Guide
A weekly injection is easy to remember and hard to reason about. The half-life is about a week, so what is in you today is mostly last week's dose plus the one before it — which is why a titration step is felt days later, and why a skipped week does not feel like a skipped day.
Semaglutide is escalated on a schedule — typically four weeks at each step before the next — and the useful record is the ladder, not a list of injections. What you want to be able to answer three months in is “how long was I at 0.5 mg, and what happened during it”, which a flat dose log cannot tell you.
Plan the whole ramp once and let it run. In BioHack Track that is a titration phase per step, so the app knows which step today belongs to, when the next one is due, and can put the step changes on the same chart as your weight and side effects. If you want to sketch a ladder before committing to it, the GLP-1 titration planner lays out the dates and the volume per step in the browser, no download.
With a half-life near a week, one missed injection does not empty you out — roughly half of the last dose is still there seven days later, and a fraction of the one before it. The level falls, appetite suppression usually loosens, and it climbs back over the following couple of weeks once dosing resumes. Two or more missed weeks is the case worth flagging to your prescriber, because restarting at the dose you left off can be a rougher landing than the ramp was.
That curve is the reason a tracker should model the compound rather than list your entries. The semaglutide reference page has the half-life the model uses; the app decays every logged dose against it and shows what is still circulating.
Nausea, food noise, heartburn, fatigue — the pattern that matters is whether they spike in the days after a step up and settle before the next one. Logged as a daily score alongside the doses, that is a shape you can see; written in a notes app, it is not.
If a step is consistently rough for ten days and then fine, that is a different conversation with your prescriber than one that never settles.
Weekly, on the same day, in the same conditions. Daily weight on a GLP-1 mostly measures water and what you ate, and the noise is large enough to hide a real trend for a fortnight. A weekly point against the dose ladder is the chart that answers the question.
Your prescriber does not want your dose log. They want: the current step and how long you have been on it, the weight trend with dates, which side effects and how severe, and anything you missed. That is exactly what the provider record carries — and if they do not use the app, the doctor report is a PDF that says the same thing.
Yes. You enter the vial's own concentration, so a compounded vial in mg/mL is handled the same as a pen — the app works out the units to draw from the numbers on your vial, not from an assumption about the product.
Yes, including a switch part-way through. Each is its own protocol with its own ladder and its own half-life, and both land on the same weight and side-effect charts.
Log the actual day. The level model uses when you dosed, not when you meant to, so a Thursday shot logged on Thursday keeps the chart honest. Rescheduling a dose is a first-class action rather than a skip.
Yes. Dose logging, titration ladders, reminders, the levels chart and the compound library are all free with no history limit. Pro adds the outcome side — lab import, body composition, correlations and the doctor report.
For personal tracking. Not medical advice, and not a substitute for your prescriber.