# Semaglutide tracker for iPhone: units to draw, shot day and side effects in one place > Track compounded semaglutide from a vial: units-to-mg math, doses left, weekly shot countdown, rotation, nausea and weight. Peppy is free on iPhone. Source: https://peppytracker.com/trackers/semaglutide-tracker/ Last updated: 2026-08-30 Tracking compounded semaglutide means converting the mg your provider prescribed into units on an insulin syringe for your specific vial, remembering the weekly shot, rotating sites, and counting how many doses are left. Peppy does the units math from the vial concentration, counts down to shot day, suggests the next site on a body map, and estimates when the vial runs out. ## What tracking semaglutide actually involves A semaglutide tracker app has more to do for a compounded vial than for a brand pen. With [Ozempic](https://peppytracker.com/compounds/semaglutide-ozempic/) or [Wegovy](https://peppytracker.com/compounds/semaglutide-wegovy/) you click a pen to a number; with [Compounded Semaglutide](https://peppytracker.com/compounds/semaglutide-compounded/) you draw a volume out of a multi-dose vial with an insulin syringe, so your dose lives in _units_ and the conversion depends on the concentration your pharmacy filled. A 2.5 mg/mL vial and a 5 mg/mL vial give completely different unit counts for the same prescribed mg. The tracking job is therefore: the units for this vial, the weekly day, the site, and how many draws are left before you need a refill. Peppy's calculator sits inline in the protocol editor. Enter the mg in the vial and the mL of liquid it holds (or the mg/mL printed on the label), then your prescribed dose in mg, and it shows "Draw up N units" on a U-100 syringe. It warns when a dose will not fit in a 1 mL syringe. This is a unit conversion, not a recommendation; the mg comes from your provider. Try it here for compounded semaglutide: The [compounded semaglutide and tirzepatide units guide](https://peppytracker.com/guides/compounded-semaglutide-tirzepatide-units/) works through the math by hand if you want to check it, and the standalone [calculator](https://peppytracker.com/calculator/) is in the app's Calculator screen too. ## Shot day, rotation and missed doses Compounded semaglutide is the same molecule as the pens, and the pen labels name the abdomen, thigh and upper arm with instructions to rotate. Peppy's body map turns those regions into 13 sites and suggests the next one each time you log, with "last used 7 days ago" under it. If you also run a BPC-157 or another protocol, rotation is shared so two shots do not land on one spot in the same week. The [injection site rotation guide](https://peppytracker.com/guides/injection-site-rotation/) has the order. There is no compounded-product label to quote for missed doses, so people generally look to the brand labels and their provider: Ozempic's says a missed dose can be taken within 5 days and otherwise skipped, and Wegovy's frames it around whether the next dose is more than 2 days away. Peppy does not decide; it computes missed and overdue from your schedule, shows the hours elapsed on the Today tab, and lets you log late, skip, or add a past dose from the Calendar. The [missed GLP-1 dose guide](https://peppytracker.com/guides/missed-glp-1-dose/) compares the labels. ## Titration and step-ups Compounded semaglutide has no label ladder, so the catalog entry carries none; your provider writes the steps, often in units. Peppy's titration (Pro) takes whatever they wrote: a list of steps with a duration each. When a step ends, the units on the protocol card, in the reminder and on the log sheet advance together, and a marker appears on the weight chart. Because the dose is in units, re-run the calculator whenever the vial concentration changes, since 20 units of a new vial may not be the same mg as 20 units of the old one. ## Side effects and weight The daily check-in is the same for compounded and brand: weight, nausea, constipation, heartburn, sulfur burps and food noise scored 1 to 5, how you feel, and a note. Weight can come from Apple Health automatically, and every weigh-in you type is written back. Many people report [sulfur burps](https://peppytracker.com/side-effects/sulfur-burps/) and [nausea](https://peppytracker.com/side-effects/nausea/) in the first days after a shot; scoring them daily is what lets you see whether they fade as the weeks go on. The Progress tab (Pro) draws the weight trend with your goal and step-up markers, a side-effect heat-map lined up with shot days, and an adherence percentage. Export (Pro) turns it into a PDF or CSV for your provider, generated on the device. ## What's still active Semaglutide's elimination half-life is approximately one week according to the Ozempic prescribing information, and it stays in circulation for about five weeks after the last dose. Peppy uses the catalog half-life to draw an "Active in your system" curve that decays across the week and steps up when the next shot lands. It is an estimate, not a measurement, but it shows why a weekly schedule holds level and why a missed week appears as a dip. ## Frequently asked ### Is there a semaglutide tracker app for compounded vials? Yes. Peppy is a free iPhone semaglutide tracker app. Compounded semaglutide is in the catalog as a weekly vial dosed in units, so you enter the vial concentration and your dose, and Peppy shows the units to draw, counts down to shot day and logs each shot on a body map. ### How many units of semaglutide is my dose? It depends entirely on your vial's concentration. Peppy's calculator takes the mg per vial and the mL it holds (or the mg/mL on the label) plus your prescribed mg, and shows the units on a U-100 syringe. It is a unit conversion only; always verify with your prescriber. ### How do I remember my weekly semaglutide shot? Set your shot day in the protocol and the Today tab counts down. With Pro, Peppy sends a dose reminder and a missed-dose nudge, and the Next Shot widget on your Lock Screen logs the shot in one tap. ### Can the app tell me how many doses are left in my vial? Inventory (Pro) takes vials on hand and doses per vial, and shows a running count like 'about 4 doses left, runs out around Oct 3' with a running-low alert and a refill reminder. ### Does this work for Ozempic and Wegovy too? Those are brand pens dosed in mg with a label ladder, so they have their own pages: the Ozempic tracker and the Wegovy tracker. You can run a pen protocol and a compounded protocol in Peppy and switch between them. --- 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