Creatine supplementation increases the spread of tumors in mice. It does this by raising creatine levels in megakaryocytes and activating a protein called CKB, which triggers a signaling change that makes platelets overactive, promoting metastasis.
See the scientific wording
Exogenous creatine supplementation is associated with increased tumor metastasis in multiple mouse models through a platelet activation mechanism. Specifically, creatine increases megakaryocyte creatine levels and upregulates creatine kinase B (CKB), leading to non-canonical STAT5B phosphorylation that instigates platelet functional genes and hyperactive platelets.
Correlational — new studies may shift this
ObservationalOne low-scoring study links this claim to the outcome, but causation is not established.
What the research says
1 study reviewedSupporting (1)
Cross-Sectional StudyHuman2026
This study shows that giving creatine supplements to mice makes their platelets more active, which helps cancer spread faster, matching the claim exactly.
Contradicting (0)
No contradicting studies found yet
That doesn't mean it's settled — it just means no study has tested the opposite.
Quality-weighted scoring: we follow the GRADE framework — each study is rated High, Moderate, Low, or Very Low based on study design, methodology rigor, and risk of bias. A single high-quality RCT can outweigh several weaker observational studies.
Scores reflect study quality, not just count.
Taking creatine supplements increases the amount of creatine in bone marrow cells that make platelets. This boosts a protein called CKB, which then activates another protein called STAT5B. Activated STAT5B turns on genes that make platelets hyperactive. These hyperactive platelets help cancer cells spread to new places in the body.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting study
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Creatine supplementation increases the spread of tumors in mice. It does this by raising creatine levels in megakaryocytes and activating a protein called CKB, which triggers a signaling change that makes platelets overactive, promoting metastasis.
Mechanism
1 studyCreatine supplements boost a specific protein chain that makes platelets overly active, helping cancer spread. This has been proven by blocking each step in mice, which stops the effect.
Taking creatine supplements increases the amount of creatine in bone marrow cells that make platelets. This boosts a protein called CKB, which then activates another protein called STAT5B. Activated STAT5B turns on genes that make platelets hyperactive. These hyperactive platelets help cancer cells spread to new places in the body.
Exogenous creatine supplementation increases creatine levels in megakaryocytes, the precursor cells that produce platelets.
Elevated creatine upregulates the expression of creatine kinase B (CKB) in megakaryocytes.
CKB directly phosphorylates STAT5B in a non-canonical manner, activating it.
Phosphorylated STAT5B translocates to the nucleus and drives expression of platelet functional genes, leading to hyperactive platelets.
Hyperactive platelets promote tumor metastasis by enhancing cancer cell survival, adhesion, and extravasation in the bloodstream.
Evidence from Studies
Supporting (1)
Community contributions welcome
Exogenous creatine supplementation promotes tumor metastasis via megakaryocyte creatine kinase B-STAT5B signaling.
This study shows that giving creatine supplements to mice makes their platelets more active, which helps cancer spread faster, matching the claim exactly.
Contradicting (0)
Community contributions welcome
Score Breakdown
No multi-axis breakdown available yet. The overall Pro / Against score above is the best signal.
- No clinical evidence is available; the score reflects mechanistic plausibility only.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
Systematic Review of Creatine Supplementation and Tumor Metastasis in Animal Models
Search of multiple databases for animal studies comparing creatine-supplemented vs control groups in tumor models, with meta-analysis of metastasis incidence and size.
Prospective Cohort Study of Creatine Intake and Cancer Metastasis in Humans
Prospective follow-up of cancer patients with and without creatine use, assessing metastasis-free survival, controlling for confounders.
Case-Control Study of Creatine Use in Patients with Metastatic vs Non-metastatic Cancer
Retrospective identification of cancer patients with metastasis (cases) and without (controls), assessing creatine supplementation history via records or interviews.
In Vitro Study of Creatine's Effect on Megakaryocyte CKB Activation and Platelet Function
Culture of megakaryocytes with creatine treatment, measurement of CKB levels, STAT5B phosphorylation, and platelet functional assays; use of CKB inhibitors or knockout to confirm specificity.