Peptide Half-Life Decay Visualizer
Pick any combination of peptides — see what's still active in your system on one shared timeline.
📊 Half-Life Decay Viz
Overlay multiple peptides on the same timeline. See exactly when CJC-1295 is still active while Ipamorelin has worn off — or what's still circulating from last week's tirzepatide.
Frequently asked questions
What is a peptide's half-life?+
Half-life (t½) is the time it takes for plasma concentration to fall to 50% of its peak. After 5 half-lives, ~97% has been eliminated. For peptides this typically ranges from minutes (DSIP, sermorelin, CJC-1295 without DAC) to days (semaglutide, tirzepatide, retatrutide).
Why is plasma half-life different from effect duration?+
Many peptides act on receptors or downstream pathways that persist long after plasma clearance. DSIP and Epitalon have minute-scale plasma t½ but cycled effect over days. MT-II's plasma t½ is ~33 hours but pigment effect outlasts. The chart shows plasma decay, not effect.
How do I use the multi-peptide overlay?+
Add two or more peptides — say CJC-1295 (no DAC, 30-min t½) and Ipamorelin (2-hr t½) — and watch the curves diverge. By hour 4, CJC is ~3% but Ipamorelin is still ~25%. This is why the GH stack is dosed at the same moment.
What's the difference between CJC-1295 with DAC and without?+
Without DAC: ~30 min plasma half-life — pulse dose. With DAC (drug affinity complex): ~6–8 day half-life — once-weekly. The chart includes both for direct comparison.
Educational use only
This calculator is provided for research and educational purposes. Outputs are derived from the values you enter. Always verify your math and consult a licensed physician before acting on any result.