Mastebull 100 – Bull Pharma USA
Mastebull 100 by Bull Pharma USA is an injectable product containing 100mg of Drostanolone Propionate per mL in a sterile oil-based formulation. Manufactured by Bull Pharma USA, it is produced under quality-controlled manufacturing standards. Drostanolone Propionate is the short-acting propionate ester of drostanolone, an anabolic-androgenic steroid (AAS) derived from dihydrotestosterone (DHT). It has been studied for its pharmacological characteristics, metabolism, and androgen receptor activity.
Product Highlights
- Brand: Bull Pharma USA
- Product Name: Mastebull 100
- Active Compound: Drostanolone Propionate
- Strength: 100mg/mL
- Dosage Form: Injectable Solution
- Compound Class: Anabolic-Androgenic Steroid (AAS)
- Manufactured under quality-controlled production standards
Product Information
Mastebull 100 contains 100mg of Drostanolone Propionate per milliliter in a sterile injectable formulation. The propionate ester provides a relatively short duration of action compared with longer esters such as drostanolone enanthate. Drostanolone Propionate has historically been investigated for its pharmacokinetic properties, androgen receptor binding, metabolism, and biological activity. These findings do not establish safety or effectiveness for unapproved human uses.
The exact vial size, total content, carrier oils, excipients, and packaging may vary depending on the production batch. Users should verify these details using the product label or the manufacturer’s official documentation before use.
For complete information regarding formulation, batch identification, storage recommendations, analytical testing, and product verification, consult the manufacturer’s official documentation.
Product Specifications
| Specification | Details |
|---|---|
| Product Name | Mastebull 100 |
| Brand | Bull Pharma USA |
| Active Compound | Drostanolone Propionate |
| Strength | 100mg/mL |
| Dosage Form | Injectable Solution |
| Compound Class | Anabolic-Androgenic Steroid (AAS) |
| Manufacturer | Bull Pharma USA |
Storage Instructions
- Store according to the manufacturer’s recommendations.
- Keep in a cool, dry place away from direct sunlight.
- Protect from excessive heat and freezing.
- Keep the vial tightly sealed until use.
- Keep out of the reach of children.
Important Information
Drostanolone Propionate is a prescription-regulated anabolic-androgenic steroid in many jurisdictions. It is not approved for bodybuilding or performance enhancement, and misuse may result in serious health risks. Always comply with applicable laws and follow the manufacturer’s guidance regarding handling, storage, and product verification.



