Substrate ·evidence-based
interventions / Creatine / energy / fatigue

Does Creatine help energy / fatigue? (Grade C evidence)

Grade C for Creatine on energy / fatigue: weak but non-null signal, low certainty; do not expect a large effect, especially in adults. Studied dose 3–5 g/day.

Exact question reviewed

Population
adults
Intervention
Creatine · 3–5 g/day
Comparator
not reported
Outcome
energy / fatigue
Time horizon
not reported

Bottom line. Grade C for Creatine on energy / fatigue: weak but non-null signal, low certainty; do not expect a large effect, especially in adults. Studied dose 3–5 g/day. [1 RCT]

Direction
benefit
Magnitude
may reduce mental fatigue, especially under sleep deprivation or stress
Grade
C
Certainty
low
Clinical meaning
small but potentially useful
Who it applies to
adults
Dose / form studied
3–5 g/day
Safety
not assessed
The one limitation
Claim-specific limitation details are not available in this public record.

Reviewed · Evidence last changed · Claim clm_ec_b1-creatine-energy v0

Grade
C
what does the grade mean?
Certainty
low
what does certainty mean?

Grade C / low: hints of benefit in small trials; a well-run RCT could easily push this to B or to null.

Who it works for

Best-studied in adults. Recorded studied dose: 3–5 g/day.

Evidence

StudyDesignRoleCite
Use of creatine in the elderly and evidence for effects on cognitive function in young and oldpeer-reviewednot classifiedPMID:21394604

Why this grade

Reasoning trace

The current record stores Grade C at low certainty and links 1 publishable source. A claim-specific domain-by-domain grading rationale is not available in this public record, so no reason for upgrading or downgrading is inferred here.

Audit and version

Claim ID
ec_b1-creatine-energy
Claim version
not reported
Governance
legacy, not verified
Last evidence search
not reported
Last editorial review
2026-07-16T04:32:22.269Z

Public receipt · Machine-readable claim · Methodology

Dose & form

Studied intake: 3–5 g/day.

How it stacks up for energy / fatigue

Grade history

Re-review cadence: every 6 months (Grade C+) · next scheduled by · methodology v1.

Frequently asked

How long does Creatine take to work for energy / fatigue?

Trials of Creatine for energy / fatigue typically report effects within 2–4 weeks, though individual response varies. Studies rarely find benefit inside 1 week for chronic outcomes.

What dose was used in studies of Creatine for energy / fatigue?

Studied doses for Creatine in energy / fatigue trials cluster around 3–5 g/day. See the dose block for the specific range and how it varies by form.

Does Creatine work for energy / fatigue if I'm not deficient?

The effect concentrates in adults. If your baseline is normal, expect a smaller effect than the trial averages.

Creatine or the next-best alternative for energy / fatigue?

See the compare block above for the head-to-head with the most-cited alternative. Grade + certainty differences matter more than any single trial.

Related

What this is — and is not

Evidence description
may reduce mental fatigue, especially under sleep deprivation or stress
Substrate's interpretation
The current reviewed record assigns Grade C at low certainty. A domain-by-domain rationale is shown only when recorded.
Discuss with a clinician
If you're on medication or have a condition that changes the calculus, bring the interaction & population blocks above to your pharmacist or prescriber before deciding.
Individualized medical advice
Not provided here or on any Substrate surface (API, agent tool, embed) — see YMYL policy.

Cite this page

Citation is encouraged. The proposed reuse license is CC-BY-4.0; status: pending-governance-ratification.

Plain-text citation
Substrate. Does Creatine help energy / fatigue? (Grade C). https://evidencebased.info/interventions/creatine/energy. Updated 2026-07-16.
BibTeX
@misc{substrate_ntionscreatineenergy,
  author = {Substrate editorial},
  title  = {Does Creatine help energy / fatigue?},
  year   = {2026},
  url    = {https://evidencebased.info/interventions/creatine/energy},
  note   = {Grade C, evidencebased.info}
}

Found something wrong on this page? Report an error →