Supplements · Metabolic & Cardiometabolic

creatine prevents cancer

In plain terms: Does creatine fight cancer?

Leans against Supplements 🐭 Non-human evidence🔬 Includes disconfirming

RefutedContestedStrong support

consensus score -0.57

⚖️ Thin evidence — read the needle loosely. The score shows which way the studies lean, but there are too few independent, high-quality ones to place it firmly. Expect this to move as better evidence arrives.

The evidence leans the other way. In animal studies creatine has actually promoted cancer spread, and blocking it slowed colon cancer — the opposite of 'anti-cancer.' Its role is complex and unproven in humans, and there's no basis to take it to prevent cancer.

Evidence ladder

How far up the ladder this claim has climbed. A high consensus on a low rung means "consistent so far," not "proven in people."

Top evidence so far: Animal studies (Animal)

MechanismIn-vitroAnimalObservationalRCTMeta-analysis

How the studies fall

0 support 2 contradict 0 tested null 2 mixed · 4 sources, 2 independent groups

What the evidence shows

Claimed as 'anti-cancer properties' — the preclinical reality is the opposite-leaning and mixed: mouse studies show creatine can *promote* cancer metastasis (Smad2/3), and blocking the creatine transporter *suppresses* colon-cancer growth. Reviews describe dual, context-dependent roles. No human evidence of cancer prevention exists — graded leans-against.

The evidence (4)

Source	Grade	Stance	Quality	Finding
Zhang 2022 · Trends Cell Biol	observational	mixed	low	Review: creatine has dual, context-dependent roles in cancer — both anti-tumor and pro-tumor mechanisms are reported.
Zhang 2021 · Cell Metab	animal	contradicts	moderate	Orthotopic mouse models: creatine PROMOTED cancer metastasis via Smad2/3 — an adverse, not protective, effect.
Kurth 2021 · Sci Adv	animal	contradicts	moderate	Animal study: inhibiting the SLC6A8 creatine transporter suppressed colon-cancer progression, implying creatine availability supports tumor growth.
Kazak 2020 · Nat Rev Endocrinol	observational	mixed	low	Review: creatine metabolism has complex roles in immunity and cancer biology; not a clean anti-cancer agent.

Disagree, or know a study we missed?

We grade by evidence, not opinions. The way to weigh in is to point us to a study we haven't cited (check the evidence table above first), or to flag a problem with one we have. Every submission is reviewed; if it holds up, the grade updates and shows in Science Changes Its Mind.

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Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.