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EPO (Erythropoietin)

Evidence: ★★★★★ · Status: Prescription, Controlled

💡 Did you know? EPO, the infamous cycling doping drug, is just a hormone your kidneys already release when oxygen runs low — telling your marrow to build more red blood cells.

In plain English

Tells your bone marrow to build more oxygen-carrying red cells — huge endurance boost, which is why it defined cycling's doping era. Thickened blood raises clot/stroke risk.

How it works

Binds the erythropoietin receptor (EPOR) on marrow progenitors → more red blood cells → higher O₂-carrying capacity and VO₂max. The classic endurance doping agent.

Molecular target & official sources

EPOR (NCBI Gene) · Erythropoietin (PubChem)

Watch out

Thrombosis, stroke. WADA-banned. **Bottom line:** Powerful and dangerous; blood-doping cornerstone.

Helps with: Endurance · Bone Health

Stacks with

Shares a pathway — often paired with: Tesamorelin (Egrifta), Human Growth Hormone (Somatropin), Insulin (anabolic misuse), Ligandrol (LGD-4033).

Availability & where to buy

Controlled substance. A controlled substance in most countries — illegal to buy, sell or possess without authorisation (in Singapore: HSA / CNB). Education only.

How it works: the PI3K/Akt growth factor pathway →

Compare EPO (Erythropoietin)

Common questions

Does EPO (Erythropoietin) actually work?

Human-evidence rating: 5 of 5. Tells your bone marrow to build more oxygen-carrying red cells — huge endurance boost, which is why it defined cycling's doping era. Thickened blood raises clot/stroke risk.

What are the risks or side effects of EPO (Erythropoietin)?

Thrombosis, stroke. WADA-banned. Bottom line: Powerful and dangerous; blood-doping cornerstone.

Is EPO (Erythropoietin) legal or approved?

Regulatory status: Prescription, Controlled.