Mast-P is an oil based solution of Drostanolone Propionate for IM injection. Drostanolone is a steroid with significant anabolic and androgenic effects. The fast acting ester produces a rapid increase in serum levels which remain elevated for 3-4 days. Drostanolone promotes significant increases in strength, muscle anabolism and aggression, and has been demonstrated to reduce body fat.


  • Drostanolone Propionate 100mg/ml
  • For I.M. use only

Chemical Information

  1. Chemical: 17β-Hydroxy-2α-methyl-5α-androstan-3-one
  2. Molecular Formula: C20H32O2
  3. Molecular Weight: 304.46688 g/mol
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