Half-lives / Testosterone Cypionate
Testosterone Cypionate half-life
Testosterone Cypionate stays in your system about 40 days — five half-lives at a half-life of ≈ 8 days (192 h). The computed decay curve is below, with the primary source cited.
Also searched as: test cyp, test c, cypionate, testosterone.
Source: Testosterone cypionate PK literature (cited range 4–10 days; see monograph)
Frequently asked
How long does Testosterone Cypionate stay in your system?
With a half-life of ≈ 8 days, roughly 97% of a single Testosterone Cypionate dose is cleared after five half-lives — about 40 days. Repeated dosing accumulates and takes correspondingly longer to clear.
What does a ≈ 8 days half-life mean in practice?
Every 8 days, the remaining amount halves: 100% → 50% → 25% → 12.5%, and so on. The curve above plots exactly this decay for a single dose.
Where does this Testosterone Cypionate half-life number come from?
Testosterone cypionate PK literature (cited range 4–10 days; see monograph). We cite a primary source for every half-life we publish and version every change.
Related: Testosterone Cypionate reconstitution calculator · Testosterone Cypionate dose charts
Related half-lives
Other TRT & hormonal support — how long each stays active:
Guides mentioning Testosterone Cypionate
See your own estimated levels
The Zyra Track app plots this curve from the doses you actually log — accumulation, overlaps, and all. Free during the founding period.
Zyra Track is a research and educational utility. Nothing on this page is medical advice, a dosing recommendation, or an endorsement of any compound. We never sell or source compounds and refuse sourcing questions. Consult a qualified clinician for decisions about your health.