Keep a clear dose history
Pick the compound, confirm the amount, done. Your history builds itself as you go.
Your doses, clearly recorded.
Track GLP-1 and peptide doses, calculate reconstitution, and take a clear history to your next appointment.
Free calculators- No Peptisy account
- Records on your device
- Optional private iCloud
Today
Wednesday, Aug 12
This week
M
T
W
T
F
S
S
Last dose
Semaglutide, 0.4 mg
Log a dose
Semaglutide
Amount0.4 mg
SiteLeft thigh
Time7:45 AM
Recent
- Mon0.4 mg
- Last Wed0.4 mg
- Last Mon0.25 mg
Reconstitution
Vial5 mg
Water2 ml
Dose0.25 mg
Units to draw
10 units
10 of 100 units · U-100 syringe
Weight trend
Last 8 weeks
Start214 lb
Now198 lb
Change−16 lb
Dose days marked on the timeline below.
Doctor report
Jun 1 – Aug 11
Dose history summary
Semaglutide · 11 doses logged
Average interval: 7 days
Weight: 214 → 198 lb
Aug 50.4 mg
Jul 290.4 mg
Jul 220.4 mg
Illustrative preview · Fictional records
From your next dose to your next appointment.
Keep the details together: what you logged, what you calculated, and what you want to share.
Calculate units from your inputs
Enter vial strength and water added. Peptisy shows units to draw for your syringe.
Watch the trend, not just the number
View your weight entries alongside your dose history on a single chart.
Bring a plain report to your appointment
Export your dose history as a clear report to discuss with your healthcare professional.
Free calculators
Use the same math the app uses, free, in your browser. No sign-in required.
Reconstitution Calculator
Start from a vial amount and water added. Get concentration, volume, and units to draw.
Dose Calculator
Start from your dose. See exactly how many units to draw on a U-100 or U-40 syringe.
Semaglutide Dose Calculator
Reconstitution and units-to-draw math for a semaglutide vial and dose.
Tirzepatide Dose Calculator
Reconstitution and units-to-draw math for a tirzepatide vial and dose.
Peptide Dose Calculator
Unit-flexible reconstitution math in mg, mcg, or IU for any vial and dose.
BPC-157 Dose Calculator
Reconstitution and units-to-draw math for a BPC-157 vial and dose, with an mcg/mg toggle.
Retatrutide Dose Calculator
Reconstitution and units-to-draw math for a retatrutide vial and dose.
Peptide Half-Life Calculator
Enter a dose, half-life, and elapsed time to see the remaining amount and a decay curve.
Semaglutide Half-Life Calculator
Prefilled with the published semaglutide half-life. Edit it and see remaining amount over time.
Tirzepatide Half-Life Calculator
Prefilled with the published tirzepatide half-life. Edit it and see remaining amount over time.
Retatrutide Half-Life Calculator
Prefilled with the approximate reported retatrutide half-life. Retatrutide is investigational and not FDA-approved.
Why Peptisy
Verified dose records
Each dose write is read back and checked before Peptisy confirms it. JSON and CSV export are always included.
One subscription. Everything included.
One subscription includes every app feature. There are no feature tiers or later feature paywalls.
Private by architecture
Your dose records stay on your device. Optional sync uses your own private iCloud database.
Full reconstitution math
Supports mg, mcg, or IU and U-100 or U-40 syringes. The formula stays visible for the values you enter.
Your records stay yours.
Peptisy does not store your dose records on its own servers. Your dose log, vials, and reports stay on your device and sync only through your own iCloud, if you turn that on.
Frequently asked questions
What is Peptisy?
Peptisy is a dose log and reconstitution calculator for GLP-1 and peptide protocols. It logs your doses, calculates vial concentration and units to draw, and builds a plain report you can bring to an appointment.
How does the dose calculator work?
You enter a vial amount, the water you add, and your dose. Peptisy divides and multiplies the numbers you enter to show concentration, volume per dose, and units to draw. The formula is always shown on screen, and the calculator never recommends a dose.
Does Peptisy need an account?
No. Peptisy does not require an account or sign-in.
Where is my data stored?
On your device and, if you enable it, your own iCloud private database. Peptisy does not store your dose records on its own servers.
Do the free calculators on this site store or send my data anywhere?
No. The calculators on this site run in your browser. Nothing you enter is stored or sent to a server.
Which compounds can I track?
You define your own compounds and log doses against them. Built-in templates exist only for approved GLP-1 brands: Ozempic, Wegovy, Mounjaro, and Zepbound.
Does Peptisy send dose reminders?
Yes. You can set a reminder for each compound's dosing schedule.
Is exporting my data free?
Exporting your data is included with an active free trial, subscription, or lifetime purchase. There is no extra charge to export.
What languages does the app support?
The app interface is available in English, German, French, Spanish, Turkish, Brazilian Portuguese, and Italian.
Does Peptisy give medical advice?
No. Peptisy performs arithmetic on the numbers you enter. It does not recommend, adjust, or suggest a dose. Talk to your prescriber about your protocol.
Is Peptisy free?
The calculators on this site are free to use, with no sign-in required. The app includes a free trial, then paid access with a subscription or a one-time lifetime purchase.
Peptisy for iPhone
Log doses, track vials, and generate a report for your prescriber. Data stays on your device and your own iCloud.