Build My Peptide Protocol

Tell us about you and what you're working on. We map your situation to how the compounds actually work and hand back a tailored starting protocol from the Targeted Peptide Systems framework.

First time here? — two minutes, and it explains why it recommends what it recommends.

Where the dosing lives

Every dose in this Builder is drawn from Targeted Peptide Systems. Already own the book? Look your compounds up as you go — the Builder tells you exactly which ones you need. Prefer them right here? The Dosing Upgrade puts them in the app, labelled Low / Moderate / High and matched to your experience level.

Get the Book

Important This builder is an educational companion to the Targeted Peptide Systems book. Any dosing shown reflects the reference ranges published in that book and is not medical advice, diagnosis, or treatment. Many compounds referenced are research peptides not approved for these uses. Always consult a qualified healthcare professional before considering any protocol.

1About You

Basic context for tailoring.

Biological Sex

Experience

Age

Body Weight

175

Body Type

Endo

Stores fat easily

Meso

Athletic build

Ecto

Lean, hard gainer

Evidence Preference

Where you want the Builder to sit between the longest clinical track record and the newest compounds. This changes what it suggests first — never what you're allowed to pick.

Established

Longest track record

Balanced

Weigh both

Newer

Open to emerging

2What's Going On

Tick everything that applies, in plain terms. We translate this into the right pathways for you — you don't need to know the systems.

3Already Using Anything?

Optional. Tell us what you're already on and the Builder works around it — it won't hand you a second compound doing the same job.

4Cycle

Shapes the timing language only, not dosing.

Duration

Phase

Fill in your details and tick what's going on,
then we'll build a tailored starting protocol for you.

What the Protocol Builder is

The Builder is an implementation tool. It takes the decision framework, compound hierarchy and protocol logic from Targeted Peptide Systems and applies them to your specific situation, so you don't have to hold the whole framework in your head while you plan.

You describe your situation in plain language. The Builder translates that into the physiological pathways involved, ranks them, and assembles a starting protocol that follows the book's logic — then shows you its reasoning at every step.

What it is not. It is not a replacement for the book, and it is not medical advice. It does not diagnose anything, it cannot see your bloodwork, and it does not know your history. It applies a framework — the judgment stays with you and your clinician.

The book is the primary resource. The book carries the scientific foundation, the reasoning behind every recommendation, and the progression logic. The Builder organises and applies that knowledge. If you ever want to know why the Builder did something, the answer is in the book.

The order matters

Protocol design runs in a specific sequence, and the Builder follows it. Each step narrows the one after it — which is why the Builder asks for context before it names a single compound.

Your objective. What you actually want to change. Everything downstream is judged against this.
Your situation. The plain-language concerns you tick. You never have to name a system or pathway — that is the Builder's job.
The target pathway. The Builder derives which physiological systems your concerns point at, then ranks them into a primary, a secondary, and sometimes a third.
Your experience level. Sets the starting point for how conservative the defaults are.
What you're already on. So the Builder works around it rather than duplicating it.
Established versus newer. Where you want to sit between the longest clinical track record and the newest options.

Only once all six are set does the Builder generate anything.

Why the compounds appear in that order

Compounds are not listed alphabetically or by popularity. They are ranked by how well each one serves your top-priority pathway, adjusted for your experience level, your body type, your evidence preference, and any safety flags your inputs raised.

The first compound shown is your primary driver — the one doing the main work. The recommended pairing beneath it is the compound that best complements that driver, favouring combinations with an established track record together. Everything below that is a genuine alternative, not filler.

It validates, it does not just populate

The Builder is a protocol validation engine. As you build, it is continuously checking for:

Two compounds hitting the same receptor family — one GHRH, one GHRP, one incretin per cycle
Duplicate pathway targeting, where a second compound adds variables but not effect
A blend that already contains a compound you've selected separately
Compounds your own inputs flagged as a caution — these get steered away from automatically
Overall complexity, and whether it has passed the point where you could interpret the result

If a compound un-ticks itself when you tick another, that is the redundancy check working, not a fault. The Builder tells you exactly what it swapped and why, every time.

Use the minimum number of compounds necessary

This is the single most important principle in the book, and the Builder is built around it.

More compounds do not produce better outcomes. They produce more variables. Every compound you add is one more thing that could be responsible for a result — good or bad — and one more thing you cannot separate out.

Why simpler wins

You can actually evaluate it. With two compounds and a clear response, you know what worked. With six, you have a result and no explanation.
Side effects are attributable. If something feels wrong on a simple protocol, you know where to look.
It is cheaper and easier to run. Fewer injections, less to time, less to source.
You build a baseline. Establish what a compound does for you before you start layering. That baseline is worth more later than a fast start is worth now.

Add a compound when you have a reason, not a hope. A new compound should be answering a specific question the framework raised — not added because it might help. If you cannot say what it is for in one sentence, it is not ready to go in.

The Builder shows you a simplicity reading as you select. If it starts warning you, that is not the tool being restrictive — it is telling you the protocol has passed the point where you could interpret the outcome.

Experience and knowledge are not the same thing

You can have never used a peptide and still have read deeply, understood the mechanisms, and worked through the book's reasoning. If that is you, you are not a Beginner in the sense that matters here.

Your level is a statement about how confident you are applying the book's logic — not a count of how many compounds you have run. Choose accordingly.

Ask yourself

Have you used peptide protocols before?
Do you understand how these compounds work — the mechanism, not just the effect?
Can you follow the reasoning in the book and see why one compound is chosen over another?
Do you prefer established compounds with long-term data, or are you deliberately choosing newer ones for reasons you can articulate?
If the Builder recommended something and you disagreed, could you say why?

What each level actually changes

Level	How the Builder behaves
Beginner	Leads with the strongest-evidence compounds, starts you with two, limits stacking, and prioritises proven outcomes over theoretical upside. Learning before optimising.
Intermediate	More flexibility and additional optimisation options, starting with three. Still checks for redundancy, still recommends the simpler protocol where one exists.
Advanced	Full customisation, newer compounds surfaced, sequencing left in your hands. Redundancy checking stays on — it is validation, not a restriction.

Beginner mode is a feature, not a limitation. It is the fastest route to knowing what a compound does for your body, which is the foundation everything else is built on.

Nothing is locked at any level. Every compound in the database is selectable no matter what you choose here. Your level sets the defaults, not your permissions.

Recommendations are defaults, not rules

Every compound the Builder puts in front of you is a starting point that reflects the book's logic applied to your inputs. You can change any of it.

The default recommendation reflects the most established clinical evidence — not necessarily the newest or potentially most effective option.

A worked example

For metabolic pathway work, a Beginner default leans toward semaglutide. Not because it is the most powerful option available, but because it has the longest clinical history and the largest body of long-term safety data. That is what "default" means here.

An informed user who has read the framework and understands the tradeoff may deliberately choose retatrutide instead — newer, less long-term data, different mechanism profile. That is a legitimate decision when it is an informed one, and the Builder will build the protocol around it and keep validating the rest.

The difference between those two users is not permission. It is whether they can explain the choice.

Strength and evidence are two different things

On the metabolic and fat-loss pathway, every compound carries two labels: how much it does, and how much long-term human data stands behind it. They are not the same measure and the Builder no longer treats them as if they were.

The list is ordered by effect size — strongest first. So retatrutide and tirzepatide sit above semaglutide, because on fat loss that is genuinely the order. What changes with your experience level is only which one is pre-ticked for you, and the Builder tells you outright when it has held your default back from something stronger sitting right there in the list.

If you set your evidence preference to Established, effect size stops leading and the longest track record does. That is the setting doing exactly what it says.

How to override

Set your experience level and evidence preference honestly — these shape what the Builder offers first.
Tick any compound you want, in any lane. Nothing is locked.
If your pick sits above your stated level, the Builder flags it as an intentional override and explains the tradeoff. It does not stop you.
Watch the redundancy and simplicity checks — they keep running on your custom protocol exactly as they do on the default one.

Advanced mode never turns off validation. It gives you more room inside the framework. The checking is the part that protects you, at every level.

Where the dosing lives

The Builder tells you which compounds, in what order, on what timing framework, and what to monitor. Actual amounts come from Targeted Peptide Systems.

That is deliberate. Dosing without the reasoning around it is the most dangerous way to use this information — the book gives you the context that makes a number meaningful.

Own the book? Look up each compound the Builder names as you go.
Want them in the app? The Dosing Upgrade shows the book's ranges here, labelled Low / Moderate / High, with the tier matching your experience level highlighted as a starting point.
Any purchase code — book, Tracker or bundle — also removes the free-run limit.

Always confirm with a qualified healthcare professional before acting on any protocol. Many compounds referenced here are research peptides not approved for these uses.

Want the long version?

The full written guide, with worked examples, lives on the website.

Read the complete guide →