Peak
Research & Tracking
Testosterone Cypionate Dose Tracker
Testosterone cypionate is a long-ester injectable whose concentration rises after each shot and decays over the following week, so what you actually experience depends as much on injection rhythm as on the weekly total. A written log of dose, date, time and site is what turns that into something you can reason about — and what turns a set of lab results into a trend rather than five disconnected numbers.
Peak keeps that record for you and draws the curve underneath it, so you can see where in the week a blood draw landed and whether a change to your split actually smoothed anything out.
Built around how cypionate is actually run
Ester-aware level curve
Your chart is drawn from the cypionate half-life and every dose you logged, so a 100 mg twice-weekly split and a 200 mg weekly shot look visibly different.
Split-dose schedules
Set weekly, 2×/week, 3×/week, EOD or a custom interval per compound. Next-dose timing comes from your last real injection, not a fixed weekday.
Automatic site rotation
Peak remembers your last site and suggests the next one in the rotation each time you log, with left/right tracking.
Trough-aware bloodwork
Photograph a lab report and Peak reads the values, then shows how many hours after your last injection the draw happened.
Reminders on the right day
Notifications fire on the day a compound is genuinely due at the time of day you choose — not a blanket daily nudge.
Vial and supply tracking
Log vial strength and volume once and Peak counts down remaining doses so a reorder never sneaks up on you.
Running peptides alongside your TRT? The reconstitution calculator works out bacteriostatic water volumes and units to draw, and the bloodwork tracker covers the lab side in more depth.
Log your first injection in under a minute
Add testosterone cypionate, pick your split, and Peak handles the timing, site rotation, level curve and reminders from there.
Works in any browser and installs to your iPhone home screen — no App Store download needed.
Testosterone cypionate tracking questions
How often is testosterone cypionate injected?
+
Cypionate has an ester half-life of roughly eight days, which is why once-weekly injecting is common. Many people split the same weekly total into two or three smaller injections because smaller, more frequent doses produce a flatter serum curve between peaks and troughs. Peak lets you set the schedule per compound — weekly, twice weekly, three times weekly, every other day or a custom interval — and calculates the next due date from your last logged injection rather than a fixed calendar day.
Should I track my trough or my peak levels?
+
Trough — the point immediately before your next injection — is the value most commonly used to judge whether a protocol is holding a steady level, because it is the lowest concentration you reach in the cycle. Peak timestamps every dose, so when you record a lab draw the app can show exactly how many hours after the previous injection it happened, which makes two results comparable instead of guesswork.
Why does injection site rotation matter?
+
Repeatedly injecting the same spot can lead to local irritation and scar tissue, which some people find changes absorption and comfort over time. Peak keeps a rotation list — delts, glutes, ventroglutes, quads — remembers which side you last used and suggests the next one when you log, so the pattern happens automatically rather than from memory.
What is the difference between cypionate and enanthate for tracking?
+
The two esters behave similarly but not identically: enanthate clears slightly faster than cypionate, so the same weekly dose reaches a marginally different trough. Peak models each ester with its own half-life when drawing your active-level curve, so switching esters visibly changes the chart instead of being treated as the same compound.
Can I log a dose I forgot to record yesterday?
+
Yes. Every log entry has a date and time field, so a back-dated injection slots into the correct place in your history and the active-level chart, streak and next-dose calculation all recompute around the real timestamp.
Peak is a personal logging and research tool. Nothing here is medical advice, a dosing recommendation, or a substitute for care from a licensed clinician.