Sustanon 300mg is a well-known testosterone blend combining four testosterone esters:
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Testosterone Propionate – fast-acting
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Testosterone Phenylpropionate – short-acting
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Testosterone Isocaproate – medium-acting
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Testosterone Decanoate – long-acting
This mix is engineered to provide a quick onset of action from the shorter esters while maintaining stable blood levels over time thanks to the longer esters. It delivers the full spectrum of testosterone’s anabolic benefits including muscle growth, enhanced strength, improved recovery, and boosted libido.
The 300mg concentration allows users to inject a smaller volume for effective dosing, making it a preferred option for those aiming for convenience and efficacy in their cycle.
Benefits
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Builds lean muscle mass and strength
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Enhances protein synthesis and nitrogen retention
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Increases libido and sense of well-being
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Improves recovery and training performance
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Sustained testosterone release for stable hormone levels
Side effects
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Estrogenic effects: gynecomastia, water retention, bloating
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Androgenic effects: acne, oily skin, hair thinning
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Suppression of natural testosterone production
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Possible mood swings or aggression
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Requires aromatase inhibitor (e.g., Arimidex) for estrogen control
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Not recommended for women due to high risk of virilization
Dosages & Protocol
Dosages for Men:
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Beginner: 300mg per week (1ml)
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Intermediate: 600mg per week (2ml)
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Advanced: up to 900mg per week (3ml)
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Cycle duration: 10–14 weeks
Often stacked with other anabolic compounds for bulking or recomposition. Always follow with proper PCT using Clomid or Nolvadex.
Not recommended for women due to high risk of virilization.
How to administer
Administer via intramuscular injection using a 23–25 gauge, 1–1.5 inch needle.
Injection sites include glute, thigh, or deltoid.
Inject once or twice per week to maintain consistent blood levels.
Always clean the injection site thoroughly with an alcohol swab before injecting. Rotate injection sites and use proper sterile technique.
Storage
Store in a cool, dry place away from sunlight and heat. Do not refrigerate. Keep vial sealed between uses.
Half life & detectability
Half-Life: Varies per ester, average composite half-life is approximately 15 days
Detection Time: Up to 3 months after last injection
For athletes subject to drug testing, it is crucial to consider these detection times to avoid positive tests for banned substances.