At a glance
Effects
- Lean muscle gain: Stimulates protein synthesis and nitrogen retention, supporting steady, sustainable lean mass over long cycles.[2][6]
- Increased appetite: Boldenone reliably increases appetite, an effect originally valued in veterinary use to add body weight.[5][3]
- Raised red blood cells: Stimulates erythropoietin and red-cell production, increasing oxygen-carrying capacity and endurance — but also blood thickness.[5][7]
- Low estrogenic activity: The C1–2 double bond reduces aromatisation, so estrogen-related effects are lower than with testosterone.[1][2]
Anabolic-androgenic steroid (injectable)
~14 days (IM)
Intramuscular injection
US DEA Schedule III; not FDA-approved for humans
Up to ~5 months (reported longer)
About Boldenone Undecylenate
Every point here is drawn from public medical and harm-reduction sources. A bracketed number after a claim — like [1]— is a reference: tap it to open the exact source it's based on (numbered list at the bottom). It is not a rating or score. Educational information, not medical advice.
Product specifics
- Est. delivery
- 3–7 business days · EU tracked
Product details as stated by the vendor (claims, not independently verified). Delivery is our standard EU estimate.
What it is
Boldenone undecylenate (brand names Equipoise, Parenabol) is an injectable anabolic-androgenic steroid (AAS) used mainly in veterinary medicine, especially in horses, and is no longer approved for human use.[1][3] It is the long-chain ester of boldenone, a testosterone derivative, and is used illicitly to improve physique and performance.[1][2]
How it works
Boldenone undecylenate is a prodrug: after intramuscular injection it forms an oil depot from which it is slowly released and hydrolysed to active boldenone, which acts as an agonist of the androgen receptor.[1][4] Boldenone increases nitrogen retention, protein synthesis, appetite, and stimulates erythropoietin release from the kidneys, driving red-blood-cell production.[5] It has strong anabolic but only moderate androgenic effects, with low estrogenic activity and little progestogenic activity.[1] Because it is not 17α-alkylated, it carries little or no direct hepatotoxicity risk of the kind seen with oral steroids.[1]
Risks & side effects
Most important: The most important risk is a marked rise in red blood cells and haematocrit (polycythemia) — boldenone is among the most notorious AAS for this — which thickens the blood and raises the risk of clots, stroke, and heart attack.[7][8] Combined with unfavourable shifts in cholesterol and its very long clearance, cardiovascular monitoring is essential.[8][9]
Common
Serious
- Elevated haematocrit/polycythemia raising risk of clots, stroke and heart attack[7][8]
- Unfavourable lipid changes (lower HDL, higher LDL) accelerating atherosclerosis[9]
- Cardiovascular events including cardiomyopathy reported with AAS abuse[11]
- Voice deepening and other virilising effects, especially in women[1]
Safety & harm reduction
- Women, due to risk of virilisation including irreversible voice deepening[1]
- Anyone with elevated haematocrit, clotting disorders or significant cardiovascular disease, given its strong effect on red-cell mass[7][8]
- People with pre-existing liver or kidney impairment, given reported hepatorenal stress at high doses[12][13]
- Complete blood count / haematocrit regularly; consider intervention (e.g. blood donation or dose reduction) if haematocrit becomes excessive[5][8]
- Blood pressure[9]
- Lipid panel (HDL/LDL)[9]
- Liver enzymes (ALT, AST, GGT) and kidney function[10][13]
- Testosterone and pituitary-gonadal hormones for suppression and recovery[10]
- As a long-ester injectable, plan long cycles; it takes ~4–8 weeks to reach stable blood levels[5][9]
- Users commonly run a testosterone base at an equal or higher dose to avoid low-estrogen symptoms because boldenone can act as a mild aromatase inhibitor in some people[9]
- Plan post-cycle therapy and stop well in advance given very slow clearance[9][10]
- Monitor and manage haematocrit, blood pressure and lipids throughout[8][9]
Dosage context
No human medical dosing is established because boldenone undecylenate is not FDA-approved for human use; it is a Schedule III controlled substance.[1] Community sources describe long cycles (often 12–16 weeks) reflecting its ~14-day half-life and slow build-up, but these are commonly-reported illicit-use patterns, not a prescription, and should not be taken as safe guidance.[5][9] Any reported figures come from non-authoritative bodybuilding sources and are not medically validated.[5]
Sources
- 1.Wikipedia – Boldenone undecylenate
- 2.Fit Science – Equipoise guide (anabolic/androgenic ratio, aromatisation)
- 3.University of Hertfordshire AERU – Boldenone undecylenate properties
- 4.BenchChem – Boldenone undecylenate mechanism (prodrug, AR agonist)
- 5.Wikipedia – Boldenone (mechanism, erythropoiesis)
- 6.ChemicalBook – Boldenone undecylenate (veterinary use, cutting profile)
- 7.Swolverine – Equipoise vs Halotestin (polycythemia, suppression, PCT)
- 8.VitalMetrics – Boldenone blood-marker effects (haematocrit, lipids)
- 9.ScienceInsights – Boldenone uses, risks (lipids, cardiovascular, WADA)
- 10.Steroidology – Elevated hematocrit and AAS monitoring
- 11.Hilaris – Boldenone abuse and dilated cardiomyopathy (case report)
- 12.PMC – Boldenone-induced cardiac toxicity (animal study)
- 13.PMC – Boldenone hepatorenal impairment by oxidative damage
This information is provided for educational and harm-reduction purposes only. It is not medical advice. These substances can carry serious health risks; effects and safe use vary by individual. Consult a qualified healthcare professional before use. Legal status varies by country — it is your responsibility to know your local law. We do not encourage misuse.
Other options for Boldenone Undecylenate· 16 offers
Same compound from different labs/brands and pack sizes. Tap a row to switch brand — the price and buy button update instantly.
This compound comes in different forms (e.g. injectable vs oral vs topical). Cost per mg is only comparable within the same form.
| Brand | Form | Strength | Pack | Price | Per mg |
|---|---|---|---|---|---|
Driada | vial | 250 mg/ml | 10 ml | 48,90 € | ★€0.020/mg |
Generic | topical-lotion | 100 mg/ml | 100 ml | 49,90 € | €0.005/mg |
Generic | — | — | 57,90 € | — | |
Generic | vial | 300 mg/ml | 10 ml | 59,90 € | €0.020/mg |
Generic | vial | 250 mg/ml | 10 ml | 59,90 € | €0.024/mg |
Generic | vial | 250 mg/ml | 10 ml | 64,90 € | €0.026/mg |
EVO | vial | 250 mg/ml | 10 ml | 64,90 € | €0.026/mg |
GenericSelected | vial | 200 mg/ml | 10 ml | 64,90 € | €0.032/mg |
Generic | vial | 250 mg/ml | 10 ml | 68,90 € | €0.028/mg |
Meta | vial | 200 mg/ml | 10 ml | 74,90 € | €0.037/mg |
Generic | vial | 250 mg/ml | 10 ml | 89,90 € | €0.036/mg |
Generic | vial | 500 mg/ml | 10 ml | 99,99 € | €0.020/mg |
Intex Pharma | vial | 300 mg/ml | 10 ml | 114,99 € | €0.038/mg |
Hemi Pharma | vial | 300 mg/ml | 10 ml | 114,99 € | €0.038/mg |
Generic | oral-liquid | 40 mg/ml | 30 ml | 124,99 € | €0.104/mg |
Generic | — | — | 279,99 € | — |