Sustanon-Biosira (Sustatex 300 mg) – Testosterone Mix
Sustanon-Biosira is a high-quality injectable testosterone blend produced by Biosira Steroids, formulated to deliver both fast-acting and long-lasting testosterone release. This compound combines four different testosterone esters to ensure immediate hormonal activity as well as sustained blood testosterone levels over several weeks.
Composition (per 1 ml)
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Testosterone Decanoate – 100 mg
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Testosterone Isocaproate – 60 mg
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Testosterone Phenylpropionate – 60 mg
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Testosterone Propionate – 30 mg
Total potency: 250–300 mg per ml (depending on batch)
Form: Oil-based injectable solution
This carefully balanced ester combination creates a synergistic release pattern that offers both rapid onset and prolonged effectiveness.
How Sustanon-Biosira Works
Short esters such as propionate and phenylpropionate begin working quickly, providing a noticeable testosterone boost within 24 hours. Longer esters like isocaproate and decanoate release testosterone more slowly, maintaining stable hormone levels for up to 3–4 weeks.
The purpose of blending short and long esters is to minimize hormonal fluctuations while delivering consistent anabolic and androgenic effects.
Primary Uses
Medical / TRT Use
Sustanon was originally developed for testosterone replacement therapy (TRT) to restore normal testosterone levels in men suffering from deficiency. It may help improve:
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Libido
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Energy levels
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Overall well-being
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Muscle maintenance
Bodybuilding & Performance
Sustanon-Biosira has become extremely popular among bodybuilders due to its ability to:
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Increase muscle mass
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Enhance strength
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Support recovery
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Maintain an anabolic state
Users typically report 4–8 kg of weight gain per cycle, with part of this increase being water retention.
⚠️ Testosterone mixes are not recommended for women, as elevated androgen levels may cause virilization.
Muscle Growth & Stacking
On its own, Sustanon provides steady and moderate muscle gains. For more pronounced bulking results, it is often stacked with anabolic compounds such as Methandienone (Dianabol). Testosterone also enhances recovery, endurance, and training intensity, making it a foundational steroid in most cycles.
Dosage Guidelines (Informational)
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TRT use: 250 mg every 20 days
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Muscle building: 100–500 mg every 7–10 days
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Bulking cycles: ~250 mg per week (often stacked)
Extremely high dosages (e.g. 1000 mg/week) are generally unnecessary and increase the risk of side effects without proportional benefits.
Cycle Length
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Typical cycle: 6–12 weeks
Post-cycle therapy (PCT) is recommended after prolonged use to help restore natural testosterone production.
Key Advantages of Sustanon-Biosira
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Balanced testosterone release
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Fast onset + long duration
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Strong anabolic and androgenic effects
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Fewer injections required
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Widely used for TRT and bodybuilding
Sustanon-Biosira (Sustatex 300 mg) remains one of the most reliable testosterone blends available, offering hormonal stability, muscle growth, and performance enhancement in one proven formulation.
