Metandienone (also known as Methandrostenolone or Dianabol) is a synthetic anabolic–androgenic steroid (AAS) derived from testosterone. Metandienone (Dianabol) — API Specification Name: Metandienone Synonyms: Methandrostenolone, Dianabol Chemical class: Anabolic–androgenic steroid (AAS) CAS Number: 72-63-9 Molecular Formula: C₂₀H₂₈O₂ Molecular Weight: ~300.44 g/mol Description: 17-alpha-alkylated anabolic steroid API Assay / Purity Typical pharmaceutical API quality expectations: Assay (potency): 97.0% – 103.0% Related substances / impurities: Within specified limits Residual solvents: Compliant with ICH Q3C guidelines Heavy metals: Within pharmacopeial limits Metandienone enters androgen-responsive cells (e.g., skeletal muscle) It binds to the androgen receptor (AR) in the cytoplasm The hormone–receptor complex translocates into the cell nucleus It binds to androgen response elements (AREs) on DNA USES : Muscle wasting conditions Severe weight loss Osteoporosis Recovery from major illness or surgery