Creatine: not a young-person's supplement — an evidence-backed candidate against sarcopenia

Human evidence: B+ (meta-analyses, consistent direction; requires concurrent resistance training) Updated: October 2026

Summary: Creatine is rarely discussed in "anti-aging" marketing, yet against age-related muscle and strength loss (sarcopenia) it has the most reproducible numbers on this site: meta-analyses of 22 RCTs in older adults show +1.37 kg lean mass and small-to-moderate strength gains when combined with resistance training. It is not something that works while you sit.

What is claimed

After 40, muscle mass and strength decline roughly 8–10% per decade, driving falls, disability, and mortality. Creatine replenishes the instantaneous energy store (phosphocreatine) in muscle, letting training be performed at higher intensity — the proposed mechanism for slowing age-related muscle loss.

What has actually been shown

1. Meta-analysis: 22 RCTs, 721 participants — more lean mass, more strength (2017)

Meta-analysis of 22 RCTs in adults aged 57–70 (721 participants; resistance training 7–52 weeks). Creatine + training vs. placebo + training:

Lean mass +1.37 kg (95% CI 0.97–1.76)
Chest-press strength SMD 0.35 (0.16–0.53)
Leg-press strength SMD 0.24 (0.05–0.43)

An updated 2025 meta-analysis confirmed significant improvements, most clearly for lower-limb strength and lean mass, with effects most visible in trials of 32 weeks or less.

2. Functional outcomes: the chair-stand test

A meta-analysis of RCTs in 357 older adults (2014) reported increased lean mass plus improved 30-second chair-stand performance. Gains in "reserve capacity for everyday movement" matter more for aging than raw strength numbers.

3. Safety

3–5 g/day oral creatine monohydrate is consistently reported as safe in healthy adults, including follow-ups up to ~5 years. People with kidney disease should check with a physician first.

Weaknesses & cautions

Training is a prerequisite. Creatine alone (no exercise) produces little to no lean-mass gain. It is not "anti-aging in a capsule."
Part of the 1–2 kg weight gain is water, not only contractile tissue.
Strength gains are modest (SMD 0.24–0.35 = small-to-moderate). The training itself does more than the creatine.
Ads claiming "longevity" or "anti-aging" from these data go well beyond what was measured.

Bottom line

"A person already doing resistance training 2–3×/week adds 3–5 g/day of creatine to slightly amplify the effect" — limited to this use, creatine is the best-evidenced anti-aging supplement we cover. Do not expect the same effect without training. Rating: B+.

Sources

Chilibeck PD et al. Effect of creatine supplementation and resistance exercise training in healthy older adults: a systematic review and meta-analysis. Appl Physiol Nutr Metab 43:1–11 (2018). PMID 29138605
Devries MC, Phillips SM. Creatine supplementation during resistance training in older adults: a meta-analysis. Med Sci Sports Exerc 46:1194–1207 (2014). PMID 24378577
Kelly LJ et al. Impact of creatine supplementation in combination with resistance training on lean mass and functional outcomes in older adults: an updated systematic review and meta-analysis. Eur Rev Aging Phys Act 22 (2025). PMC12119201

Informational content only — not medical advice. Consult a clinician if you have a medical condition or take medications.