Half-Life & Plasma Concentration Tracker
Peptides don't disappear instantly. Use this pharmacokinetic simulator to visualize how your doses accumulate in your bloodstream over time based on the compound's specific half-life.
Plasma Concentration Tracker
Simulate pharmacokinetics (drug accumulation and decay) over 5 weeks to visualize your trough and peak blood levels.
Understanding the Graph
This chart uses exponential decay (`N(t) = N0 * e^(-λt)`) to simulate active compound mass in your body. Notice how a weekly injection of a long half-life compound like Semaglutide causes the baseline "trough" to stack higher and higher each week, while a short half-life compound like BPC-157 drops almost to zero before the next dose.
The Danger of Stacking: Half-Lives Explained
The "half-life" of a compound is the time it takes for exactly 50% of the active substance to be cleared from your system.
For extremely short half-life peptides like BPC-157 (4 hours), the compound is almost entirely cleared from your body within a day. This is why it requires daily or twice-daily injections to maintain active plasma levels.
Conversely, GLP-1 agonists like Semaglutide (168 hours / 7 days) have a half-life identical to their injection frequency. When you take your second weekly dose, 50% of the previous week's dose is still in your system. This creates a "staircase effect" where your active plasma levels climb higher for 4-5 weeks until they reach a steady state. This is why jumping immediately to a high dose causes severe nausea.