LAST UPDATED JAN 21, 2026
/hrt/masculinizing/testosterone-cypionate

Testosterone Cypionate

[testosterone]
Rev: 2025.12
Summary
Long-acting injectable testosterone, typically injected every 7-14 days

DESCRIPTION

Testosterone Cypionate is a long-acting esterified form of testosterone commonly used for intramuscular and subcutaneous injection. It has a half-life of approximately 8 days, making it suitable for weekly or biweekly dosing. It is the most commonly prescribed injectable testosterone in the United States.

DOSING GUIDELINES

RouteDose RangeFrequencyTarget Levels
Injection (IM)50mg100mgEvery 7 days500-800 ng/dL (trough)
Injection (SubQ)40mg80mgEvery 7 days400-700 ng/dL (trough)

DETAILED NOTES

Injection (IM)

Standard intramuscular injection. Use 22-25g needle, 1-1.5 inch length for IM. Inject into vastus lateralis (outer thigh) or ventrogluteal (upper outer glute). Warm oil to body temperature for easier injection. Rotate sites.

Injection (SubQ)

Subcutaneous injection is increasingly popular. Use 25-27g needle, 0.5-0.625 inch. Inject into belly fat or thigh fat. Less painful, easier to self-administer. Some split into 2x weekly (e.g., 25-40mg twice weekly) for very stable levels.

Rev: 2025.12hrt.fm