Norclostebol
4-chlorinated 19-nortestosterone derivative combining the aromatization blockade of clostebol with the reduced androgenicity of 19-nor compounds. Very mild compound with extremely low androgenic activity. Used medically in France and some European countries for anemia. Very limited modern data.
Mechanism of Action
4-chloro group prevents aromatization. 19-nor structure minimizes 5α-reductive androgenicity. Direct weak AR agonist. Low SHBG binding. Due to extremely low androgenic activity, very little virilization risk even in women — historically used in female patients.
Typical Dosing
⚠ Warning Flags
- •Extremely rare — virtually unavailable on any market
Effect Profile
Side Effect Profile
Research Studies
Anabolic and androgenic dissociation: 4-chloro-19-nortestosterone derivatives
Potts GO, et al. · 1975
Animal bioassay data establishing norclostebol's unusually favorable anabolic:androgenic separation; levator ani:ventral prostate ratio > 5:1 suggesting excellent anabolic selectivity.