Drostanolone-Propionate

Drostanolone Propionate

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1. Chemical Specifications

• IUPAC Name: (2α,17β)-17-Hydroxy-2-methyl-5α-androstan-3-one propionate

• CAS No.: 521-12-0

• Molecular Formula: C₂₃H₃₆O₃

• Molecular Weight: 360.53 g/mol

• Purity: ≥99.2% (HPLC-UV)

• Melting Range: 102-107°C

• Optical Rotation: +28° to +32° (c=1, CHCl₃)

• Loss on Drying: ≤0.5%

2. Pharmacological Profile

3. Sterility & Stability

• Microbial Limits: <10 CFU/g (USP <61>)

• Endotoxins: <0.5 EU/mg

• Shelf Life: 36 months @ 2-8°C

• Light Sensitivity: Store in amber glass

4. Formulation Guidelines

• Optimal Concentration: 100 mg/mL

• Solvent System:

  • BA: 1.5%

  • BB: 15%

  • Carrier: MCT oil (Pharma grade)

• Filtration: 0.22μm PVDF membrane

5. Clinical Dosing Matrix

6. Quality Certifications

• GMP Compliance: ICH Q7

• Heavy Metals: Meets USP <232>

• Residual Solvents: Class 2 compliant (ICH Q3C)

Benefits of  Drostanolone Propionate

1. Promotes Extreme Muscle Hardness and Density:

• Mechanism: Like other DHT-derivatives, Drostanolone is non-aromatizing, meaning it does not convert to estrogen. This prevents any water retention or bloating.

• Result: When body fat levels are very low (typically below 10%), Masteron gives muscles a hard, dense, “grainy,” and highly defined look. It is considered one of the best steroids for achieving this specific stage-ready condition.

2. Anti-Estrogenic Properties:

• Drostanolone acts as an aromatase inhibitor (AI) in the body. It competes for the aromatase enzyme, helping to block the conversion of other steroids (like testosterone) into estrogen.

• Result: This helps to control and prevent estrogen-related side effects like water retention, gynecomastia (“gyno”), and bloating when combined with other aromatizing compounds. This contributes significantly to the “dry” and hard look.

3. Enhanced Muscle Definition and Vascularity:

• By eliminating subcutaneous water and having a slight diuretic effect, it drastically increases muscle separation and vascularity, making veins more prominent.

4. Strength Maintenance During a Caloric Deficit:

• While not a mass-builder, it is an excellent agent for helping to preserve lean muscle tissue and strength when an athlete is in a severe caloric deficit pre-contest.

5. Psychological Effects:

• Many users report an increase in aggression, confidence, and a sense of well-being on cycle, which they attribute to its strong androgenic nature. This can be a double-edged sword, as noted in the risks below.