Testosterone Propionate 100mg is a short-acting form of testosterone suspended in oil. It contains testosterone bound to the propionate ester, which causes it to be released into the bloodstream quickly after injection. This makes it ideal for users who prefer tighter control over hormone levels or who want to assess response to testosterone more quickly.
In medical use, it treats low testosterone in men (hypogonadism), boosting energy, libido, and general well-being. In bodybuilding, Testosterone Propionate 100mg is often used in cutting cycles, as it promotes lean muscle retention, hardness, and fat loss with less water retention than longer esters.
Due to its fast action, it must be injected every other day or even daily for stable levels, but this also allows quicker clearance from the body post-cycle, making it easier to transition into post-cycle therapy (PCT).
Benefits
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Rapid onset of effects
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Increases lean muscle mass and strength
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Enhances libido and sexual function
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Improves mood, energy, and workout performance
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Supports fat loss and muscle definition
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Reduced water retention compared to long esters
Side effects
Despite its benefits, Testosterone Propionate 100mg may cause the following side effects:
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Estrogenic effects like water retention and gynecomastia (less common than with longer esters)
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Acne or oily skin
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Mood changes or aggression
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Suppression of natural testosterone production
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Injection site pain or irritation due to frequent administration
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Hair loss in those genetically predisposed
These can be managed with proper aromatase inhibitors and a well-structured cycle.
Dosages & Protocol
Dosages for Men:
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Beginner: 300mg per week (3ml/week) – split into 3 injections (e.g., Mon/Wed/Fri)
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Intermediate: 400–500mg per week (4–5ml/week) – split into 3–4 injections
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Advanced: 500–700mg per week (5–7ml/week) – injected every other day or daily
How to administer – reconstitution and how to inject
Testosterone Propionate 100mg is pre-mixed in oil and does not require reconstitution
Injection:
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Use a 1–3ml syringe with a 25–27 gauge needle (1 inch for leaner individuals, 1.5 inch for deeper muscle penetration)
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Inject intramuscularly into the glute, thigh, or deltoid
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Clean the injection site thoroughly with an alcohol swab
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Aspirate slightly before injection to avoid intravascular injection
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Inject slowly and massage the area after injection to minimize post-injection pain
Storage
Store at room temperature in a dry place away from light and heat
Keep vial sealed tightly when not in use
Half life & detectability
Half-Life: Approximately 1.5–2 days
Detection Time: Detectable in the system for 2–3 weeks after last injection, depending on individual metabolism and testing sensitivity
For athletes subject to drug testing, it is important to consider these detection times and plan accordingly to avoid positive tests for banned substances.