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The 4V Journal

Performance

Creatine: What the Human Research Supports

A research-grounded reading of creatine’s established human evidence, including the contexts that still deserve care.

Published
August 24, 2026
Last reviewed
August 22, 2026
Evidence context
Established human evidence for oral creatine, especially creatine monohydrate alongside resistance training. Evidence for cognition remains less mature.

Research snapshot

Meta-analyses of randomized trials show that creatine, especially when paired with resistance training, can add to strength gains. The clearest evidence is for high-intensity performance and training adaptation. Creatine complements the training stimulus rather than replacing it.

Creatine combined with resistance training increases lean body mass more than resistance training alone on average. Some early change can reflect increased water inside muscle, but longer-term trials also support greater training adaptation. Lean body mass is not identical to pure contractile muscle, so the measurement deserves context.

What the human evidence can and cannot say

Current pooled human evidence does not show a meaningful decline in kidney filtration from standard creatine supplementation in generally healthy study populations. Creatine can raise blood creatinine, which may make creatinine-based kidney estimates look worse even when more direct filtration measurements do not show the same change. That distinction is why a creatinine rise alone is not proof of kidney injury.

Creatine monohydrate has one of the larger human safety databases among sports supplements and has generally been well tolerated in studied populations. Across hundreds of clinical trials, overall reported side-effect frequency has been similar to placebo. That is population-level evidence, not a guarantee for every individual medical situation.

Healthy aging and open questions

In older adults, creatine added to resistance training can improve some measures of lower-body strength and lean tissue beyond training alone. The effect is not identical across every outcome or study. The strongest healthy-aging case is as an adjunct to resistance training, not a substitute for it.

Creatine may have cognitive benefits, particularly for memory, but this evidence is less mature than the strength and performance literature. A 2024 meta-analysis reported encouraging signals, but it also received a correction and later methodological criticism, so 4V keeps the confidence more modest here.

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