Free tool, no signup

Free half-life check

Pick a compound. See how long it actually stays in your system, instead of guessing at it. Education only, no dosing, no sourcing.

Clearance curve Live
Dose every 7 days
Half-life
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Roughly cleared in
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How to read this: a climb to a flat plateau means it builds up to a steady level. Sharp spikes that drop to near zero mean it clears between doses. The gap between the peaks and the troughs is the swing, and the swing is what you actually feel. Roughly five half-lives to mostly clear after the last dose.

You modeled one compound. The tool models your whole stack.

This free check shows one compound on a slider. Here is what the full Half-Life Lab visualizer does that this cannot:

  • Stack and compare compounds on a single timeline, not one at a time.
  • Watch estradiol, prolactin and glucose rise right alongside the compound.
  • Read the peak-to-trough swing and the anabolic and androgenic load, live.
  • All 28 course modules and every badge, included.
See the full tool. Start your 7-day free trial
7 days free, then $39.99/mo or $399.99/yr. Card required, cancel anytime. 18+. Education only, never dosing or sourcing.

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A short, fact-checked weekly rundown of new peptide, PED and GLP-1 research and regulation, plus the one-page guide to reading a curve as a welcome. One email a week, science first, unsubscribe anytime.

No spam. 18+. Education only, never dosing or sourcing.
Half-Life Lab is an educational tool for pharmacokinetics and risk literacy. It models half-life and clearance curves only. It does not provide dosing instructions, protocols, sourcing, or where-to-buy information. You must be 18 or older. Nothing here is medical advice. Membership and payments are handled on Whop.