A Nutritionist’s Guide to Creatine: Energy, Strength, Brain Support

If you’re thinking, isn’t creatine for gym bros? You’re not wrong. But they don’t get to hog all the benefits. Creatine is one of the most researched supplements globally, with decades of data behind it. While it’s best known for supporting strength, power and muscle growth, its role in the body goes far beyond the gym. Creatine supports how every cell in your body produces and recycles energy, which is what makes it so effective for short bursts of physical effort, but also highly relevant for everyday life.

Your brain is the most energy-hungry organ in the body. It’s constantly firing neurones, maintaining concentration, regulating mood and processing information. Creatine helps provide readily available energy for these high-demand systems, which is why it’s increasingly being studied for its role in cognitive performance, mental resilience and brain health. So while creatine can absolutely help you lift heavier or train harder, its benefits extend to anyone looking to support physical capacity, mental sharpness and long-term energy — gym membership optional.

 

What is Creatine?

 

Creatine is a naturally occurring compound found throughout the body, primarily inside the cells of our muscles, brain and nervous system. Its main role is to support rapid energy production, particularly in situations where energy demand is high and oxygen availability is limited. This includes short, intense bursts of activity such as sprinting, weight lifting or climbing stairs, but also processes like firing neurones, maintaining concentration and responding to stress. In these moments, creatine acts as a rapid energy reserve, helping cells keep up with demand.

We can get creatine from animal foods such as red meat and fish, and the body can also synthesise its own creatine from amino acids in the diet. However, dietary intake is often relatively low, and the body’s own production doesn’t always keep pace with modern energy demands. This is where supplementation comes into play, providing a consistent, readily available source to support both physical and cognitive energy systems.

 

What Does Creatine Do in the Body?

At a cellular level, creatine supports the production and recycling of ATP (adenosine triphosphate), the body’s main energy currency. You can think of ATP as the unit of energy every cell in your body uses to do work. When ATP is broken down to release energy, creatine helps regenerate it rapidly, allowing cells to keep functioning efficiently rather than running out of fuel. This is especially important in tissues with high or fluctuating energy demands, such as skeletal muscle and the brain. Muscles rely on creatine to sustain short bursts of power and repeated efforts, while neurones depend on a stable energy supply to support signalling, focus and resilience under load. When demands are high, whether physical or mental, having enough creatine can help make cellular energy more readily available, supporting performance when it matters most.

 

Who Is Creatine For?

Creatine is for anyone looking to support physical or mental performance, particularly when energy demands are high or recovery capacity is stretched.

Active individuals

Whether you strength train, run, cycle or do high-intensity classes, creatine can support power output, endurance and training consistency by helping muscles perform and recover more effectively. By helping you squeeze a bit more out of your training sessions, research indicates that creatine can support greater gains in strength and muscle growth.

Busy professionals & mental performance

High cognitive load, long workdays, screen time and decision fatigue all increase the brain’s energy requirements. Research suggests that creatine may improve short term memory and intelligence/reasoning, with effects on cognition appearing particularly relevant when we’re under-slept (which, let’s face it, most of us are at times). In fact, one controlled study found that creatine supplementation significantly helped offset declines in mood and cognitive performance during sleep deprivation.

Women

Creatine is often underused by women due to concerns about bulk or water retention. In reality, creatine is highly relevant for women, supporting strength, recovery and brain energy without altering body composition in an unwanted way when used appropriately. Creatine does draw water into the muscle cell, which can make the muscles themselves appear very slightly fuller. However, it doesn’t increase water retention elsewhere in the body, and it doesn’t lead to muscle gain unless it’s paired with a targeted training programme and adequate nutritional support.

Ageing populations

As we age, our ability to efficiently produce and recycle cellular energy (ATP) declines, alongside well-documented changes in mitochondrial function. At the same time, the digestive system often becomes less efficient at breaking down and absorbing key nutrients, which can further limit the body’s capacity to meet energy demands. In this context, creatine supplementation may be particularly useful, with research showing benefits for muscle strength, physical function and the maintenance of independence later in life. There is also growing interest in creatine’s potential role in supporting brain function with ageing and alongside neurodegenerative conditions such as Alzheimer’s and Parkinson’s diseases, making it an increasingly relevant consideration beyond physical performance alone.

 

What Does Creatine Support?

Strength and power output

• Muscular endurance
• Training capacity and consistency
• Recovery between sets

Brain energy and cognitive resilience

• Short term memory and reasoning
• Healthy ageing

Why You Should Care About Creatine (Even If You Don’t Train)

The demands on our energy are arguably greater now than they ever have been. Modern life places a constant cognitive load on the nervous system — competitive work environments, family responsibilities, social commitments, chronic screen exposure and ongoing mental stimulation. At the same time, age-related declines in ATP production mean that our baseline energy capacity gradually reduces over time. This can show up as poorer recovery, reduced physical resilience and mental fatigue long before anything is clinically “wrong”. From a preventative perspective, creatine offers a way to support foundational energy systems before problems arise.

Another piece that is often overlooked is that when energy availability is low, the nervous system has less margin for error. Everyday stressors can feel bigger, recovery slower and mental load harder to carry. Supporting cellular energy doesn’t remove stress from life, but it can increase the system’s capacity to meet it. From that perspective, creatine becomes as much about performance as about resilience — helping both body and brain cope more comfortably with modern demands.

 

What to look for in a creatine supplement

Not all creatine supplements are created equal. Key things to consider include:

• Creatine monohydrate: This is the gold-standard, most researched and evidence-backed form.
  
• Purity and testing: Always look for products that are third-party tested, and avoid any with artificial fillers, flavours, sweeteners or other unnecessary ingredients.
• Dosage: Dosage can be a personal choice, with 5g per day considered standard. Dosages from 3g per day can be beneficial, while some studies use 15g+ per day for targeted cognitive benefits. For that reason, I like a powdered supplement that I can dose myself, rather than capsules which can be trickier to manage.
  
• Taste and mixability: Creatine monohydrate is practically tasteless and can be added to anything. Micronised creatine dissolves best, as it’s broken down into even smaller particles for better mixability.

The Long-Term Benefits of Creatine

Creatine has an excellent safety profile when used appropriately, with long-term research supporting its use across a wide range of populations. While some studies show immediate effects, for example on cognition while sleep deprived, most benefits of creatine come with consistency. Daily use for 3–4 weeks or longer tends to matter more than aggressive loading protocols, which are unnecessary for most people. The evidence supports sustained improvements in strength, power and muscle mass, alongside better overall physical function, while research into long-term cognitive benefits is still emerging.

Concerns about kidney health are common but largely rooted in misunderstanding. In healthy individuals, creatine has not been shown to impair kidney function when used at recommended doses. Although, as always, those with pre-existing medical conditions should seek personalised guidance.

Creatine FAQs

Is creatine safe long term?
Yes, creatine is one of the most well-studied supplements available, with strong long-term safety data in healthy populations.

Can women take creatine?
Absolutely. Women benefit from creatine in the same way men do, particularly for strength, recovery and brain energy.

Do you need to load creatine?
No. Loading is optional and not necessary for most people. Daily consistent dosing is sufficient.

Does creatine cause water retention?
Creatine increases water content inside muscle cells, not subcutaneous water retention. This supports performance and tone rather than causing puffiness.

Can creatine help brain function?
Emerging research suggests creatine may support aspects of cognitive performance and brain energy metabolism, particularly under stress or sleep deprivation.

References:

Avgerinos, Konstantinos I et al. “Effects of creatine supplementation on cognitive function of healthy individuals: A systematic review of randomized controlled trials.” Experimental gerontology vol. 108 (2018): 166-173. doi:10.1016/j.exger.2018.04.013

Burke, Ryan et al. “The Effects of Creatine Supplementation Combined with Resistance Training on Regional Measures of Muscle Hypertrophy: A Systematic Review with Meta-Analysis.” Nutrients vol. 15,9 2116. 28 Apr. 2023, doi:10.3390/nu15092116

Devries, Michaela C, and Stuart M Phillips. “Creatine supplementation during resistance training in older adults-a meta-analysis.” Medicine and science in sports and exercise vol. 46,6 (2014): 1194-203. doi:10.1249/MSS.0000000000000220

Lugaresi, Rebeca et al. “Does long-term creatine supplementation impair kidney function in resistance-trained individuals consuming a high-protein diet?.” Journal of the International Society of Sports Nutrition vol. 10,1 26. 16 May. 2013, doi:10.1186/1550-2783-10-26

McMorris, T et al. “Creatine supplementation, sleep deprivation, cortisol, melatonin and behavior.” Physiology & behavior vol. 90,1 (2007): 21-8. doi:10.1016/j.physbeh.2006.08.024

McMorris, T et al. “Effect of creatine supplementation and sleep deprivation, with mild exercise, on cognitive and psychomotor performance, mood state, and plasma concentrations of catecholamines and cortisol.” Psychopharmacology vol. 185,1 (2006): 93-103. doi:10.1007/s00213-005-0269-z

Powers, Michael E. et al. “Creatine Supplementation Increases Total Body Water Without Altering Fluid Distribution.” Journal of athletic training vol. 38,1 (2003): 44-50.

Rae, Caroline et al. “Oral creatine monohydrate supplementation improves brain performance: a double-blind, placebo-controlled, cross-over trial.” Proceedings. Biological sciences vol. 270,1529 (2003): 2147-50. doi:10.1098/rspb.2003.2492

Wang, Ziyu et al. “Effects of Creatine Supplementation and Resistance Training on Muscle Strength Gains in Adults <50 Years of Age: A Systematic Review and Meta-Analysis.” Nutrients vol. 16,21 3665. 28 Oct. 2024, doi:10.3390/nu16213665

Wu, Shih-Hao et al. “Creatine Supplementation for Muscle Growth: A Scoping Review of Randomized Clinical Trials from 2012 to 2021.” Nutrients vol. 14,6 1255. 16 Mar. 2022, doi:10.3390/nu14061255