Half-Life Visualizer

See how peptide concentration changes over time. Visualize single or multi-dose protocols and overlay peptides for stack analysis.

Disclaimer: This visualization uses simplified pharmacokinetic models with published half-life data. Actual concentration curves vary by individual and administration method. For informational purposes only.

Understanding Peptide Half-Lives

The half-life of a peptide is the time it takes for the concentration in your body to decrease by 50%. This is one of the most important pharmacokinetic properties because it determines how frequently you need to administer doses and how long the peptide remains active.

What Is Pharmacokinetics?

Pharmacokinetics (PK) is the study of how drugs and peptides move through your body — how they are absorbed, distributed, metabolized, and excreted (ADME). The concentration-time curve you see in our visualizer is a simplified representation of this process.

Short vs. Long Half-Lives

Short half-life peptides (minutes to a few hours) like DSIP, GHK-Cu, and CJC-1295 (no DAC) require more frequent dosing but provide pulsatile stimulation that can mimic natural physiological patterns. This is particularly important for growth hormone secretagogues.

Long half-life peptides (days) like Semaglutide, CJC-1295 (with DAC), and Tirzepatide provide sustained blood levels with less frequent injections. This improves convenience but means longer wash-out periods if side effects occur.

Multi-Dose Stacking

When you administer repeated doses before the previous dose has fully cleared, the concentrations "stack" — each new dose adds to the remaining level. This is particularly relevant for longer half-life peptides. Our visualizer shows this stacking effect, so you can see how concentration builds over multiple doses.

Time to Negligible Levels

It takes approximately 6–7 half-lives for a peptide to reach negligible levels (less than 1% of peak). For BPC-157 with a 4-hour half-life, this means about 28 hours. For Semaglutide with a 7-day half-life, it takes about 6–7 weeks. This is important to consider for drug testing, side effect management, and protocol transitions.

Factors That Affect Half-Life

Published half-life values are averages from study populations. Your individual half-life can vary based on metabolism, liver and kidney function, body composition, hydration, injection site, and concurrent medications. The values in our calculator represent typical averages for subcutaneous administration.