Glossary
The words behind the record.
- GLP-1
- Glucagon-like peptide-1, a gut hormone involved in blood sugar regulation and appetite. “GLP-1s” colloquially means GLP-1 receptor agonist medications such as semaglutide, and related dual-agonists such as tirzepatide, prescribed for diabetes or weight management. PepTrak records GLP-1 protocol schedules and dose logs; see the GLP-1 tracker page.
- Half-life
- The time it takes for the amount of a compound in the body to fall by half. Published elimination half-lives come from a drug's prescribing information; for example, FDA labeling lists approximately one week for semaglutide and approximately five days for tirzepatide. Half-lives drive PepTrak's Estimated Peptide Levels; the methodology page explains the model and cites the labels.
- Steady state
- The plateau reached when regular dosing and elimination balance out, so the amount in the body stops climbing dose to dose. As a rule of thumb in pharmacokinetics, steady state arrives after roughly four to five half-lives of consistent dosing.
- Titration
- The stepwise adjustment of a dose over time (commonly upward from a starting dose) following a schedule set by a prescriber and the drug's labeling. Titration decisions are clinical decisions; a logbook only records them.
- Subcutaneous injection
- An injection into the fatty tissue just under the skin, the route used by most GLP-1 and peptide protocols. Often abbreviated “subq” or “SC.”
- Injection site rotation
- The practice of varying where injections are given (such as abdomen, thigh, or upper arm) across doses, commonly advised to reduce skin irritation. A dated record of sites makes rotation visible. PepTrak logs an injection site with each dose, so the rotation history is part of the record.
- Protocol
- The plan being tracked: which compound, what dose, what cadence, which day and time, and the current status. A protocol is distinct from its history; the plan can change while the dated log remains.
- Stack
- Two or more protocols run concurrently. Tracking a stack means keeping each compound's schedule, doses, and supply distinct while seeing the whole picture in one place. The Stack screen shows every compound's cadence, dose, site, week, and vial balance; see the peptide tracker page.
- Reconstitution
- Mixing a freeze-dried (lyophilized) compound with a diluent to prepare it for use. The term appears throughout peptide tracking because vial contents and concentrations determine how doses are measured and logged.
- Vial
- The container a compound comes in. Vial tracking ties supply to the dose log: how much remains, when it was started, and the context behind each refill.
- Dose log
- A dated record of doses taken or skipped, ideally with time, site, and notes. A complete dose log lets you review a protocol later instead of trying to remember it.
- Local-first
- A software design in which your device is the primary home of your data: records are created, stored, and read on the device itself rather than on a vendor's server behind an account. PepTrak stores protocol records in on-device SQLite; the private tracking guide covers why that matters.