Masteron P 100mg/mL – MCT Oil – 10mL Vial

Drostanolone Propionate, widely known by its pharmaceutical brand name Masteron, is a short acting anabolic compound derived from dihydrotestosterone (DHT) with a pharmacological profile that distinguishes it meaningfully from most other injectable anabolic compounds in research. CSD’s formulation delivers 100mg/mL in a 10mL multi dose vial using MCT (medium chain triglyceride) oil as the carrier base. A well suited pairing for a short acting compound requiring every other day administration, where MCT oil’s ultra low viscosity minimizes injection site discomfort across the frequent administration schedule that propionate ester protocols demand.

The propionate ester gives Masteron a half life of approximately 2–3 days, requiring every other day administration in documented research protocols to maintain stable blood concentration levels; an administration frequency shared with other propionate and acetate ester compounds like Testosterone Propionate and Trenbolone Acetate. This short active window demands greater logistical commitment than long acting ester alternatives but offers researchers precise control over compound levels and fast clearance upon discontinuation, making it well suited to protocols where adjustability is a priority variable.

Masteron’s most distinctive research characteristic is its interaction with estrogen at the receptor level. As a DHT derived compound it does not aromatize, but beyond simply not converting to estrogen, Drostanolone has documented activity as an aromatase inhibitor directly competing with aromatase enzyme binding and reducing estrogenic conversion from other compounds present in the research environment. This anti estrogenic mechanism makes Masteron a uniquely positioned compound in androgen research, studied not only for its anabolic activity but for its role in modulating estrogenic activity within combined compound protocols. A research characteristic shared with no other injectable anabolic compound in CSD’s range.

Every batch of CSD’s Masteron Propionate is third party lab tested for concentration accuracy and purity prior to release, with COA documentation available on request. Canada Steroid Depot has supplied Canadian customers with consistently verified, accurately dosed compounds for years, and Masteron Propionate is a consistently sought after product across our injectable anabolic range. All orders ship discreetly across Canada in plain, unmarked packaging with no identifying information on the exterior.

Store at room temperature away from direct light and heat. Do not freeze. Intended for research purposes only.

Commonly researched alongside a testosterone base compound. Browse CSD’s full injectable range and PCT compounds for complete protocol sourcing.