Hexarelin Half-Life Calculator
Hexarelin is a hexapeptide growth hormone secretagogue whose research literature includes something most compounds in this class do not discuss: measurable desensitisation with continued administration. Its half-life is under an hour.
Half-life 55 min · peaks at 30 min
Every 24 hours.
Half-life
Left at next dose
Hexarelin · once daily · levels plateau after ~4.6 hours
Steady-state peak
1 mg
Steady-state trough
0 mg
Accumulation
None
At once daily, each dose has essentially cleared before the next one — levels don't accumulate, they repeat the same rise and fall. Clearance after a dose takes about 4.6 hours.
This is a modelled estimate of relative levels from published half-life and time-to-peak figures — not a measured blood concentration. Individual pharmacokinetics vary.
Based on a published Hexarelin half-life of about 55 min. The chart models RELATIVE levels from a unit dose — enter your own figures to see the shape. It is not a dose recommendation.
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What a 55 min half-life means in practice
A half-life of 55 min against once daily dosing means each dose has essentially cleared before the next arrives. That shapes the curve in three ways:
1. One half-life
Half the dose is gone after 55 min. After two half-lives 25% remains, after three 12.5%.
2. What's left at the next dose
Dosing once daily means the next dose lands 24 hours later, with about 0% of the previous one still present.
3. Accumulation and plateau
Almost nothing carries over, so levels don't accumulate — each dose repeats the same rise and fall, clearing in about 4.6 hours.
Worked example
Hexarelin has a half-life of 55 min. Dosing once daily, the next dose arrives 24 hours later with about 0% of the previous one still on board. That's little enough that levels don't build up: each dose rises and falls on its own, clearing in about 4.6 hours.
Desensitisation is documented for this one
The growth hormone response to hexarelin has been reported to diminish with continued administration in published work — a receptor-level adaptation to sustained stimulation. That is the mechanism cycling exists to address, and hexarelin is one of the few compounds in this space where it is described in the literature rather than assumed by analogy.
Its half-life is short, so the compound itself does not accumulate. Desensitisation is a separate matter from clearance — the molecule leaving does not mean the receptor has reset, which is exactly the distinction covered in the guide to cycling.
Frequently asked questions
This calculator is provided for informational and educational purposes only and is not medical advice. Always confirm dosing with a qualified healthcare professional and double-check your own measurements before administering anything.
Built by the Pep AI team.