For education only · Not medical advice

Independent · Educational

What the peptide research actually shows.

A plain-English library on peptides: what each one is studied for, what people use it for, and where the evidence stops.

Start here

Two ways in, both plain-English.

01Reference · Most popular

2026's most popular peptides.

What each one is studied for, and what people actually use it for. We stopped averaging community dosing: too many variables, too easy to imply more certainty than exists. Where you see a dose, it's drawn from real personal experience; everywhere else, that field is left blank on purpose rather than filled with a guess.

Top of the list

  1. 01 BPC-157 Recovery
  2. 02 TB-500 Recovery
  3. 03 KLOW Recovery & skin
  4. 04 Semaglutide Metabolic
  5. 05 Retatrutide Metabolic
  6. 06 MOTS-c Metabolic
Open the field guide · 31 compounds
02Field notes · Research library

Peptides, explained.

What the peptide research actually shows, and where the gaps are. Evidence-first reads, from first principles to the compounds everyone argues about.

Latest

  1. Hormone Health Melanotan II: approved nowhere, and why regulators keep naming the melanotan peptide
  2. Hormone Health Tesamorelin vs Sermorelin: Same Target, Very Different Evidence
  3. Cognitive & Sleep DSIP for sleep: what happened when two other teams repeated the experiment
  4. Cognitive & Sleep Semax: what the Russian clinical work actually tested
  5. Foundations How to reconstitute peptides: the arithmetic, step by step
Browse all 57 articles

How it works

Every compound gets an evidence tier.

The tier is the first thing on each profile, so you can see what kind of evidence sits behind a compound before you read anything else.

Approved
A regulator has authorised it for a specific use.
Human trials
Published human studies exist.
Early human data
Small or preliminary human findings only.
Preclinical only
Lab and animal work, no established human evidence.

At a glance

Key facts about the library.

What it is
An independent research library on peptides, written in plain English.
Contents
31 compounds in the field guide, 22 compound profiles, 57 explainer articles, 6 head-to-head comparisons, a reconstitution calculator and a glossary.
Sources
Peer-reviewed papers, trial registries and regulatory documents, linked from each article.
What it is not
Not medical advice, not a shop, and not a source of dosing instructions.
New articles
Four a week, Monday to Thursday.
Contact
Use the contact form for corrections and questions.

Questions

Common questions, answered plainly.

What is Peptides 101?

An independent, plain-English research library on peptides: what each compound is studied for, what people report using it for, and where the evidence stops. It is for education only and is not medical advice.

Are the peptides on this site approved for human use?

It depends on the compound, and each profile says which. Some are approved medicines, some have human trial data, and many have only preclinical (lab or animal) data. Every profile carries one of four evidence tiers so you can see which is which.

What do the four evidence tiers mean?

Approved means a regulator has authorised it for a specific use. Human trials means published human studies exist. Early human data means small or preliminary human findings. Preclinical only means lab and animal work with no established human evidence.

Does Peptides 101 give dosing advice?

No. Where a source reports a figure, we say what it was and in what context. We do not tell anyone what to take. The calculator only converts a vial size and water volume into a syringe mark.

Who writes the articles, and where do the claims come from?

Articles are written from primary sources such as peer-reviewed papers, trial registries and regulatory documents, and link their sources so you can check them. See the About page for how we write and correct.