Select Peptide
Dose Frequency
Number of Doses
5 doses over 5.0 days
HGH (Somatropin)
Half-life: Approx. 2–3 hours (subcutaneous absorption phase); downstream IGF-1 effects persist ~12–15 hours (2.5h) · 5 doses every 24h
Peak after single dose
100% (normalized)
Steady state reached
~1 doses
Full clearance
~13h after last dose
Disclaimer: This visualization uses a simplified single-compartment pharmacokinetic model for educational purposes only. Actual blood concentration depends on many factors including bioavailability, volume of distribution, individual metabolism, and route of administration. Not medical advice.
About the HGH (Somatropin) half-life calculator
This HGH (Somatropin) half-life calculator visualizes how a single dose decays in your bloodstream over time and how multiple doses stack into a steady-state concentration. HGH (Somatropin) has a half-life of Approx. 2–3 hours (subcutaneous absorption phase); downstream IGF-1 effects persist ~12–15 hours, which means half of any given dose has cleared after that window. Adjust the dose interval (in hours) and the number of doses above to model your protocol.
Frequently asked questions
What is the half-life of HGH (Somatropin)?
HGH (Somatropin) has an approximate half-life of Approx. 2–3 hours (subcutaneous absorption phase); downstream IGF-1 effects persist ~12–15 hours. The half-life is the time it takes for half of an administered dose to clear your system, which determines how often you need to inject to maintain stable blood levels. Use the calculator above to plot your specific dosing schedule and see the predicted decay curve.
How often should I inject HGH (Somatropin)?
Injection frequency depends on HGH (Somatropin)'s half-life (Approx. 2–3 hours (subcutaneous absorption phase); downstream IGF-1 effects persist ~12–15 hours) and your protocol goal. The half-life calculator on this page lets you set a dose interval (in hours) and watch the resulting steady-state curve build up over multiple doses — useful for planning whether to dose daily, every-other-day, or weekly. Always consult a qualified healthcare provider before starting any protocol.
How do I reconstitute HGH (Somatropin)?
Reconstitution means dissolving the lyophilized (freeze-dried) HGH (Somatropin) powder in bacteriostatic water (BAC water) to make an injectable solution. The Peptides Calculator app handles the math: enter total mg, BAC water volume in mL, and desired dose, and it tells you how many units to draw on a U-100 insulin syringe.
Is the HGH (Somatropin) half-life calculator free?
Yes — every half-life calculator on Peptides Calculator is free, including this HGH (Somatropin)-specific page. No login required to view the decay curve or run scenarios.