Creatine has a reputation for being a supplement reserved for bodybuilders and serious athletes. But it is actually one of the most extensively studied compounds in sports nutrition and increasingly, in healthy ageing.

The interesting part? Your body already makes it.

So why do millions of people supplement it?

The answer has less to do with deficiency and more to do with how much creatine your body stores.

What is creatine?

Creatine is a naturally occurring compound made from three amino acids: arginine, glycine and methionine.

Your body produces roughly 1–2 grams per day, primarily in the liver and kidneys, and you also obtain some from foods such as meat and fish.

Around 95% of the body's creatine is stored in skeletal muscle, with smaller amounts found in tissues including the brain and heart.

Its main role is closely connected to energy.

Your cells constantly use a molecule called ATP as their immediate energy source. When energy demand suddenly rises—during a heavy lift, sprint or other intense effort—creatine helps rapidly regenerate ATP.

It doesn't create energy.

It helps your body regenerate its fastest energy currency when you need it.

If your body makes it, why supplement it?

Because supplementation isn't necessarily about correcting a deficiency.

It's about increasing your creatine stores.

Muscle creatine stores are naturally limited, and supplementation with creatine monohydrate can increase total muscle creatine by roughly 10–30%, depending on factors such as baseline levels, diet and individual response.

People who eat little or no meat and fish, for example, tend to have lower baseline muscle creatine stores and may experience a larger increase from supplementation.

Think of it less like fixing an empty tank and more like filling your existing reserve.

Think of it like a battery

Imagine your phone can hold 100% charge.

It still works perfectly at 80%.

But when you suddenly need more power, having a larger reserve can make a difference.

Creatine works somewhat like this.

Supplementation increases the amount of creatine available in muscle, giving the phosphocreatine system a larger reserve to draw from during short periods of high energy demand.

That's one reason the evidence for creatine is particularly strong when combined with resistance or high-intensity exercise.

What does the science actually support?

This is where creatine stands out.

Among supplements, creatine is one of the best-supported for improving strength, power and high-intensity exercise performance.

When combined with resistance training, regular creatine supplementation can also increase gains in lean body mass.

And unlike many supplements marketed for performance, these effects have been demonstrated repeatedly across controlled human trials and systematic reviews.

So yes, creatine can be useful for athletes.

But you don't have to be one.

Why is creatine becoming interesting after 40?

Ageing naturally brings changes in muscle mass, strength and physical function.

From midlife onward, maintaining muscle becomes increasingly important—not simply for appearance or athletic performance, but for everyday function and long-term physical independence.

This is one reason creatine has become part of the conversation around healthy ageing.

Research suggests that combining creatine supplementation with resistance training can help older adults improve strength and increase lean mass.

Creatine isn't a solution to ageing.

But maintaining muscle and physical capacity is an important part of ageing well—and creatine can be one tool within that bigger picture.

But what about the brain?

This is where the research gets particularly interesting.

The brain has a high and continuous energy demand, and it also uses the creatine-phosphocreatine system to help maintain cellular energy balance.

Researchers are investigating whether creatine supplementation can support aspects of cognitive function, particularly when the brain is under increased energetic stress.

Some studies suggest potential benefits for memory and cognitive performance, with effects appearing more pronounced in certain situations or populations—for example, during sleep deprivation or in people with lower dietary creatine intake.

But the evidence here is not as established as it is for exercise performance.

That's an important distinction.

The brain research is promising.

The muscle and performance research is much stronger.

Which creatine should you buy?

Despite the huge number of creatine products on the market, one form dominates the scientific literature:

Creatine monohydrate

It's:

Well studied.
Effective.
Widely available.
Usually inexpensive.

Other forms of creatine are marketed as being more advanced, more soluble or better absorbed.

But so far, there is no compelling evidence that you need a more exotic form to get the established benefits of creatine.

Simple doesn't mean inferior.

Sometimes it means we've already found what works.

Do you actually need it?

Not necessarily.

If you eat a varied diet, your body naturally produces creatine and you can also obtain it from food.

Creatine supplementation is best thought of as an optional performance and muscle-support tool, rather than a nutrient that everyone needs.

The potential value is particularly relevant if you:

• Do resistance or high-intensity training
• Want to increase strength or lean mass
• Eat little or no meat or fish
• Are interested in maintaining muscle as you age

And like any supplement, context matters.

Creatine is generally considered safe at commonly studied doses in healthy adults, but people with kidney disease or other relevant medical conditions should discuss supplementation with a healthcare professional.

The Auralenti take

Creatine isn't interesting because it's trendy.

It's interesting because the evidence behind it is unusually strong.

Your body already makes it. You don't need to be deficient to potentially benefit from supplementation.

For exercise, strength and maintaining muscle, the case is well established.

For cognitive health and healthy ageing, the science is evolving—and that's exactly where we should remain curious without getting ahead of the evidence.

You don't need every supplement.

But when something has decades of research behind it, it's worth understanding.

BEGIN WITHIN. 🐢