The six things worth recording
Ranked by how much you regret not having them.
- Reconstitution details — vial amount and volume of liquid added, per vial. This determines concentration, and without it every unit figure you recorded is meaningless. It is the single most commonly omitted item.
- Each administration — date and time. Timing is what makes any level projection or interval question answerable.
- Injection site — which region and roughly where within it. Without this, rotation is guesswork and lipohypertrophy creeps up unseen.
- Vial state — when it was reconstituted and how much remains. Both clocks that end a vial depend on this.
- Observations — what you noticed, dated. Ideally in a consistent form, because free text a month apart is not comparable with itself.
- Everything else that changed — training, sleep, other compounds, life. Attribution is impossible without it, and this is what makes a record retrospectively useful rather than merely complete.
Why spreadsheets fail
A spreadsheet is excellent at storing rows and terrible at three things this task requires.
It does not compute. Reconstitution arithmetic has to be redone by hand every time the vial changes, which means it gets redone hastily or from memory. It has no sense of time — nothing reminds you, nothing tells you the vial is nearly empty, nothing notices you skipped a day. And it has no spatial model, so injection sites become a text column that nobody reads back and rotation becomes fiction.
The compounding problem is friction. Every one of those gaps adds a small manual step, and small manual steps at the moment of logging are exactly what erodes a habit. The record does not fail all at once; it degrades, the gaps grow, and eventually the file stops being opened.
What a record has to survive
The test of any system is whether it can answer a question you did not anticipate asking. Six months in, the questions that actually come up are things like: what was different about the period when this worked? How long was the gap between the last cycle and this one? Have I been favouring one injection region without noticing? Which vial was this from, and how was it mixed?
None of those are answerable from a log of dates and amounts. They need the context recorded alongside — the reconstitution details, the sites, the concurrent changes — and they need it recorded consistently enough to compare across months. That is the actual design requirement, and it is why the discipline is in what you record rather than how diligently you record it.
Key takeaways
- Reconstitution details are the most commonly omitted and most damaging omission — without them, no other number means anything.
- Spreadsheets fail because they cannot compute, cannot track time, and have no model of injection sites.
- Log what else changed. Attribution is impossible without it, and it is the part that makes a record worth keeping.
- The test of a record is whether it answers a question you had not thought to ask when you started it.
Stop keeping this in your head.
Pep AI keeps your compounds, vials, schedule, injection sites and history in one place — and does the reconstitution math for you. Free on iOS and Android.
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This guide is general information for people already organising their own protocol. It is not medical advice, it does not recommend any compound or dose, and Pep AI is not a medical device. Talk to a qualified healthcare professional about anything you inject.
Published by the Pep AI team · Updated August 2026