Where a spreadsheet holds up
Let's be honest about what spreadsheets do well. If you are running a simple, weekly, single-peptide protocol and you already live in Excel or Google Sheets, you can absolutely run your tracking there. A basic log with columns for Date · Peptide · Dose · Site · Notes takes five minutes to set up and solves most of the problem.
Spreadsheets are also unbeatable for retrospective analysis. If you already have six months of well-structured data, a pivot table reveals trends that most apps cannot. Nothing on this page argues against that.
Where it quietly breaks
Reconstitution math each vial
When you open a new vial, you need to know: mg in vial × BAC water volume ÷ desired dose = units on syringe. Spreadsheets can do this — if you build the formula once, keep it synced across tabs, and remember to update it each time the vial size changes. In practice, people do this once, then stop updating it, then dose wrong six weeks later. Peptide Protocol recomputes automatically when you change vial or dose (and the free web reconstitution calculator does the same if you only want the math).
Injection site rotation
A spreadsheet can log which site you injected in, but it cannot tell you which site is ready today vs still cooling down. For daily peptides, this matters for avoiding lipohypertrophy. Peptide Protocol shows a live body map with cooldown state; a spreadsheet shows a list you have to mentally cross-reference.
Reminders
Spreadsheets do not notify you. You either set a separate phone reminder (which then drifts from your actual log) or you miss doses. The tightest spreadsheet setups we have seen rely on Google Calendar integrations that break quietly whenever the protocol changes.
Titration across multi-week cycles
GLP-1 titration (semaglutide 0.25 → 0.5 → 1.0 → 1.7 → 2.4 mg) is hard to track in a spreadsheet. You need current dose, scheduled step-up date, prior response, and cooldown between steps. Every spreadsheet we have seen trying to do this becomes a fragile mess within two titration cycles.
Multiple peptides on different cadences
One weekly peptide: spreadsheet is fine. Two peptides — one weekly, one daily, one every-other-day — and the spreadsheet loses 20% of your actual doses because the cognitive load shifts from logging to scheduling.
Feature-by-feature
| Feature | Peptide Protocol | Spreadsheet |
|---|---|---|
| Initial setup time | ~2 min | 5–30 min (formula debugging) |
| Reconstitution math | Auto per vial | Manual formulas |
| Dose reminders | Push notifications | None (needs external calendar) |
| Site rotation with cooldown | Live body map | Manual, often stale |
| Inventory / vial runway | Refill alerts | Manual count |
| Side-effect correlation | Auto-correlated | Pivot table (if you build it) |
| Multi-peptide scheduling | First-class | Degrades quickly beyond 1–2 |
| Titration tracking | Dose-step history | Error-prone |
| Privacy | Local-first, iCloud sync | Depends on spreadsheet backend |
| Ownership of data | Export any time | Yours by default |
| Cost | Freemium | Free |
When the spreadsheet is the right call
Stay with a spreadsheet if…
You run one peptide, once a week, with no titration and no site rotation concerns. You already live in Sheets or Excel. You value retrospective pivot-table analysis above daily logging.
Try Peptide Protocol if…
You run 2+ peptides, inject more than once a week, titrate doses, rotate sites, or you have missed more than one dose this month because the spreadsheet did not remind you.
Free tools you can use without switching
Even if you stay with a spreadsheet, you do not have to do the math yourself:
- Reconstitution calculator — mg + BAC water + dose → units. Shareable URL.
- Dose converter — mcg ↔ mg ↔ IU with peptide-specific IU ratios.
- Half-life visualizer — plot plasma concentration over time.
All free, no account required. Paste the answers into your spreadsheet.