Creatine: For Greater Physical and Mental Performance

^{Laura Chrobok  08.12.2025}

Although many people still consider creatine a “supplement for athletes,” this view is now outdated. In modern longevity research, creatine is gaining increasing attention because it influences cellular energy processes, muscle function, cognitive performance, and even the brain’s stress resilience. Creatine is therefore not just a fitness nutrient — but a highly relevant compound for anyone who wants to stay strong, clear-minded, and capable well into older age.

Get to know what role creatine plays in energy metabolism, how it affects muscle strength and brain performance, why supplementation becomes especially valuable with age, and — as you already know from our other articles — you will also find answers to many additional questions.

What Is Creatine and Why Is It So Important for Energy Metabolism?

Creatine is a naturally occurring compound that serves as a short-term energy buffer in both muscle and brain tissue. The body produces creatine on its own, but about 50% is obtained through diet — primarily from meat and fish.

Creatine enables cells to make ATP — the body’s pure energy currency — available particularly quickly. This mechanism shows clear signs of decline with age.

As we get older, intracellular creatine stores decrease — especially in muscle, but also in the brain. This contributes to:

·       early fatigue

·       loss of muscle mass

·       reduced mental resilience/performance.

Creatine is therefore important for two central longevity aspects: physical and cognitive performance.

What Creatine Can Do

·       Improving physical performance (including in older adults): Creatine is one of the few substances with solid human data in the context of aging.

The combination of creatine and resistance training can significantly increase muscle mass and strength in older adults (Devries & Phillips, 2014). This means creatine directly counteracts sarcopenia — one of the most important markers of biological aging.

·       Improving cognitive performance (including under stress): Creatine also supports the brain’s energy balance. It enhances cognitive performance under strain — such as during sleep deprivation, mental stress, or complex tasks (Avgerinos et al., 2018).

Creatine in Foods

Meat and fish are good sources. However, creatine content varies widely depending on species, feed, processing, and storage.

Creatine Supplements: Forms, Dosage, Tolerability, and More

The molecule (known since the 19th century) began attracting scientific interest as a potential dietary supplement in the 1970s. Although research accelerated only around 20 years later, creatine is now one of the most extensively studied supplements in the world.

Forms

For most applications, creatine monohydrate is used because this form is highly stable, bioavailable, and cost-effective (Persky & Brazeau, 2001). Alternative forms exist, but none have proven advantages over creatine monohydrate (Benzi, 2000).

Creatine monohydrate is available in capsule and tablet form, which may be convenient when traveling.

However, it is most commonly sold as a powder, since almost all studies use this form. Powder is also more affordable and allows more precise dosing. Regarding effectiveness, no form has an advantage as long as it is pure creatine monohydrate (Benzi, 2000).

Dosage and Use

A daily intake of 3–5 g creatine monohydrate is sufficient to gradually increase the body’s stores (Hultman et al., 1996; Harris et al., 1992). Some people use an initial loading phase, where higher amounts are taken for a few days to saturate stores more quickly. This is possible but not necessary (Hultman et al., 1996).

Creatine does not need to be taken at a specific time. Some studies show slightly better uptake when taken with a meal (Steenge et al., 2000). Other research indicates small advantages when taken around workouts (Antonio & Ciccone, 2013). Over weeks and months, however, regularity is far more important than timing.

Tolerability

Creatine monohydrate is considered well tolerated at typical doses. Studies show no negative effects on kidney or liver function in healthy individuals (Poortmans & Francaux, 1999; Persky & Brazeau, 2001). Caution is advised only in cases of known severe kidney disease or rare disorders of creatine metabolism.

Side Effects and Interactions

Side effects are usually mild, but not impossible:

o   A slight increase in body weight may occur because creatine increases water retention inside muscle cells. This is a desired intracellular hydration effect — not “water retention” under the skin (Powers et al., 2003).

o   Gastrointestinal discomfort such as nausea or diarrhea is possible but rare (Persky & Brazeau, 2001).

o   People with kidney disease, glomerular damage, or known defects in creatine metabolism should not take creatine without consulting medical professionals. Because creatine increases creatinine levels, it can make diagnostic interpretation more difficult. Medications may also increase kidney load (Poortmans & Francaux, 1999).

FAQ – Frequently Asked Questions About Creatine

1. Is creatine useful even for people who do not exercise?

Yes. Creatine plays an important role in brain metabolism — especially during mental stress, lack of sleep, or cognitive strain — regardless of physical activity. Vegetarians and vegans also benefit, as creatine is found almost exclusively in animal products.

2. Does creatine lose its effectiveness if caffeine is consumed?

This previously widespread assumption is outdated. Current evidence shows that moderate caffeine intake does not impair the effects of creatine. In fact, both substances are often combined in sports settings.

3. Are there situations in which creatine intake should be paused?

Yes, if kidney-related blood markers such as creatinine or GFR (glomerular filtration rate, which indicates how well the kidneys filter the blood) need to be evaluated for medical reasons. Since creatine affects these values, intake should ideally be paused for about a week beforehand.

4. Can creatine be taken long-term — or does the body adapt?

Although the body regulates creatine metabolism, there is no evidence that creatine loses its effectiveness with long-term use.

5. How long does it take to feel the effects?

Without a loading phase: about 2–4 weeks. With a loading phase: about 5–7 days.

Cognitive effects may occur sooner depending on individual baseline status.

Conclusion: Creatine Strengthens Both Body and Mind

We’re almost tempted to say, we saved the best for last: Creatine strengthens the energetic reserves on which both body and brain rely daily. Because creatine acts through fundamental biological mechanisms, its benefits extend far beyond sports — into everyday situations where resilience and concentration are required. Moreover, individuals with increased needs — such as older adults, vegetarians, or vegans — often benefit particularly strongly from targeted supplementation.

Creatine does not replace a healthy lifestyle — but it is a factor that can make the system stronger, more capable, and resilient!

More resilience will also be an important aspect of our next blog post. Additional information on many other topics can be found in the individual articles on our blog and in the volumes of our “Codex Humanus” and “Medizinskandale” series. For longevity, we particularly recommend the volume on aging. Feel free to visit our online shop.

Sources:

·       Devries, M. C., & Phillips, S. M. (2014): “Creatine supplementation enhances muscle mass and strength in older adults,” Medicine & Science in Sports & Exercise.

·       Avgerinos, K. I. et al. (2018): “Effect of creatine supplementation on cognitive function in adults: a systematic review of randomized controlled trials,” Experimental Gerontology.

·       Persky, A. M., & Brazeau, G. A. (2001): “Clinical pharmacology of the dietary supplement creatine monohydrate,” Pharmacological Reviews.

·       Benzi, G. (2000): “Is there a rationale for the use of creatine either as nutritional supplement or drug?,” Journal of Sports Medicine and Physical Fitness.

·       Hultman, E. et al. (1996): “Muscle creatine loading in men,” Journal of Applied Physiology.

·       Harris, R. C. et al. (1992): “Elevation of creatine in resting and exercised human muscle by creatine supplementation,” Clinical Science.

·       Steenge, G. R. et al. (2000): “Protein- and carbohydrate-induced augmentation of creatine transport in human skeletal muscle,” Journal of Applied Physiology.

·       Antonio, J., & Ciccone, V. (2013): “The effects of pre versus post workout supplementation of creatine monohydrate on body composition and strength,” Journal of the International Society of Sports Nutrition.

·       Poortmans, J. R., & Francaux, M. (1999): “Long-term oral creatine supplementation does not impair renal function in healthy athletes,” Medicine & Science in Sports & Exercise.