For TRT Users
Most TRT protocols have five compounds. One app should track all of them.
Testosterone twice weekly. Anastrozole on shot days. HCG three times a week. A peptide stack on top of that. By month three, the mental overhead of keeping it all straight is significant.
Protocol logs every compound in your protocol with its own schedule, dose, and vial. PK curves show you when Testosterone peaks and troughs relative to your ancillary timing. Injection site rotation prevents the buildup that comes from years of intramuscular injections in the same spots.
81
compounds in the research library
6
Stack Score dimensions
Zero
accounts or cloud sync
Track every compound in one place
Protocol tracks each compound separately — its own vial, its own schedule, its own dose log. When you open the app, you see the full picture: what you took today, what is due tomorrow, what is running low.
Base
Testosterone Cypionate
2x weekly
Base
Testosterone Enanthate
2x weekly
Base
Testosterone Propionate
EOD
Ancillary
Anastrozole
With shots
Ancillary
Enclomiphene
Daily
Ancillary
HCG / Gonadorelin
3x weekly
Peptide
BPC-157
Daily
Peptide
TB-500
2x weekly
PK curves and Active Levels
The timing of ancillaries relative to Testosterone peaks matters. Anastrozole works best when estrogen is rising, which is when Testosterone is in the early phase of its half-life. If you are injecting Testosterone Cypionate on Monday and Thursday, the peak lands around 24-48 hours after each shot.
Protocol's PK curve modeler plots this for you. Enter your Testosterone ester, dose, and injection days — the chart shows the blood concentration curve for each injection and the cumulative Active Level over time. Add Anastrozole and it appears on the same timeline.
Most TRT tracking apps log doses. Protocol shows you the pharmacology underneath the schedule so you can make better decisions about timing.
Injection site rotation for long-term TRT
Two injections per week for five years is 520 injections. If you default to the same two or three sites because they feel familiar, you will develop scar tissue and lipohypertrophy that changes how Testosterone absorbs.
Protocol's 3D body map tracks 8 injection zones with tissue-rest color coding. Green means the zone has had adequate rest. Orange means it was used recently. Red means it was used today. The map tells you where to inject next without requiring you to remember the last seven injections.
For TRT users adding subcutaneous injections — smaller doses, more frequent — the abdomen and outer thigh zones track separately from the intramuscular sites, so you can rotate across both methods.
Stack Score for TRT and peptide combinations
Adding peptides to a TRT protocol is common. BPC-157 and TB-500 for tissue repair. Growth hormone peptides for sleep and body composition. Selank or Semax for cognitive function. Each addition changes the risk and interaction profile of the stack.
Stack Score evaluates your full protocol across six dimensions: synergy between compounds, redundancy (doubling up effects), side effect risk, evidence quality for each compound, cost per week, and overall complexity. The score updates when you add or remove compounds.
The Interaction Checker flags combinations that have documented interactions or that warrant additional attention. It is not a medical opinion — it is a research tool that surfaces information before you make decisions.
TRT data stays on your phone
Protocol does not require an account, collect an email, or sync to a cloud server. Your dose logs, injection history, and compound library are stored on-device in SQLite. Nothing leaves your phone.
Stealth Mode replaces the Protocol app icon with a generic shield. For users who prefer that TRT use not be visible to a colleague or family member who picks up their phone, it is available on iOS and Android.
Free to download. Free to track.
Core features are free. Every install gets 14 days of Pro. No credit card at signup.
Frequently asked questions
Can Protocol track TRT and ancillaries together?+
Yes. Protocol tracks multiple compounds in a single protocol. A typical TRT stack might include Testosterone Cypionate twice weekly, Anastrozole on injection days, and HCG three times per week. All three log separately with their own schedules, doses, and vials, and appear together on the timeline so you can see the full picture at once.
Does Protocol have pharmacokinetic curves for Testosterone?+
Yes. Protocol Pro includes a PK curve modeler that charts blood concentration levels over time for Testosterone Cypionate, Testosterone Enanthate, and Testosterone Propionate based on your dose and injection frequency. The Active Levels view shows all compounds in your stack on one timeline, including when Testosterone peaks and troughs relative to your ancillary schedule.
Is Protocol useful for someone on a TRT and peptide combination?+
This is one of Protocol's strongest use cases. TRT-plus-peptide stacks — typically Testosterone plus BPC-157, TB-500, or growth hormone peptides — involve multiple compounds with different dosing schedules, injection frequencies, and reconstitution requirements. Protocol manages all of them: dose logging, vial tracking, injection site rotation, reconstitution math, and a Stack Score that evaluates the combination across six dimensions.
What injection sites does Protocol track for TRT?+
Protocol's 3D injection site tracker covers 8 zones: left and right ventroglute, left and right outer thigh, left and right shoulder (deltoid), and left and right upper glute. For TRT users doing intramuscular injections, these are the primary rotation sites. The map shows recency with color coding so you always know which zone has had the most rest.
Is Protocol private? I don't want TRT data in a cloud.+
Protocol stores all data on-device with no account creation and no cloud sync. Your TRT logs, dose history, and compound library never leave your phone. Stealth Mode replaces the Protocol app icon with a generic shield so the app is not identifiable on your home screen.
What does Stack Score do for a TRT protocol?+
Stack Score analyzes your full protocol across six dimensions: synergy (do these compounds work well together), redundancy (are you doubling up unnecessarily), side effect risk, evidence quality, cost efficiency, and stack complexity. For a TRT user adding peptides, it flags combinations that may be redundant or that warrant more attention and gives you a structured way to evaluate changes before making them.