Creatine: What Patients Should Know About Muscle, Strength, Brain Health, and Safety

An Evidence-Based Guide from Emcura Medical Clinic

By a Board-Certified Family & Integrative Medicine Physician

Creatine has long been associated with athletes and bodybuilding, but research has expanded our understanding of this naturally occurring compound. Today, creatine is one of the most extensively studied sports supplements, with established benefits for strength, power, and high-intensity exercise performance and growing interest in healthy aging, muscle preservation, and brain health. (Office of Dietary Supplements)

Despite its popularity, many patients still have questions: Is creatine a steroid? Does it damage the kidneys? Does it cause weight gain? Is it only useful for athletes? And which type should you take?

At Emcura Medical Clinic, we believe supplements should be approached with the same principles as medications: understand the evidence, consider individual health needs, choose quality products, and use an appropriate dose.

What Is Creatine?

Creatine is a naturally occurring compound made by the body from amino acids. It is not a steroid, hormone, protein, or peptide.

Most of the body's creatine is stored in skeletal muscle, where it helps rapidly regenerate adenosine triphosphate (ATP)—the primary energy source used by cells.

Your body produces creatine naturally, and you also obtain it from foods, particularly:

• Beef

• Pork

• Salmon

• Tuna

• Other fish and animal products

People who eat little or no meat may have lower dietary creatine intake.

What Does Creatine Do?

During short periods of intense activity, muscles need energy quickly.

Stored phosphocreatine helps regenerate ATP, allowing muscles to continue producing energy during activities such as:

• Weightlifting

• Sprinting

• High-intensity interval training

• Repeated explosive movements

• Competitive sports

This is why creatine has its strongest evidence for activities involving repeated short bursts of high-intensity effort rather than prolonged endurance exercise. (Office of Dietary Supplements)

The Most Established Benefit: Strength and Exercise Performance

Creatine's strongest evidence is in exercise and sports performance.

Supplementation can improve:

• Strength

• Power

• High-intensity exercise capacity

• Training performance

Over time, improved training capacity can also contribute to gains in lean mass when creatine is combined with resistance exercise. (Office of Dietary Supplements)

Creatine should not be viewed as a replacement for training. It helps support the body's ability to perform and adapt to appropriate exercise.

Creatine and Muscle Growth

Creatine is commonly associated with muscle gain—and for good reason.

When combined with resistance training, creatine may help support increases in muscle mass by allowing individuals to train harder or perform more total work.

Creatine also increases water within muscle cells, particularly early in supplementation.

This means the scale may increase even before significant new muscle tissue develops.

Does Creatine Cause Weight Gain?

It can.

Some people notice an increase in body weight after beginning creatine because the muscles retain additional water.

This is not the same as gaining body fat.

For many people, the increased intracellular water contributes to a fuller muscular appearance.

The amount of weight gained varies considerably between individuals.

Creatine and Healthy Aging

Maintaining muscle becomes increasingly important as we age.

Beginning in adulthood, muscle mass and strength gradually decline, and this process can accelerate later in life.

Loss of muscle can contribute to:

• Weakness

• Falls

• Reduced mobility

• Loss of independence

• Poorer metabolic health

For middle-aged and older adults, creatine is increasingly being studied as an adjunct to resistance training, adequate protein intake, and an active lifestyle.

It should not replace these fundamentals, but it may complement them.

Creatine for Women

Creatine is not just a supplement for male athletes.

Women also rely on the creatine-phosphocreatine system for cellular energy, and creatine may be useful for women interested in:

• Maintaining muscle

• Improving strength

• Supporting resistance training

• Preserving physical function with aging

Research continues to investigate whether creatine may have additional benefits during different stages of a woman's life.

The important point is that women do not need to avoid creatine simply because it has traditionally been marketed toward men.

What About Perimenopause and Menopause?

Preserving muscle and bone-supporting strength becomes particularly important during and after the menopausal transition.

Creatine may be considered as one component of a broader healthy-aging strategy that includes:

• Progressive resistance training

• Adequate protein

• Calcium-rich foods

• Appropriate vitamin D intake

• Healthy sleep

• Cardiovascular exercise

• Appropriate evaluation and treatment of menopausal symptoms

Creatine itself should not be marketed as a treatment for menopause or osteoporosis, but its potential role in supporting muscle health makes it an interesting area of ongoing research.

Creatine and Brain Health

Muscle is not the only tissue that requires large amounts of energy.

The brain also uses creatine and phosphocreatine as part of its cellular energy system.

This has led researchers to investigate whether supplementation might influence:

• Memory

• Attention

• Processing speed

• Mental fatigue

• Cognitive performance

A 2024 systematic review and meta-analysis found potential improvements in memory and some measures of attention and processing speed, but evidence was not consistently positive across all cognitive outcomes, and certainty ranged from moderate to low. Other evidence reviews have been more cautious. (PubMed)

For now, creatine should not be considered a proven treatment for dementia or cognitive impairment.

However, brain health remains one of the most interesting areas of creatine research.

Which Type of Creatine Is Best?

Walk into a supplement store and you may see numerous varieties:

• Creatine monohydrate

• Creatine hydrochloride

• Buffered creatine

• Creatine nitrate

• Micronized creatine

• Creatine blends

For most people, the simplest answer is also the best:

Creatine Monohydrate

Creatine monohydrate is the most widely studied form and is generally the form we recommend when supplementation is appropriate. (Office of Dietary Supplements)

More expensive forms have not consistently demonstrated meaningful advantages over standard creatine monohydrate.

How Much Creatine Should You Take?

A common maintenance dose is:

3–5 grams of creatine monohydrate daily

Another strategy involves a loading phase:

Approximately 20 grams per day, divided into four doses, for 5–7 days, followed by 3–5 grams daily. This protocol has commonly been used in research. (Office of Dietary Supplements)

However, loading is not required.

Taking a smaller daily dose will gradually increase muscle creatine stores without a loading phase.

For most patients interested in general health and fitness, simplicity and consistency are more important than complicated dosing schedules.

When Should You Take Creatine?

Creatine does not need to be taken immediately before a workout to work.

The most important factor is consistent daily use.

You can take it:

• In the morning

• With a meal

• Before exercise

• After exercise

• Mixed into a shake or beverage

Choose a routine that makes it easy to remember.

Does Creatine Damage the Kidneys?

This is probably the most common concern surrounding creatine.

Current evidence does not show that recommended creatine supplementation damages kidney function in healthy individuals. Recent systematic reviews found that creatine can cause a modest rise in serum creatinine without a corresponding significant reduction in measured or estimated kidney filtration. (PubMed)

There is an important reason for this.

Creatine can increase serum creatinine, a laboratory marker commonly used to estimate kidney function.

Therefore, someone taking creatine may have a slightly higher creatinine blood test without actually having kidney damage.

Tell your healthcare provider that you take creatine when having kidney function testing.

People with known kidney disease or other significant medical conditions should discuss supplementation with their healthcare provider before starting it.

Is Creatine Safe?

Creatine is generally considered well tolerated in healthy adults when used appropriately. NIH information notes that it appears safe for longer-term use over several years, and a large 2025 analysis of hundreds of clinical trials also evaluated its safety profile. (Office of Dietary Supplements)

Possible effects include:

• Water-weight gain

• Bloating

• Gastrointestinal discomfort

• Occasional cramping or stiffness

Taking smaller doses rather than large amounts at once may reduce gastrointestinal symptoms.

Does Creatine Cause Hair Loss?

This concern frequently circulates online.

At present, there is not strong clinical evidence demonstrating that creatine supplementation causes hair loss.

Much of the concern originated from limited research involving changes in a hormone associated with androgen activity rather than studies actually demonstrating increased hair loss.

More research would be helpful, but current evidence does not justify telling patients that creatine is a proven cause of baldness.

Does Creatine Cause Dehydration?

Creatine draws water into muscle cells, which sometimes leads people to assume it causes dehydration.

Current evidence does not support routine creatine use causing dehydration in healthy individuals when used appropriately.

Adequate hydration remains important, particularly during exercise, hot weather, or prolonged physical activity.

Who Should Talk With a Healthcare Provider Before Taking Creatine?

Medical guidance is particularly important for people who:

• Have kidney disease

• Have significant liver disease

• Are pregnant or breastfeeding

• Take medications that may affect kidney function

• Have complex chronic medical conditions

• Are adolescents considering supplementation

• Have abnormal kidney laboratory results

Supplements can also vary significantly in quality, so choosing reputable products with independent third-party testing is important.

Creatine Is Not a Substitute for the Basics

No supplement can replace the fundamentals of healthy aging and physical performance.

For optimal muscle and metabolic health, focus on:

• Resistance training

• Adequate protein

• Regular cardiovascular activity

• Whole-food nutrition

• Healthy body composition

• Adequate hydration

• Quality sleep

• Stress management

• Appropriate vitamin and mineral intake

Creatine can complement these habits—but it cannot replace them.

How Emcura Can Help

At Emcura Medical Clinic, we take an evidence-based and individualized approach to supplements.

Depending on your health goals, we may evaluate:

• Muscle mass and strength

• Exercise habits

• Protein intake

• Nutrition

• Kidney function

• Metabolic health

• Medications

• Menopausal or hormonal changes

• Healthy-aging goals

• Other supplements you are taking

Our goal is not to recommend supplements simply because they are popular. We help patients determine which interventions have meaningful evidence, which are appropriate for their health, and which may be unnecessary.

The Bottom Line

Creatine is one of the most extensively studied performance supplements available. Its strongest evidence supports improvements in strength, power, and repeated high-intensity exercise performance, particularly when combined with resistance training. Creatine monohydrate is the most studied form, and 3–5 grams daily is a commonly used maintenance dose. (Office of Dietary Supplements)

Creatine is also being investigated for healthy aging, muscle preservation, and cognitive health. These areas are promising, but the evidence—particularly for brain health—is still evolving.

For healthy adults, creatine is generally well tolerated. Patients with kidney disease or significant medical conditions should discuss supplementation with a healthcare professional before beginning it.

At Emcura Medical Clinic, we help patients separate supplement trends from scientific evidence and develop personalized strategies for stronger muscles, healthier aging, and long-term wellness.

References

1. National Institutes of Health, Office of Dietary Supplements. Dietary Supplements for Exercise and Athletic Performance: Creatine. (Office of Dietary Supplements)

2. Xu C, Bi S, Zhang W, Luo L. The Effects of Creatine Supplementation on Cognitive Function in Adults: A Systematic Review and Meta-Analysis. Frontiers in Nutrition. 2024. (PubMed)

3. Naeini EK, et al. Effect of Creatine Supplementation on Kidney Function: A Systematic Review and Meta-Analysis. 2025. (PubMed)

4. Kreider RB, et al. Safety of Creatine Supplementation: Analysis of the Prevalence of Reported Side Effects in Clinical Trials and Adverse Event Reports. Journal of the International Society of Sports Nutrition. 2025. (PubMed)

5. National Institutes of Health, Office of Dietary Supplements. Dietary Supplements for Exercise and Athletic Performance.

Medical Disclaimer: This article is intended for educational purposes only and does not replace individualized medical advice. Talk with your healthcare provider before beginning a new supplement, particularly if you have kidney disease, take prescription medications, are pregnant or breastfeeding, or have other medical conditions.