The PUŪRA Journal · 14 articles

Peptide research education, in plain English.

What each compound is, what has been studied, and where the evidence is still developing. Every article ends with what the research actually supports.

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Quality & Handling · 5 min read

How to Read a Peptide Certificate of Analysis, Line by Line

A line-by-line guide to a research peptide certificate of analysis: what LC-MS, RP-HPLC, net peptide content, LAL endotoxin and heavy-metals results actually show, and the red flags that mean the certificate is not worth the PDF it came in.

Quality & Handling · 6 min

What "Third-Party Tested" Actually Means for Peptides

Quality & Handling · 5 min

How to Choose a Research Peptide Supplier in 2026: A 10-Point Checklist

Regulation · 5 min

The FDA "Peptide Ban" of 2026: What Actually Happened

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Tissue Research · 6 min

BPC-157 and TB-500: Why Researchers Study Them Together, and What the Research Actually Says

BPC-157 and TB-500 are among the most commonly paired research peptides. A plain-English guide to what each one is, why the pairing makes mechanistic sense, and what the published research does and does not cover.

September 28, 2026

GH Secretagogues · 6 min

The Big 3 GH Secretagogues: What Really Sets Sermorelin, Tesamorelin and Ipamorelin Apart

Sermorelin, tesamorelin and ipamorelin all act on growth hormone release, but through two different receptors and with very different evidence behind them. A plain-English comparison of structure, mechanism and regulatory history.

September 27, 2026

Neuro Research · 6 min

Semax vs Selank: The Main Differences Between These Cognitive Research Peptides, and What the Research Says

Semax and Selank were designed in the same Moscow institute with the same stabilizing tail, then pointed at different systems in the brain. A plain-English comparison of origin, structure, mechanism and evidence.

September 25, 2026

Free kit · 3 guides · 23 pages

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Peptides 101, The Peptide Short List and The Assurance Checklist, in one email.

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Hormone Research · 6 min

Peptide research education, in plain English.

How to Read a Peptide Certificate of Analysis, Line by Line

What "Third-Party Tested" Actually Means for Peptides

How to Choose a Research Peptide Supplier in 2026: A 10-Point Checklist

The FDA "Peptide Ban" of 2026: What Actually Happened

BPC-157 and TB-500: Why Researchers Study Them Together, and What the Research Actually Says

The Big 3 GH Secretagogues: What Really Sets Sermorelin, Tesamorelin and Ipamorelin Apart

Semax vs Selank: The Main Differences Between These Cognitive Research Peptides, and What the Research Says

Go deeper with three complimentary guides.

Why Do People Call Kisspeptin the "Sex Drive" Peptide? Here's What the Research Found

Peptide Blends Like GLOW and KLOW: Does pH Balance Matter?

MOTS-c vs SS-31: Two Mitochondrial Peptides, Two Very Different Jobs

Why Mitochondria Matter, and the Peptides Researchers Study Them With

What Does "Triple Agonist" Mean? A Plain-English Guide

Why Is Copper Peptide (GHK-Cu) Everywhere Right Now?

How to Store Lyophilized Peptides: Stability, Shelf Life, and the Cold-Chain Myth