Calculators
The trade-off for a long ester is a long clearance time — worth factoring into PCT timing and into planning around any upcoming tests.
One of the longest-acting esters here: a half-life around 8-9 days, so levels build up slowly and linger long after the last shot.
Buildup in the body
Steady-state (% of plateau)
98%
Days to 90% plateau
28
A reference calculation based on an exponential decay formula — not a lab measurement and not medical advice.
Why does deca take so long to clear?
Because of its long ester: each injection keeps releasing active substance for a while, so full clearance after a cycle stretches into weeks rather than days.
When should PCT start after a deca cycle?
Because of the long half-life, PCT is usually delayed longer than after fast-ester cycles — the exact timing is better checked against your own accumulation chart than a generic rule of thumb.