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There is no legitimate supplement or current medical dose — drostanolone is no longer marketed as a medicine and is a DEA Schedule III controlled substance. This library does NOT provide a body-composition dosing protocol. For historical context only: in the obsolete breast-cancer indication, drostanolone propionate was given by intramuscular injection (commonly ~100 mg two to three times weekly). Illicit physique use is off-label, unsupervised, and unsupported by any trial. That is not an endorsement of self-administration.

Any time

Injectable drostanolone propionate (historically Masteron / Masteril) — an obsolete oncology product; no current approved form exists

• Anyone seeking it for body composition or athletic performance — a DEA Schedule III controlled substance with no current medical use; possession/use without a prescription is illegal, and it is not a dietary supplement
• Women, adolescents, and anyone wishing to avoid virilization — a potent DHT-class androgen with irreversible virilizing potential
• Pre-existing male-pattern hair loss the user wants to avoid worsening (androgenic effects are not blocked by 5α-reductase inhibitors)

• Other anabolic steroids / testosterone / SARMs
• Warfarin / oral anticoagulants
• 5α-reductase inhibitors (finasteride/dutasteride)