Guides
Guides for running a protocol.
Twelve plain-English guides covering the questions that come up between appointments: missed doses, titration counting, reconstitution math, storage windows, real cost per dose, and what to bring to a review. None of them tell you what dose to take.
Written by Nick Dillon, who builds Peptide Plug · How we source our figures
Problem guides
The questions people search for at the moment something goes wrong.
Math and reference guides
How the numbers work, explained without assuming a pharmacology background.
Tracking
Counting Weeks at Each GLP-1 Dose Step
Why GLP-1 medications escalate through dose steps, how the step sequences differ between products, and how to count weeks at a step accurately.
Reference
Reconstitution Basics: Vial to Syringe Units
How concentration, draw volume and syringe units relate, why the same dose reads differently on different syringes, and where the arithmetic goes wrong.
Reference
Half-Life, Explained Without the Maths Degree
What elimination half-life actually means, how it relates to the time between doses, what steady state is, and why an estimated curve is not a blood measurement.
Reference
TRT Injection Frequency: Weekly vs More Often
How injection frequency changes testosterone levels between doses, the arithmetic of splitting a weekly total, and what to track either way.
Practical guides
Storage, cost, sites, formats and appointments: the operational side.
Practical
What a Dose Actually Costs: Cost Per Dose Explained
Why cost per dose is not the price of the vial divided by the label, how it changes as you titrate, and how to work out your real monthly cost.
Practical
Storing and Travelling With Injectable Medication
How storage windows work, why an opened or reconstituted vial has two clocks, and what to plan for when travelling with injectable medication.
Practical
Injection Site Rotation: Why and How to Track It
Why site rotation is generally recommended for repeated subcutaneous injections, and how to keep a record that is actually useful.
Practical
HRT Formats Compared: Patch, Gel, Oral and Injection
How estradiol delivery formats differ in schedule and level stability, what changes when you switch between them, and what to record through a change.
Practical
Preparing for a Protocol Review Appointment
What to bring to a review appointment, which questions get asked, and how to turn months of tracking into something a clinician can use in ten minutes.
Educational content, not medical advice. These guides describe how people organise and track a protocol. They do not recommend a dose, a schedule or a product. Those decisions belong to you and a licensed clinician.
Tracking tool, not medical advice. Peptide Plug is an organization and calculation tool for adults 18 and older. It does not provide medical advice, diagnosis or treatment, and it does not recommend, suggest or verify any substance, amount, schedule or route. Calculators only perform arithmetic on the numbers you enter; double-check every result. Many compounds referenced on this site are not FDA-approved for human use, and products sold outside an approved supply chain are not verified for identity, purity or concentration. Peptide Plug does not sell, supply, source or link to sellers of any compound. Confirm every decision with a licensed clinician or pharmacist. In an emergency, call 911.