Drostanolone Biosira (Mastotex) 100 mg – Injectable
Drostanolone Biosira, also known as Mastotex / Masteron Propionate, is a high-quality injectable anabolic steroid widely used by experienced athletes and competitive bodybuilders. Produced under pharmaceutical-grade standards, this compound is especially valued for muscle hardness, fat reduction, and competition conditioning.
Product Overview
-
Active ingredient: Drostanolone Propionate
-
Potency: 100 mg / ml
-
Vial size: 10 ml
-
Half-life: 4–6 days
-
Cycle length: 6–10 weeks
-
Steroid class: DHT derivative
-
Aromatization: None (non-estrogenic)
Drostanolone Propionate does not convert to estrogen, making it ideal for athletes seeking a dry, hard, and vascular look without water retention.
How Drostanolone Biosira Works
As a DHT-based compound, Drostanolone Propionate provides strong androgenic effects with moderate anabolic activity. It enhances muscle density and definition rather than bulk mass. Because it does not aromatize, users avoid common estrogen-related side effects such as gynecomastia or excessive water retention.
Masteron Propionate is often compared to Trenbolone; however:
-
Drostanolone is more androgenic and cosmetic-focused
-
Trenbolone is more anabolic with greater mass gains
Drostanolone excels during cutting phases and pre-contest preparation, where muscle quality matters more than size.
Medical Background
Originally developed in the late 1950s and introduced clinically in the 1960s, Drostanolone was used for the treatment of breast cancer in women. Its anti-estrogenic properties and effectiveness quickly made it popular beyond medical use.
Athletic & Bodybuilding Use
Drostanolone Biosira is best suited for athletes with already low body fat levels. Its main benefits include:
-
Increased muscle hardness and density
-
Enhanced vascularity
-
Accelerated fat loss
-
Reduced subcutaneous water
-
Improved recovery and training performance
It is most commonly used 4–8 weeks before competition or during advanced cutting cycles.
Dosage Guidelines (Informational)
Typical dosing protocols reported by experienced users:
-
50–100 mg daily or every other day
-
Approx. 300–400 mg per week for optimal results
Due to its short ester, injections are commonly performed daily or every two days to maintain stable blood levels.
Stacking Options
Drostanolone should not be used alone. It is most effective when stacked with other anabolic steroids, such as:
-
Testosterone (Propionate or Enanthate)
-
Trenbolone Acetate
-
Stanozolol (Winstrol)
-
Oxandrolone (Anavar)
-
Boldenone
These combinations enhance fat loss, muscle hardness, and overall conditioning.
Side Effects & Safety
Drostanolone does not cause estrogenic side effects. However, androgenic side effects may occur, including:
-
Acne
-
Hair loss (in genetically predisposed individuals)
-
Increased body hair
-
Changes in cholesterol levels
Natural testosterone production is suppressed, therefore Post Cycle Therapy (PCT) using HCG and Clomiphene (Clomid) is strongly recommended.
Steroid Profile
-
Androgenic index: 25
-
Anabolic index: 62
-
Estrogenic activity: Very low
-
Liver toxicity: Low
-
Progestational activity: Low
Post Cycle Therapy (PCT)
PCT should begin approximately 15–19 days after the last injection. Proper PCT helps restore natural testosterone production and hormonal balance. Because Drostanolone does not aromatize, estrogen blockers like Arimidex are usually unnecessary during the cycle.
Key Benefits at a Glance
-
Extreme muscle hardness
-
No water retention
-
Strong fat-burning effect
-
Enhanced vascularity
-
Ideal for competition preparation
-
Preserves muscle quality during cutting
Drostanolone Biosira (Mastotex) is a premium cutting compound for athletes seeking maximum definition, dryness, and muscle quality. When used responsibly and stacked correctly, it delivers one of the most aesthetic physiques achievable in competitive bodybuilding.
