Creatine for Strength Coaches: What the Evidence Says in 2026

What Creatine Actually Does

Creatine is not a hormone, stimulant, or anabolic steroid. It is a naturally occurring compound synthesised in the body from amino acids arginine, glycine, and methionine, and obtained through the diet primarily from red meat and fish. Its mechanism is well understood: creatine is stored in skeletal muscle as phosphocreatine (PCr), which acts as a rapid energy substrate for the ATP-PCr system, the energy pathway that powers maximal effort efforts lasting 1-10 seconds. Supplementing creatine increases intramuscular PCr stores, allowing faster replenishment of ATP during high-intensity exercise. The downstream effects: greater power output during repeated high-intensity efforts, improved performance on sets taken close to failure, and, when combined with resistance training, greater lean mass accrual over time. This is not theoretical. Creatine is the most extensively researched ergogenic supplement in sports science history, with hundreds of controlled trials across multiple populations.

What the Latest Research Confirms

A 2025 systematic review and meta-analysis (Nutrients, Kazeminasab et al.) assessed creatine supplementation effects on upper and lower body strength and power across multiple populations. The findings confirmed significant improvements in bench press and leg press strength compared to placebo when creatine was combined with resistance training. A separate 2025 meta-analysis (PeerJ) examined dose-response relationships and population-specific effects, finding consistent strength benefits across trained and untrained individuals, though the magnitude of effect varied. A December 2025 systematic review and meta-analysis specifically examining creatine combined with resistance training in older adults (European Review of Aging and Physical Activity) confirmed meaningful improvements in muscular strength and lean tissue mass: particularly relevant for coaches working with older client populations. The consistent picture across the most recent evidence: creatine plus resistance training outperforms resistance training alone for strength, power, and lean mass outcomes in most populations studied.

Dosing: Loading vs Maintenance

The standard loading protocol of 20g per day split into four doses for 5-7 days, followed by a maintenance dose of 3-5g per day, was developed to saturate muscle PCr stores rapidly. It works. Loading produces full saturation within a week. However, loading is not required. Taking 3-5g per day without a loading phase achieves the same saturation over approximately 28 days: it just takes longer. Most coaches and clients will find maintenance-only simpler and equally effective for long-term use. There is no strong evidence that timing matters significantly: post-workout creatine has shown slight advantages in some studies, but the difference is small and consistency matters far more than timing. Creatine monohydrate remains the best-evidenced and most cost-effective form. More expensive forms (creatine HCl, buffered creatine, creatine ethyl ester) have not shown superiority over monohydrate in well-controlled research.

Who Benefits Most

Non-responders to creatine do exist, estimated at roughly 25-30% of users in some studies, and they tend to have naturally higher baseline PCr levels, often associated with higher dietary creatine intake (i.e., those who regularly consume significant quantities of red meat). Individuals with low baseline PCr stores, including vegetarians, vegans, and those with low red meat intake, tend to respond most strongly. For strength and power athletes, creatine is most beneficial for activities involving repeated high-intensity efforts with short recovery periods: strength training sets, sprint intervals, high-intensity conditioning. Its benefit for endurance performance is minimal. The 2025 dose-response meta-analysis also found that individuals with higher training intensity (above 75% of 1RM) tended to show stronger responses, which aligns with the mechanism: PCr replenishment matters most when you are pushing close to maximal output.

Addressing the Common Concerns

Kidney health is the most frequently raised concern, and it is largely unfounded in healthy individuals at standard doses. The myth likely originates from the fact that creatine supplementation increases serum creatinine levels, a standard kidney function marker, but this is a direct byproduct of creatine metabolism, not a sign of kidney stress. Multiple long-term supplementation studies in healthy populations have found no adverse kidney effects. The exception: individuals with pre-existing kidney disease should consult a physician before supplementing. Water retention: creatine does cause intramuscular water retention, which explains the initial body weight increase (typically 1-2kg) seen when starting supplementation. This is intracellular, water stored within muscle cells alongside the additional phosphocreatine, not subcutaneous bloating. It does not negatively affect body composition and may contribute to the cell volumisation that supports anabolic signalling. Hair loss: the one genuinely uncertain area involves a single study (van der Merwe et al., 2009) that found increased DHT levels with creatine supplementation in rugby players. DHT is associated with androgenic hair loss in genetically susceptible individuals. This study has not been replicated and the evidence is not strong enough to draw firm conclusions, but it is worth mentioning honestly to clients with a family history of hair loss.

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