EU regulatory note: The only permissible health claim is: “Creatine increases physical performance during successive bursts of short-term, high-intensity exercise” (3 g/day, adults only, in the context of the stated exercise type). All other statements are editorial summaries of the research and are not health claims within the meaning of Regulation (EC) No 1924/2006.
What Is Creatine?
Creatine is a naturally occurring compound made from the amino acids arginine, glycine, and methionine. The body produces ~1–2 g/day; a further 1–2 g come from meat and fish in an omnivore diet. Vegetarians and vegans have on average 20–30% lower muscle creatine levels — which explains why they tend to benefit more from supplementation.
In the body, creatine is phosphorylated to phosphocreatine. Phosphocreatine serves as a rapidly available energy buffer: it regenerates ATP in muscle and brain within seconds — critical during short, explosive efforts like sprints, weightlifting, or HIIT.
Why Is Creatine So Well Studied?
Creatine has been intensively researched since the early 1990s. Over 500 controlled studies exist; the evidence base is exceptionally consistent for a supplement. This is why EFSA approved a health claim — one of the very few approved for a supplement ingredient in the EU.
What the Studies Actually Show
Clearly established: strength and performance
- Muscle strength: Meta-analyses (100+ RCTs) consistently show +5–15% strength gains vs. placebo in combination with resistance training. One meta-analysis (Lanhers 2017) reports ~8% improvement.
- Repeated high-intensity performance: Sprints, high-intensity intervals — this is where the evidence is strongest, directly explained by the phosphocreatine mechanism.
- Lean mass: Creatine + resistance training leads to significantly more lean body mass vs. training alone over multi-week protocols. Partly from intramuscular water retention, partly from enhanced protein synthesis.
Older adults: particularly relevant
The meta-analysis by Chilibeck et al. (2017, 22 RCTs) showed that older adults with creatine + resistance training gained an average of +1.37 kg more lean mass than with training alone. Given sarcopenia (age-related muscle loss), this is clinically meaningful. This data does not support an EFSA health claim, but is well established.
Cognition: well studied, but without a health claim
Multiple RCTs and systematic reviews show cognitive improvements during sleep deprivation, mental fatigue, and in people with low baseline levels (vegetarians). Vegetarians benefit consistently more — pointing to baseline levels as a moderating factor. These effects are scientifically interesting but carry no health-claim status under EU regulation.
Early phase / hypotheses
- Pilot studies in neurological conditions (Parkinson’s, Huntington’s): effects in animal models were compelling, human studies so far disappointing
- Healthy ageing and longevity: mechanistic plausibility (mitochondrial energetics, oxidative stress), no long-term human data
Regulatory Status
EFSA has approved one claim: “Creatine increases physical performance during successive bursts of short-term, high-intensity exercise” (Reg. EU 432/2012, Annex). Requirements: 3 g creatine monohydrate daily, adults only, in the context of the stated exercise type. Other statements — even if backed by studies — may not be used as health claims in advertising.
Which Form and Dose?
Creatine monohydrate is the most evidence-backed and most affordable form. Other forms (Kre-Alkalyn, creatine HCl, creatine ethyl ester) have not shown convincing advantages in direct comparisons despite marketing claims.
Practical protocols:
- For the approved claim: 3 g/day creatine monohydrate, continuously, in the context of successive short-duration, high-intensity exercise
- Without loading: 3–5 g/day continuously — reaches muscle saturation in ~4 weeks; the most commonly used protocol in studies
- With loading: 20 g/day (4 × 5 g) for 5–7 days, then 3–5 g/day — accelerates muscle depot saturation, not required regulatorily, associated with more gastrointestinal discomfort
- Timing: Taking with a carbohydrate- or protein-containing meal may slightly improve uptake; plays a minor role with daily supplementation
- Stability: Creatine monohydrate is relatively stable; degradation to creatinine may be accelerated by high heat and moisture
Is Creatine Safe?
Creatine is considered very well studied and well tolerated at usual doses in healthy adults. Long-term studies (up to 5 years) show no renal toxicity in people without pre-existing conditions — a persistent myth refuted in the scientific literature. The kidneys filter creatine efficiently; creatinine levels in blood may rise, which can cause false interpretations on lab tests (not a sign of kidney damage).
Caution advised with:
- Pre-existing kidney disease (preventive medical consultation recommended)
- Pregnancy and breastfeeding (insufficiently studied)
- Long-term medication excreted renally
Most common observation: mild intramuscular water retention (a desired training effect, not pathological oedema).
Honest Limitations
- Creatine does not work equally well for everyone: ~20–30% of individuals barely respond (“non-responders”), probably because their muscles are already saturated
- Effects without accompanying resistance training are substantially smaller for most outcomes
- Cognitive effects are primarily established in stress-exposed or sleep-deprived individuals and vegetarians — not suitable as an everyday stimulant
- No evidence of lifespan extension in humans