Sustanon is an injectable anabolic-androgenic steroid that contains a blend of four testosterone esters — testosterone propionate, phenylpropionate, isocaproate, and decanoate. Each ester has a different absorption rate, providing a stable and sustained release of testosterone into the bloodstream.
Originally developed for hormone replacement therapy (HRT), Sustanon became widely used in sports for its ability to maintain high testosterone levels, support muscle growth, and improve strength and endurance throughout long cycles with fewer injections.
The ampoule form ensures precise dosing, sterility, and convenience for single-use administration, often preferred by athletes seeking consistent results.
Main effects of sustanon
💪 Promotes steady muscle growth and improved recovery
🔥 Increases protein synthesis and nitrogen retention
🩸 Enhances red blood cell production and oxygen delivery
⚡ Boosts strength, endurance, and overall performance
💧 Improves libido, energy, and motivation
🧠 Stabilizes mood and mental focus during intensive training
How to take sustanon
Administration
Route: intramuscular injection
Frequency: once every 5–7 days, depending on the ester mix and cycle goal
Half-life: 7–15 days due to the combination of short and long esters
Dosage
Beginners: 250 mg per week
Intermediate users: 500 mg per week
Advanced users: up to 750 mg per week (short-term use only)
Typical cycle length: 8–12 weeks
Sustanon is often combined with nandrolone, boldenone, or stanozolol for balanced anabolic effects and improved muscle quality. Post-cycle therapy (PCT) with clomiphene citrate or tamoxifen is recommended after completing a cycle.
Possible side effects
Water retention and bloating
Acne and oily skin
Increased blood pressure
Temporary suppression of natural testosterone
Gynecomastia (rare without aromatase inhibitors)
Contraindications
Prostate or breast cancer
Severe cardiovascular disease or hypertension
Liver or kidney dysfunction
Known hypersensitivity to testosterone esters
How to store
Keep at room temperature (20–25 °C / 68–77 °F)
Protect from light and moisture
Do not freeze or expose to heat
Store ampoules in their original packaging until use
How does sustanon work
Sustanon provides a timed-release system of testosterone delivery. The shorter esters (propionate and phenylpropionate) act quickly, while the longer ones (isocaproate and decanoate) maintain stable hormone levels for days after injection.
Once released, testosterone binds to androgen receptors in muscle cells, activating anabolic processes such as protein synthesis, nitrogen retention, and increased IGF-1 production. These effects lead to greater muscle hypertrophy, enhanced recovery, and improved energy metabolism.
Sustanon also stimulates red blood cell production, improving oxygen transport and endurance. By maintaining a high and consistent testosterone concentration, it supports an ideal anabolic environment for muscle growth and physical performance while minimizing hormonal fluctuations between injections.
