Testosterone Propionate 100mg is a single-ester testosterone formulation known for its quick onset and short duration of action. It is widely used in both medical and athletic contexts to treat low testosterone levels and to support muscle building, recovery, and overall vitality. Due to the propionate ester’s short half-life, frequent administration (typically every other day) is necessary to maintain stable hormone levels.
In bodybuilding, it is especially popular during cutting phases as it tends to cause less water retention compared to longer esters. It also offers users more control over their hormone cycles due to its rapid clearance from the body. However, its short half-life also means it may be more prone to injection site irritation.
Benefits
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Fast-acting testosterone release
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Increases lean muscle mass and strength
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Boosts libido and energy
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Improves recovery and endurance
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Better control over hormone levels due to short duration
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Less water retention than longer esters
Side effects
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Injection site pain or irritation
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Gynecomastia (from estrogen conversion)
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Acne and oily skin
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Mood swings and aggression
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Suppression of natural testosterone production
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Elevated hematocrit and blood pressure
Dosages & Protocol
Dosages for Men:
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300–600mg per week (equal to 3–6ml per week, split into 0.5–1ml per injection)
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Common protocol: 100mg (1ml) every other day
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Duration: 8–12 weeks
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Aromatase inhibitors like Arimidex or Nolvadex may be used to manage estrogenic side effects
Not recommended for women due to high chance of virilization.
How to administer
Administering Testosterone Propionate 100mg requires proper intramuscular injection technique due to its oil-based composition.
Gather Supplies:
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1ml syringe
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Two needles (one for drawing, one for injecting – 25–27 gauge)
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Alcohol swabs
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Testosterone Propionate vial
Prepare the Injection Site:
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Wash hands thoroughly
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Clean injection site (glute, thigh, or shoulder) with an alcohol swab
Prepare the Syringe:
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Attach drawing needle to syringe
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Draw desired volume (e.g., 1ml = 100mg)
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Replace with new sterile needle
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Remove air bubbles
Administer the Injection:
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Insert needle at a 90° angle into muscle
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Inject slowly and steadily
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Withdraw needle and apply alcohol swab with light pressure
Post-Injection Care:
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Rotate sites regularly
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Massage area lightly to reduce soreness
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Dispose of needle in sharps container
Storage
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Store at 15–25°C
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Keep away from heat and direct light
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Do not refrigerate or freeze
Half-life & detectability
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Half-life: Approximately 2–3 days
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Detection time: Up to 2–3 weeks in standard drug testing
For athletes subject to drug testing, it is crucial to consider these detection times to avoid positive tests for banned substances.