Peptide Tracker
4.8 ★ 2,514 ratings · 70k people tracking

KNOW
WHAT’S IN
YOU, AND
WHEN.

Log every dose. See the estimated level between shots. Get the reconstitution maths right the first time. 127 peptides, referenced — and nothing leaves your phone.

Download on the App Store
Two weeks free
then $59.99 a year
The Today screen, showing three peptides with their estimated levels
01 · Today

TRACK

Every dose and level, in one place.

Two taps to log a shot: peptide, dose, site. The week strip shows what’s due, what’s done and what you skipped. Rotate injection sites without keeping a note in your phone.

Logging a dose, with the injection site map
The reconstitution calculator
02 · Calculator

DOSE

Without the guesswork.

Enter the vial strength, how much bacteriostatic water you added and which syringe you’re holding. The calculator gives you the unit mark to draw to.

Vial
10 mg
Water
2 mL
Dose
2 mg
Draw to
40 units
03 · Explore

LEARN

What each peptide actually does.

127 entries: mechanism, typical dosing, half-life, side effects, contraindications and regulatory status. Each one carries an evidence grade, so you can see whether the record is solid or thin before you commit.

The Tirzepatide reference page
The assistant answering a question about nausea timing
04 · Assistant

ASK

About your own protocol, not the internet’s.

The assistant already knows which peptides you run, the doses you take and when you last injected. Ask why the nausea peaks on day two, or what moving your shot to Friday would do.

Estimated level

The part between
the doses.

Every dose you log gets combined with the peptide’s published half-life to draw where the level sits right now — rising after a shot, falling before the next one. It’s a model, not a blood test, and it’s the fastest way to see the shape of your week.

Illustration · 1 mg weekly, 7-day half-life
Four weeks of a weekly shot, accumulating to a steady state
Estimated level
Week 1
One dose in, nothing behind it
Week 2
Second dose lands on a half-full tank
Week 3
Peaks climbing, troughs rising
Week 4
Roughly steady — twice the single-dose peak
The library

127 peptides, graded.

Nine categories, from fat loss to skin. The grade is our read on how strong the human evidence is — A for well-studied, F for don’t.

BPC-157
A
Healing · 250 mcg
Semaglutide
A-
Fat loss · 500 mcg
Tirzepatide
B+
Fat loss · 2.5 mg
Retatrutide
A-
Fat loss · 2 mg
TB-500
A-
Healing · 2 mg
Ipamorelin
B+
Growth hormone · 300 mcg
Epithalon
A
Anti-aging · 5 mg
GHK-Cu
A
Skin · 1 mg
Semax
A-
Cognitive · 600 mcg
Thymosin Alpha-1
A
Immune · 1.6 mg
Tesamorelin
B+
Growth hormone · 2 mg
MOTS-c
B-
Anti-aging · 5 mg
+ 115 more, searchable by name or brand.
4.8★
2,514 ratings
70k+
people tracking
14k/mo
doses logged
The estimated level chart is the part I did not expect to care about. Seeing it drop before a dose is what keeps me on schedule.
RTRob T.Down 24 lbs in 5 months
A year costs less than one vial I ruined by guessing. That maths took me about four seconds.
DLDana L.Week 14 · Semaglutide
I exported six months of doses for my doctor in one tap. She asked which app I use.
PNPriya N.Down 19 lbs

Questions

Where does my data live?
On your phone. There is no account and no server copy — if you delete the app, the log goes with it. Export to PDF before you do.
Is there a free version?
The first two weeks of your plan are free, with no card. Pro unlocks the rest of the schedule, the level charts and unlimited logging: $9.99 a week or $59.99 a year.
Is this medical advice?
No. Peptide Tracker is a logbook and a reference. It does not prescribe, diagnose or supply anything, and it does not replace a clinician.
Where does the library come from?
Published research and product labelling, summarised in plain language. Each entry carries an evidence grade so you can see how thin or solid the human record is.
How accurate is the estimated level?
It is a model built from the doses you log and the peptide’s published half-life, not a measurement of your blood. Treat it as the shape of your week, not a number to dose against.
Does the assistant see my log?
Your question and the relevant part of your protocol go to our server to generate the answer. We do not store either. The conversation is kept on your phone.
Can I show this to my doctor?
Yes. Doses, weights, side effects and photos export as a single PDF, any time.
Does it work offline?
Logging, the calculator and the library all work with no connection. Only the assistant needs one.

Start with
this week.

Answer a few questions, get a plan you can log against today. The first two weeks are free.

Download on the App Store
Not medical advice
Peptide Tracker is a logbook and a reference. It does not diagnose, prescribe, supply or verify anything, and it is not a substitute for a clinician. Many peptides described in the library are not approved for human use in the United States. Talk to a doctor before you start or change a protocol.
Peptide Tracker© 2026