# Histrelin: track every shot and what's still active

> As needed schedule, site rotation and half-life chart for Histrelin. Track it in Peppy, private on your iPhone.

Source: https://peppytracker.com/compounds/histrelin/
Last updated: 2026-09-02

GnRH agonist implant branded as Supprelin LA (pediatric) and Vantas (adult); FDA-approved for central precocious puberty and advanced prostate cancer as a year-long implant. In the Peppy catalog, Histrelin is a pre-mixed injection, dosed in mg, typically as needed, with a listed half-life of about 52.1 weeks.

## Frequently asked

### How long does Histrelin stay in your system?

The Peppy catalog lists a half-life of about 52.1 weeks for Histrelin. After roughly five half-lives, about 260.7 weeks, most of a single dose has cleared. That is an estimate from the half-life, not a measurement, and individual clearance varies.

### Can I track Histrelin in Peppy?

Yes. Histrelin is one of 123 compounds built into Peppy, with its form, unit and typical frequency prefilled. Add it as a protocol, set your schedule, and Peppy handles the countdown, the log and the reminders (Pro).

### Where should I inject Histrelin?

Follow your prescriber's instructions. For subcutaneous shots the GLP-1 labels list the abdomen, thigh and upper arm and say to rotate. Peppy's body map has 13 sites, suggests the next one, and shows when each was last used. Read the [site rotation guide](https://peppytracker.com/guides/injection-site-rotation/).

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Peppy is a tracking tool, not medical advice. Dose calculations are mathematical conversions only. Always follow your prescriber's instructions and verify every draw-up yourself.

Peppy is a free iPhone app (Pro subscription optional). App Store: https://apps.apple.com/us/app/peptide-tracker-peppy/id6775005514