Peptilex – The Peptide Encyclopedia
- 34 peptides – from semaglutide to BPC-157 – in one book
- An evidence grade (A–E) and the key studies for every peptide
- Where each one stands in 2026 – US, EU and Switzerland
What's inside
- Part I – FoundationsWhat peptides are, how they act, why everyone is talking about them, how to read a study, and the rules in the US, EU and Switzerland.
- Part II – The Lexicon34 profiles, from semaglutide, tirzepatide and retatrutide to BPC-157, TB-500, GHK-Cu, MOTS-c and epitalon – each with key studies and a Peptilex evidence grade from A to E.
- Part III – PracticeSport and anti-doping, travel, how to talk with your doctor, how to judge new claims, and what comes next.
- AppendixEvidence overview of all 34 peptides, name finder (Ozempic, Zepbound, PT-141 …), glossary, sources and a doctor-conversation worksheet.
The 34 peptides in this book
Every profile has its own page on this site.
Weight & metabolism
Healing & recovery
Skin & beauty
Longevity & mitochondria
Immune system
Brain & mood
Hormones & growth
A look inside: the landmark results
TreatmentPlacebo
RetatrutideTRIUMPH-1 · 80 wk¹
25.0%
3.9%
TirzepatideSURMOUNT-1 · 72 wk¹
20.9%
3.1%
CagriSemaREDEFINE 1 · 68 wk
20.4%
3.0%
SemaglutideSTEP 1 · 68 wk
14.9%
2.4%
¹ Highest-level treatment group. Different trials, durations and populations – not a head-to-head comparison.
Sources: TRIUMPH-1 · NEJM 2026 · SURMOUNT-1 · NEJM 2022 · REDEFINE 1 · NEJM 2025 · STEP 1 · NEJM 2021
| Average weight loss in landmark trials | Trial | Treatment | Placebo |
|---|---|---|---|
| Retatrutide | TRIUMPH-1 | 25.0% | 3.9% |
| Tirzepatide | SURMOUNT-1 | 20.9% | 3.1% |
| CagriSema | REDEFINE 1 | 20.4% | 3.0% |
| Semaglutide | STEP 1 | 14.9% | 2.4% |
| GLP-1 | GIP | Glucagon | Amylin | |
|---|---|---|---|---|
| Liraglutide1× | ||||
| Semaglutide1× | ||||
| Tirzepatide2× | ||||
| Retatrutide3× | ||||
| CagriSema2× |
Source: Peptilex 1, profile overview (type of each peptide)
Questions
Is this medical advice?
No. Peptilex explains research for education. Talk to a doctor before any health decision.
Which format should I choose?
Kindle for instant reading on any device; paperback or hardcover if you like to mark pages – the content is the same.
Does the book stay current?
The book reflects the research as of September 2026. The free study tracker on this site follows new studies every week.
Also available
German editionPeptilex – Das Peptid-LexikonThe German edition: 34 peptides, what they do, the key research results and their status in Germany, Austria and Switzerland.Details
Coming soonPeptilex – The Honest GLP-1 HandbookSemaglutide, tirzepatide and the new pills, explained for adults over 50.