Peptide Tracker App: The Six Records Every Protocol Needs

What is a peptide tracker?

A peptide tracker is software that stores each injection you log, with the compound, the amount, the time, the injection site, and the vial it came from. From those entries it works out the next dose and how much supply is left. A generic pill reminder cannot do this, for three reasons. You usually mix a peptide vial yourself, so the app needs the vial size and the water volume to turn a dose into syringe units. Doses are often fractions of a milligram, so one misread mark changes the amount. And compounds differ in how much is known about them, so a useful tracker shows where its numbers come from. PepTrac is a peptide tracker for iPhone, published by Blanket LLC. It keeps one vial per compound, a weekly schedule across compounds, a site history, and a level estimate drawn as a range. It does not sell peptides.

What should a peptide tracker record?

A readable log needs six records: the dose, the vial, the syringe units, the schedule, the injection site, and the level estimate. The vial record matters most for safety, because it holds the date you mixed the vial. The FDA recommends discarding a multi-dose vial within 28 days after first use, even if medication remains, because contamination risk rises after that time.^[1] PepTrac stores that date but does not count down to the 28 days or flag a vial, so check the date yourself. The dose record builds the history and the streak. The schedule record produces today's checklist. The site record shows which areas you have used lately. The table below maps each record to what you enter and what PepTrac works out for you, so you can see which fields are typed by hand and which are derived.

How does a peptide tracker turn a vial into syringe units?

The conversion is three steps of arithmetic. First, concentration equals the milligrams in the vial divided by the milliliters of water added. Second, the volume to draw equals the dose divided by the concentration. Third, units on a U-100 insulin syringe equal the volume in milliliters multiplied by 100. As a worked example, a 5 mg vial mixed with 2 mL of water is 2.5 mg per mL. A 0.25 mg entry is then 0.1 mL, which reads as 10 units on a U-100 syringe and 4 units on a U-40 syringe, because U-40 has 40 units per milliliter. These numbers only illustrate the math and are not a dose recommendation. PepTrac stores the vial size and water volume once and shows the units every time a dose is due, so you do not redo the sum. Check each result against your product label and your prescriber's instructions.

The full method, with a live tool, is on the peptide reconstitution calculator page.

Can a tracker show how much peptide is in my body?

Only as an estimate. PepTrac models each logged dose with a one-compartment absorption curve built from the compound's half-life, then adds the doses together over time. The numbers are relative units, not a blood concentration, because the app does not know bioavailability or volume of distribution. The shaded band is a sensitivity range, made by rerunning the curve with the half-life and time to peak changed by 20 percent. It is not a statistical confidence interval. When a compound has no half-life on record, PepTrac draws no curve at all. The chart suits long half-life compounds. Semaglutide has a half-life of about one week,^[3] and one 0.25 mg entry reads 0.164 on day 7, with a range of 0.138 to 0.184. BPC-157 has a half-life under 30 minutes in animal studies,^[4] and a 0.25 mg entry reads 0.001 at 2 hours. The amount is an arithmetic example, not a dose recommendation.

Which peptides and GLP-1 medicines can I track?

You can add any compound you are recording. PepTrac's catalog lists a status for each entry, such as approved or primarily preclinical research, and a cited source for its half-life value. Semaglutide is an FDA-approved medicine sold as Ozempic and Wegovy, and its label gives the half-life used here.^[3] Tirzepatide also has FDA-approved products, but retatrutide does not: the FDA states that retatrutide has not been found safe and effective for any condition and cannot be used in compounding.^[1] BPC-157 and TB-500 are not FDA-approved either. As of October 2026, the FDA lists both among bulk substances that were nominated and then withdrawn, and it flags immunogenicity and impurity concerns for compounded versions.^[2] Most evidence on both comes from animal and lab studies. A tracker records what you enter and does not suggest that any compound is safe or useful. See the dedicated pages for BPC-157 and TB-500.

Is a peptide tracker medical advice?

No. A tracker records what you tell it and calculates from your numbers. PepTrac does not choose a dose, a schedule, a cycle length, or the next injection site, and its level curves are estimates, not lab results. Records and unit checks matter because mistakes happen. The FDA has received reports of patients measuring and self-administering incorrect doses of compounded semaglutide, and of health care professionals miscalculating doses, with some cases needing hospital care.^[1] A log that shows the vial, the water volume, and the units drawn gives you and your clinician something concrete to check against the product label. Bring questions about dose, side effects, or interactions to a licensed clinician or pharmacist, not to an app. PepTrac is educational record-keeping software from Blanket LLC. Its AI chat reads your own logs, and it can log a dose only after you confirm it.

What does PepTrac cost and where does it run?

PepTrac runs on iPhone only. It is not available for Android, iPad, or the web. The app is a free download, with an optional subscription called PepTrac Pro, and the current price is shown inside the app, so check it there before you decide. PepTrac is published by Blanket LLC and appears in the App Store as PepTrac: AI Peptide Companion. Beyond the six records above, the app includes a food log with an AI meal scan from a photo, water and weight entries, steps and calories from Apple Health, a workout tracker, and a data export. It does not sell peptides or send you to anyone who does. If you track several compounds at once, read the peptide stack tracker page. If you want to count on and off days, read the peptide cycle tracker page.