GHRP-2 Half-Life Calculator
GHRP-2 is a growth hormone releasing peptide acting at the ghrelin receptor. Its half-life is under an hour, producing a sharp pulse and complete clearance well before any realistic next administration.
Half-life 33 min · peaks at 25 min
Every 24 hours.
Half-life
Left at next dose
GHRP-2 · once daily · levels plateau after ~2.8 hours
Steady-state peak
0.93 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 2.8 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 GHRP-2 half-life of about 33 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 33 min half-life means in practice
A half-life of 33 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 33 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 2.8 hours.
Worked example
GHRP-2 has a half-life of 33 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 2.8 hours.
Potent, but not selective
GHRP-2 is among the more potent growth hormone releasing peptides for its class, but potency at the intended output does not come alone. Ghrelin receptor activation also influences cortisol and prolactin, and GHRP-2 is not selective in the way ipamorelin is reported to be — the additional effects come with it.
Its very short half-life means it functions as a pulse generator rather than a sustained presence. That is consistent with how growth hormone is physiologically released, and it means the accumulation question simply does not arise at any interval people use.
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.