OptiPin
Half-life visualizer
See how a compound rises, peaks, and clears — single dose or at steady state — using published half-life and time-to-peak values for 60+ compounds.
This web tool uses one shared one-compartment (Bateman) curve to illustrate timing. The OptiPin app runs more advanced, compound-specific models and personalizes them to you:
- Testosterone uses a saturation-then-decay absorption model calibrated per ester, layered on your endogenous baseline — then recalibrated to your bloodwork and converted to a free-testosterone estimate shown against reference ranges.
- Estradiol esters use a separate absorption-scaled model tuned to each formulation, also calibrated to your labs.
- Peptides, GLP-1s, and anabolics use compound-specific pharmacokinetics with evidence-quality flags, so weakly-characterized compounds are marked as estimates.
The app outputs personalized levels in real units; this page intentionally shows only relative shape and timing.
See your levels in the OptiPin app
OptiPin forecasts testosterone, estrogen, DHT, and GLP-1 levels from your actual logged doses and calibrates to your bloodwork — all on-device, no cloud required.
Download on the App StoreHow to read this
Half-life is the time for blood levels of a single dose to fall by half. A longer half-life means slower clearance and more accumulation with repeat dosing.
Steady state is reached after about 4–5 half-lives of regular dosing — that's when the amount you take each interval roughly equals the amount cleared. Levels then oscillate between a peak and trough. Shorter intervals relative to half-life produce a flatter curve.
Full clearance is the mirror image: after your last dose, a compound is effectively gone after about 5 half-lives (~97% eliminated). For a long ester this can be over a month; for a short one, days.