Testosterone Undecanoate 1000mg/4mL UK by AASScripts is a long-acting injectable testosterone ester formulated for individuals who need sustained testosterone support with fewer injections. Unlike shorter esters like Enanthate or Cypionate, Undecanoate provides stable testosterone levels over several weeks, making it a preferred option for testosterone replacement therapy (TRT) or longer anabolic cycles.

Each 4mL vial contains a total of 1000mg of Testosterone Undecanoate (250mg/mL), suspended in a sterile carrier oil for smooth intramuscular administration. Its ultra-long half-life reduces the frequency of injections, often requiring just one shot every 2–3 weeks for TRT protocols.

This compound is ideal for users looking for steady hormone levels, improved libido, muscle retention, mental clarity, and overall well-being. Athletes also use it for off-season bulking where consistent androgenic support is needed without the peaks and crashes.

📚 Learn more: NHS UK – Testosterone Replacement Therapy

Testosterone Undecanoate 1000mg/4ml UK Use Cases

• Ideal for low-testosterone treatment

• Supports lean muscle growth and strength

• Infrequent injection schedule (bi-weekly or monthly)

• Helps with libido, energy, mood, and bone density

• Long-acting support during long cycles or bridges

When and How to Use

• Inject 1000mg (4mL) intramuscularly every 2–3 weeks

• For bodybuilding: dose can be split weekly depending on stack

• No need for frequent pinning like shorter esters

• May require AI to manage estrogen conversion

• Often stacked with Deca Durabolin, EQ, or Primobolan for long cycles