Timing changes everything.
A compound that clears in eight hours needs a completely different record from one that takes five weeks. These pages cover half-life, activity window, and what each timescale means for keeping a log that is actually worth reading later. Organization only — no dosing or medical advice.
Browse by category
Compounds in the same category tend to share a timescale, and the timescale is what shapes the log.
GLP-1
The longest half-lives here. Levels accumulate for over a month before flattening.
Browse → 1.5–2 hrHealing & recovery
Clear within a working day, but with cited activity windows far longer than that.
Browse → 30 min – 8 daysGrowth hormone
The widest spread on the site — two compounds share a name and differ 384-fold.
Browse →BPC-157
One of the shortest half-lives in the catalogue. Clears within a working day, so nothing carries over — and the clock time you log matters as much as the date.
Read reference → Healing · 2 hrTB-500
A 2-hour half-life against a 48-hour activity window — the clearest case of why half-life alone is a misleading number to track against.
Read reference → GLP-1 · 7 daysSemaglutide
Roughly 35 days to clear, so levels accumulate for over a month before flattening. Also known as Ozempic, Wegovy, and Rybelsus.
Read reference → GLP-1 · 5 daysTirzepatide
Clears in about 25 days against semaglutide's 35, reaching steady state faster. Also known as Mounjaro and Zepbound.
Read reference → Growth hormone · 8 daysCJC-1295 with DAC
The longest half-life in the catalogue — longer than semaglutide. Levels build for weeks, and a missed entry stays visible for over a month.
Read reference → Growth hormone · 30 minCJC-1295 No DAC
The shortest half-life on the site, and roughly 384× shorter than the DAC version people call by the same name.
Read reference → Growth hormone · 2 hrIpamorelin
Short-acting and pulsatile. Clears within half a day, so the clock time on an entry carries most of the information.
Read reference → Growth hormone · 24 hrMK-677
Oral, and not actually a peptide. No vial, no syringe math — but a 24-hour half-life means consecutive days overlap.
Read reference → Sexual health · 2.7 hrPT-141
Activity window roughly four times the half-life, and typically used situationally rather than on a cadence.
Read reference → Longevity · 1 hrGHK-Cu
Used both topically and injected, which are not comparable records. Vials run 50–100 mg, ten times most peptides.
Read reference →One log, every compound
PepTrack keeps separate schedules, reminders, and histories for each entry, and draws estimated levels using these same half-life figures. Free on iPhone, no account required.
Download on the App Store