution. A balanced approach may include:

• Hydration: Creatine pulls water into muscle cells, so staying hydrated helps prevent discomfort and keeps muscles functioning well.
• Sleep: Quality sleep supports muscle repair and recovery, helping the body respond better to creatine and exercise.
• Nutrition: Balanced meals with enough protein and essential amino acids support muscle recovery. Creatine works best when paired with regular strength training and nutritious meals.

Creatine is not a magic solution, but it can complement a thoughtful approach to health and fitness.