Mastavex-P® 100

Name: Mastavex-P® 100
SKU: 1836
Availability: InStock

$60.00

Mastavex-P 100 is an injectable Masteron Propionate, dosed at 100 mg/mL, which is the fast-acting version of the drostanolone compound. Drostanolone propionate has a short half-life (~2–3 days), requiring every-other-day injections, but this quick action makes it especially useful for short cycles and pre-contest phases where immediate effects on muscle hardness are desired. Mastavex-P 100 delivers potent androgenic effects without aromatization, significantly enhancing muscle definition, firmness, and vascularity soon after administration. It is often employed in the final weeks leading up to a competition or event to rapidly refine the physique, as it can quickly reduce subcutaneous water (through its anti-estrogenic nature) and add a finishing polish to the muscles. Additionally, Masteron Propionate contributes to strength and aggression in training, aiding athletes who need to maintain performance while cutting. Its synergy with other fast-acting compounds is well-known; for example, it’s a key component of the famed “tren/test/mast” cutting stack. Because of its DHT origin, it can also help buffer estrogenic effects from other steroids, making it valuable even in bulking stacks to keep gains dry. Mastavex-P 100 is typically chosen by those who are serious about achieving a top-tier, competitiongrade look or by anyone wanting a rapid improvement in muscle tone and tightness in a short timeframe.

Category: Injectables

Description
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Chemical Name: Masteron Propionate (Drostanolone Propionate)
Chemical Structure: Structural formula image placeholder
Molecular Formula: C₂₃H₃₆O₃
CAS Number: 521-12-0

Key Benefits:

Quickly intensifies muscle hardness and definition, yielding visible improvements in physique within weeks
Acts as a mild anti-estrogen, reducing water retention and preventing estrogen-related side effects
Short-acting ester allows fine control over cycle length and timing of peak effect (ideal for lastminute contest prep)
Boosts strength and maintenance of muscle mass during caloric deficits, helping athletes look full and strong while cutting
Can be used to complement bulking cycles as well, to keep gains lean and improve the overall muscle quality

Known For:

Mastavex-P 100 is known for producing that “granite-hard” look in a short span, which is why it’s a staple in many competitive bodybuilders’ regimens near showtime. It’s often recognized as part of the ultimate cutting stack with Trenbolone Acetate and Testosterone Propionate, where its inclusion is critical for achieving maximal hardness and sharpness. Masteron Propionate is also famously effective even at moderate doses for those seeking to enhance their beach-ready physique without excessive bulk.

Synergistic Stacking:

Testavrex® 100 – Testosterone Propionate is a natural partner for Mastavex-P in fast-acting cycles, ensuring muscle maintenance and size while Masteron adds hardness and shape (crucial for short pre-contest or mini-cuts)
Trena-Jet® 100 – Trenbolone Acetate stacked with Mastavex-P creates a cutting-edge combination for extreme definition and strength; Masteron magnifies tren’s drying and hardening effects
Durabolin® 100 – Nandrolone Phenylpropionate can complement a short bulking or powerlifting cycle with Mastavex-P, adding joint support and mass; Masteron in turn keeps the gains lean and counteracts any estrogen from nandrolone for a cleaner outcome

Why Choose Blckline:

Blckline Pharma Group stands for uncompromising quality in performance enhancement. All our injectable products are formulated with pharmaceutical-grade ingredients and compounded under strict, compliant, USP <503a> conditions to ensure purity, potency, and adherence to label claims. By choosing Blckline, athletes and health enthusiasts receive products they can trust for safety, consistency, and superior results.

Ingredients / Label Composition:

Each mL of Mastavex-P 100 contains 100 mg of Drostanolone Propionate (USP) as the active ingredient. Inactive ingredients include benzyl benzoate, benzyl alcohol, and MCT oil as the sterile carrier solution.