Anabolic / 19-Nor

Nandrolone Undecylate (Dynabolon)

Ultra-long ester nandrolone. Very slow release for sustained anabolic effect. 4–6 week injection interval possible. Extremely long clearance time for drug testing.

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Educational reference only. This page does not diagnose, prescribe, or replace care from a licensed professional. Laws, availability, and clinical appropriateness vary by location.

Reference dose100–200 mg every 3–4 weeks (therapeutic); up to 400 mg/week (performance)

Half-life384 hours

Risk flaghigh

Regulatory noteResearch-only flag

Side effects and watch-outs

All nandrolone effects apply — see Deca entry
Very long clearance (12+ months in drug tests)
Prolactin elevation
HPTA suppression
Cardiovascular toxicity
⚠️ Virilisation in women