Half-lives / HCG
HCG half-life
HCG stays in your system about 6.9 days — five half-lives at a half-life of ≈ 33 h (33 h). The computed decay curve is below, with the primary source cited.
Also searched as: human chorionic gonadotropin.
Source: hCG pharmacokinetic literature (see monograph)
Frequently asked
How long does HCG stay in your system?
With a half-life of ≈ 33 h, roughly 97% of a single HCG dose is cleared after five half-lives — about 6.9 days. Repeated dosing accumulates and takes correspondingly longer to clear.
What does a ≈ 33 h half-life mean in practice?
Every 33 h, 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 HCG half-life number come from?
hCG pharmacokinetic literature (see monograph). We cite a primary source for every half-life we publish and version every change.
Related: HCG reconstitution calculator · HCG dose charts
Related half-lives
Other TRT & hormonal support — how long each stays active:
Guides mentioning HCG
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.