Run your peptide & GLP protocols — with the science behind every dose.
Set the timing, titration and cycle once. PeptideBuddy reminds you when each dose is due, shows the exact units to draw, and models every compound's half-life so you always know what's active in your body right now — and it's completely free.
Educational tool. Not medical advice. Always consult a qualified clinician.
Plan it once. Check it off daily.
Build a protocol with per-day timing, week-by-week titration, and an on/off cycle. Each day you get a one-tap checklist — and an email when a dose is due. Doses record at their scheduled time, so your burn-down stays accurate even when you log late.
Today
Week 7 · Day 45Retatrutide
Titration
drag to shapeRamp the dose week by week — drag any point and the whole schedule reshapes.
Protocols & titration
Schedule doses by day and time, step them up week-by-week, and set a cycle — including repeating on/off cycles. A daily checklist tells you exactly what to take and how much to draw.
Reconstitution calculator
Enter vial strength and BAC water, and get the precise units to draw on a U-100 syringe, with a syringe visual. Solve for units, water or dose. Free — no account needed.
Half-life burn-down
A one-compartment PK model (absorption + first-order elimination) shows what's still circulating, projects when you'll clear, and reveals steady-state accumulation across compounds.
Single-vial stacks
Mix a blend like BPC-157 + TB-500 in one vial? Save it as a stack — PeptideBuddy sums the dose, draws one syringe, and still tracks each compound on its own elimination curve.
Supplements, not just peptides
A catalog of the supplements people stack with peptides and GLP-1s — creatine, magnesium, berberine and more — with half-lives and pairings. Log them, chart them, and build them into protocols.
Inventory & cost tracking
Log your vials and see how many doses are left, the date you'll run out, and your real cost per dose — for single compounds and whole stacks.
Body metrics & smart scale
Track weight and body composition, auto-import from a Renpho scale, and see your trend with each dose marked on it — so you can correlate dose changes with results.
Reminders on your schedule
Get an email when a scheduled dose is due — once per dose, never spammy — plus heads-ups before a titration step or your cycle-off date.
Private & secure
Sign in with email & password or a magic link. Your log is scoped to your account; nothing is public unless you choose to share it.
Stop guessing how many units to draw.
Reconstitution trips people up. Tell PeptideBuddy your vial strength and how much BAC water you added — it does the C = P/W math and shows the exact mark to draw to on an insulin syringe, no signup required.
Open the calculator- ✓ Solve for units, BAC water, or dose
- ✓ mg / mcg aware, with mixing-error guards
- ✓ Per-compound presets for common peptides
- ✓ Visual U-100 syringe — see the exact fill
Know when you'll run out — before you do.
Log your vials and PeptideBuddy works out what's left from your dosing: how many doses remain, the date you'll run dry, and your true cost per dose — for single compounds and whole stacks.
Track your stockRetatrutide
~24d leftBPC-157
~6d left- ✓ Save reusable blends with per-component doses
- ✓ One total dose, one syringe — drawn from a shared vial
- ✓ Independent half-life tracking per compound
- ✓ Drop a stack into a protocol and titrate the whole blend
Your blends, modeled correctly.
Most trackers treat a blend as one number. PeptideBuddy keeps each compound on its own elimination curve — because BPC-157 and TB-500 don't clear at the same rate — while logging, dosing and drawing the whole stack as a single shot.
Start stackingFree references — no signup needed
Half-lives, dosing and reconstitution for the compounds and supplements people actually run.