Creatine: What It Does, Why We Need It, and Why It Matters With Age

In this article

1. What Is Creatine and How Does It Work?
2. How Much Creatine Does Your Body Need?
3. Creatine and Physical Performance
4. Why Was Creatine Associated With Athletes?
5. Creatine for Women
6. Creatine After 50
7. Do You Need Creatine Supplements?
8. Is Creatine Safe to Take Every Day?
9. Frequently Asked Questions

Creatine is a substance naturally produced by the body and stored mainly in skeletal muscle, with smaller amounts also found in the brain and other tissues. It helps the body rapidly regenerate energy, particularly when muscles suddenly need more of it.

Although creatine is best known as a sports supplement, our bodies use it every day. Its role is also being studied in muscle health, aging, women’s health, and brain energy metabolism.

What Is Creatine and How Does It Work?

Creatine helps muscles quickly restore energy, allowing us to better sustain and repeat intense physical efforts.

When we lift something heavy, run to catch a bus, quickly climb a flight of stairs, or exercise, our muscles suddenly need a large amount of energy. Through the creatine-phosphocreatine system, creatine helps rapidly regenerate ATP — the molecule cells use directly for energy.^[1]

Most of the body’s creatine is stored in skeletal muscle, which is why creatine is so closely associated with muscle energy and physical performance.^[1]

But creatine’s role is not limited to muscle. The creatine-phosphocreatine system also contributes to brain energy metabolism, and researchers are increasingly studying whether creatine supplementation may affect cognitive performance when the brain is under greater energetic stress.

For example, a 2024 study found changes in brain energy metabolism and improvements in some measures of cognitive performance after a high dose of creatine during sleep deprivation.^[2]

These findings are interesting, but they do not mean that everyday stress, office work, or mental effort automatically increases a person’s creatine requirement. The study also does not establish that creatine should routinely be used to compensate for insufficient sleep.

Creatine Has Been Known for Almost 200 Years

Creatine was first isolated from meat by French chemist Michel Eugène Chevreul in 1832. The later discovery of phosphocreatine in 1927 helped researchers understand how creatine contributes to rapid energy production in muscle.^[3]

How Much Creatine Does Your Body Need?

The body produces creatine from three amino acids — arginine, glycine, and methionine — while additional creatine can come from food, particularly meat and fish.^[1]

There is currently no officially established recommended daily intake for creatine, comparable to the daily recommendations established for many vitamins and minerals.

An adult body produces approximately 1 gram of creatine per day, but this should not be interpreted as the amount of creatine a person needs to consume each day.

Creatine is stored primarily in muscle, where the body maintains a much larger reserve. An adult weighing around 70 kg (154 lb) may have approximately 120 g of creatine and phosphocreatine in the body.^[1]

A small portion of the body’s creatine and phosphocreatine is naturally converted into creatinine and eliminated through the kidneys. This loss must continually be replaced through the body’s own production and dietary intake.

The 3–5 g per day commonly associated with creatine supplements should therefore not be interpreted as the amount every person must consume each day. Instead, this range is commonly studied and used as a maintenance dose to increase or maintain creatine stores.^[1]

What Foods Contain the Most Creatine?

Dietary creatine comes primarily from animal tissue, making meat and fish the main natural food sources.^[1][4]

Reported food-composition values show that herring may provide approximately 650–1,000 mg of creatine per 100 g, while salmon provides around 450 mg, tuna around 400 mg, and cod around 300 mg. Beef and pork also contain creatine, although the amount depends on the specific cut.^[4]

Depending on the food, approximately 200–400 g of certain types of meat or fish may provide around 1 g of creatine. However, the body also produces creatine, so dietary intake should not be confused with a supplementation dose.

Obtaining 3–5 g of creatine exclusively from food would require much larger quantities of meat or fish. This does not mean that we need to obtain 3–5 g from food every day because our bodies also produce creatine.

Vegetarians tend to have lower muscle creatine concentrations than people who regularly consume meat and may sometimes show a greater response to supplementation.^[1]

Creatine and Physical Performance

Creatine is involved in both everyday activities and exercise. The difference becomes more noticeable when the body suddenly needs a large amount of energy.

During a sprint, a heavy lift, or an intense set of exercises, muscles rapidly use the energy immediately available to them. At these moments, creatine — through phosphocreatine — helps rapidly regenerate ATP, allowing muscles to better sustain and repeat intense efforts.

This is why some of the clearest benefits of creatine supplementation have been observed during short, intense, repeated physical efforts, such as sprinting and resistance training.^[1]

This does not mean that every physically active person has a formally higher daily creatine requirement. Instead, supplementation is best supported for increasing creatine stores and improving the ability to perform repeated short, intense efforts.

It is also useful to distinguish the immediate energy demands of muscle contractions from the broader experience of feeling tired. Our guide to physical versus mental fatigue explains why different kinds of tiredness do not necessarily have the same causes.

Why Was Creatine Traditionally Associated With Athletes?

Creatine is not a biologically “male” substance. Both women’s and men’s bodies naturally produce and use creatine.

Its reputation as a supplement primarily for men developed largely because early research and marketing focused heavily on sports, bodybuilding, strength, and athletic performance.

Women were also significantly underrepresented in creatine research.

A 2020 systematic review identified 656 studies in which creatine was the primary intervention, but only 58 studies — approximately 9% — included females exclusively.^[5]

This research gap has gradually begun to narrow as scientists have started investigating creatine specifically in women and at different stages of a woman’s life.

Creatine for Women: What Does Research Say?

The change is not that scientists suddenly discovered that “creatine works for women.” Women’s bodies have always produced and used creatine. What has changed is the questions researchers are asking.

Research now examines creatine across different stages of a woman’s life, including the reproductive years, pregnancy, the postpartum period, and postmenopause.^[6]

Hormonal changes may influence aspects of creatine metabolism, which is one reason these life stages are increasingly studied separately.

Evidence supports creatine’s effects on strength and physical performance. In older and postmenopausal women, researchers are also examining its potential to support muscle mass and function, particularly when combined with resistance training.^[6]

Potential effects on cognition, mood, and bone health are also being investigated, but the evidence in these areas is less consistent.^[6]

Importantly, research interest in pregnancy and the postpartum period does not mean creatine supplementation is routinely recommended during these stages. Evidence on its safety and benefits in pregnant or breastfeeding people remains insufficient for general recommendations. Individual questions should be discussed with a qualified healthcare professional.

Creatine After 50: Muscle Strength and Aging

Creatine does not suddenly become necessary after age 50. What changes with age is the importance of preserving muscle mass, strength, and physical function.

As we age, we gradually lose muscle mass and, importantly, muscle strength. These changes can eventually affect our ability to perform everyday activities.

At 25, having more strength might mean lifting a heavier weight at the gym.

At 70, strength can mean getting out of a chair without assistance, climbing stairs, carrying groceries, and maintaining independence.

This is why research on creatine in older adults is not simply about building larger muscles. Researchers are also interested in preserving strength and physical function.

Studies in older adults suggest that combining creatine with resistance training may provide modest additional improvements in muscle strength compared with resistance training alone. However, the effects on muscle mass and physical function remain less certain.^[7]

These findings are based mainly on generally healthy older adults participating in structured resistance training. They should not automatically be applied to frail individuals or people with significant mobility limitations.

Creatine does not replace physical activity, adequate protein intake, or a balanced diet, and it cannot stop the natural process of muscle aging.

Do You Need Creatine Supplements?

There is no universal answer.

Our bodies produce creatine naturally, while people who eat meat and fish also obtain creatine through their diet. Vegetarians generally consume much less dietary creatine and tend to have lower muscle creatine concentrations.^[1]

The strongest evidence for supplementation is related to short, intense physical efforts and resistance training, while research involving older adults and other populations continues to expand.

Before deciding whether to use creatine, it helps to understand when dietary supplements may be useful and why a supplement should serve a specific purpose rather than simply being added to an everyday routine.

Which Form of Creatine Is Best Studied?

Creatine monohydrate is the most extensively studied supplemental form. It is commonly sold as a powder, although creatine supplements are available in other presentations. Our guide to supplement forms explains practical differences between powders, capsules, tablets, and liquids.

How Much Creatine Is Commonly Used in Studies?

A maintenance dose of approximately 3–5 g per day is commonly used in research and supplementation protocols.^[1]

A loading phase — often around 20 g per day divided into several smaller doses for 5–7 days — can increase muscle creatine stores more quickly, but loading is not necessary. Smaller daily doses can gradually increase muscle creatine stores over time.^[1]

These are research and supplementation protocols, not a universal recommendation for every adult.

When comparing creatine products, check whether the stated amount refers to one scoop, one capsule, or a full serving. Our explanation of supplement serving size shows why this distinction matters when interpreting the dose printed on a label.

Product labels can also contain additional ingredients, blends, and claims that are not always easy to interpret. Understanding how to read a Supplement Facts label can help you identify what the manufacturer actually declares.

Is Creatine Safe to Take Every Day?

Creatine monohydrate is the most widely used and extensively studied form of creatine. In healthy adults, it is generally considered well tolerated at commonly studied doses.^[1]

Creatine supplementation can increase body weight, particularly during the early stages of supplementation. Part of this increase may be related to greater water retention.^[1]

Some people may experience gastrointestinal discomfort, including nausea, bloating, or diarrhea, particularly when taking large amounts at once. Tolerability can vary between individuals.

Creatine and Kidney Health

Kidney health is one of the most common concerns surrounding creatine.

Creatine supplementation may cause a small increase in blood creatinine, a marker commonly used when evaluating kidney function. This can complicate the interpretation of blood tests without necessarily indicating kidney damage.

A 2025 systematic review and meta-analysis found a modest increase in serum creatinine but no significant adverse change in glomerular filtration rate (GFR) associated with creatine supplementation.^[8]

However, a change in creatinine and actual kidney damage are not the same thing. Kidney function should be evaluated using the full clinical context rather than a single laboratory result.

People with existing kidney disease, medical conditions that require kidney monitoring, or medications that may affect kidney function should discuss creatine supplementation with a qualified healthcare professional before starting it.

If you use creatine, tell your healthcare professional before kidney-related blood tests so the results can be interpreted appropriately.

Written by Victoria, founder and editor of RoutineHealth. This article is for general education and is not medical advice. Creatine supplementation may not be appropriate for everyone, particularly people with kidney disease, certain medical conditions, or those who are pregnant or breastfeeding. Consult a qualified healthcare professional when individual safety or medical monitoring is relevant. How we research and correct articles is explained in our Editorial Policy; see also our Medical Disclaimer.

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