Creatine: More Than a Fitness Powder
Energy & Cell Health · approx. 9 min. reading time
Creatine is still considered by many to be a pure strength training powder. That's too narrow a view: Creatine is primarily a cellular energy store – and this is used not only by muscles but by every tissue with high, fluctuating energy demands. This explains why recent research goes far beyond repetitions in the gym.
What Creatine Really Does in the Body
Creatine is stored as creatine phosphate and acts as a quick buffer that supplies additional ATP – the "energy currency" of every cell – when energy demand is high. Skeletal muscle is the tissue with the best-known need of this kind, but not the only one: The brain also has a high, fluctuating energy demand and has its own creatine stores. The body produces creatine itself from the amino acids arginine, glycine, and methionine and also absorbs a small amount from meat and fish – those who eat little or no animal products start with lower stores.
For Strength and Movement – For Everyone, Not Just Competitive Athletes
The longest and best-documented benefit remains physical performance during short, intense efforts: more repetitions at the same intensity before muscle fatigue. This applies to people in the gym as well as competitive athletes – the effect is not tied to a performance level but to the type of exertion (short, intense, repeated).
For Muscle and Strength Maintenance in Old Age
From about the mid-30s, muscle mass slowly but steadily decreases – a normal aging process that accelerates after the age of 60. Several systematic reviews and meta-analyses in recent years have examined creatine in combination with strength training specifically in older adults and found positive effects on muscle strength and lean body mass compared to strength training alone (European Review of Aging and Physical Activity, 2025; Journal of the International Society of Sports Nutrition, 2025). Another review explicitly summarizes this benefit under the aspect of maintaining muscle strength and mobility in old age (ScienceDirect). These studies consistently emphasize: The effect is seen in combination with strength training, not through intake alone.
For Women: A Separate, Growing Field of Research
Much of the classic creatine research was originally conducted predominantly on male athletes. A 2025 review in the Journal of the International Society of Sports Nutrition compiles the research specifically for women – from menstrual cycle-related fluctuations in endogenous creatine synthesis to on average lower baseline stores (due to generally lower muscle mass and on average lower meat consumption) to menopause, where the decline in estrogen accelerates muscle and strength loss (Journal of the International Society of Sports Nutrition, 2025). For the perimenopausal period, the research summarized there suggests that creatine in combination with strength training can mitigate age-related strength and muscle loss – here too, it applies: as a supplement to training, not a replacement.
Important for pregnant and breastfeeding women: The data on creatine during pregnancy and lactation is still new and insufficient to derive a general recommendation. Pregnant or breastfeeding women should clarify any supplementation – even seemingly harmless ones – with their treating gynecologist beforehand.
For Vegetarians, Vegans – and the Mind
Those who follow a vegetarian or vegan diet generally have lower endogenous creatine stores, as the main dietary source is absent. A frequently cited study found an improvement in certain cognitive test performances in vegetarians after creatine supplementation, especially in tasks with high demands – an effect that was significantly smaller or absent in people with already higher stores (due to regular meat consumption). A newer randomized controlled study in BMC Medicine (2023) investigated this more systematically and also found evidence of a cognitive effect, albeit with limitations in generalizability (BMC Medicine, 2023).
For context: The body of evidence on creatine and cognitive performance is inconsistent overall. A systematic review even explicitly questioned the theoretical basis for a general cognitive effect (ScienceDirect), and the EFSA rejected a corresponding health claim in 2024 due to insufficient evidence for the general population (EFSA Journal, 2024). The most consistently replicated effect does not concern "more brainpower for everyone," but specifically people with lower baseline stores – most notably vegetarians, vegans, and people experiencing sleep deprivation or mental exhaustion. An exciting but not yet definitively resolved field of research.
Timing: Before or After Training?
The difference between "before" and "after" is surprisingly small in studies. What really matters:
- Consistency beats timing. Since creatine builds up in the muscle over weeks, daily intake – regardless of the time of day – is much more important than the exact timing.
- Take it even on rest days. The store is continuously replenished, not just on training days.
Loading Phase: Necessary or Not?
Traditionally, a loading phase with 20g over 5–7 days is recommended, followed by 3–5g daily for maintenance. If you're not in a hurry, a consistent daily dose of 3–5g over about three to four weeks achieves the same saturated store – just slower and without the short-term water retention that a loading phase can bring.
How to Take It Best
- With plenty of water – creatine osmotically draws water into muscle cells; adequate hydration is part of how it works.
- Together with carbohydrates or protein can slightly improve absorption into the muscle.
- Warm water dissolves creatine monohydrate noticeably better than cold water.
The Most Persistent Myth
The concern that creatine would permanently cause "bloating" almost always refers to intramuscular water retention during an aggressive loading phase – not visible water retention under the skin. With a moderate, consistent daily dose, this effect is hardly noticeable in practice.
Good to Know
Adequate hydration is an essential part of effective creatine intake, not just a side recommendation. In cases of existing kidney disease, pregnancy, and lactation, intake should be discussed with a doctor beforehand.
Also relevant
medi Creatin provides 5g of creatine monohydrate per scoop – simply dissolved in water, as described in the text.
Sources
- Creatine in women's health: bridging the gap from menstruation through pregnancy to menopause. Journal of the International Society of Sports Nutrition (2025). tandfonline.com · PubMed 40371844
- The impact of creatine supplementation associated with resistance training on muscular strength and lean tissue mass in the aged: systematic review & meta-analysis. European Review of Aging and Physical Activity (2025). Springer
- Creatine monohydrate supplementation for older adults and clinical populations. Journal of the International Society of Sports Nutrition (2025). tandfonline.com
- Creatine supplementation for older adults: Focus on sarcopenia, osteoporosis, frailty and cachexia. ScienceDirect
- The effects of creatine supplementation on cognitive performance – a randomised controlled study. BMC Medicine (2023). Springer
- Creatine supplementation research fails to support the theoretical basis for an effect on cognition. Neuroscience & Biobehavioral Reviews. ScienceDirect
- EFSA NDA Panel (2024). Creatine and improvement in cognitive function: Evaluation of a health claim pursuant to Article 13(5). EFSA Journal. Wiley
This article is for general information and does not replace individual medical or sports science advice.
