The PUŪRA Journal · 32 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.
Tissue Research · 10 articles
Tissue Research · 3 min
GHK vs GHK-Cu vs AHK-Cu: What's the Difference?
GHK vs GHK-Cu vs AHK-Cu: one swapped amino acid and one copper ion apart. Here's how they differ, with each molecular weight side by side.
October 29, 2026Tissue Research · 3 min
Why Is GHK-Cu Blue? What the Color Tells You, and What It Can't
Why is GHK-Cu blue? It's the copper. Here's what the color proves about a copper peptide vial, and what it can never tell you.
October 28, 2026Tissue Research · 3 min
What Is KPV? The Three-Amino-Acid Tail of Alpha-MSH
What is KPV? Three amino acids snipped off the end of the hormone alpha-MSH, and the short list of what it's actually been studied in.
October 11, 2026Tissue Research · 3 min
What Is TB-500? Where the Name Came From and What's Actually Been Studied
What is TB-500? A nickname from horse racing, not an official drug name. Here's the molecule it usually means and what's actually been studied.
October 11, 2026Tissue Research · 3 min
What Is BPC-157? Where It Came From and What's Actually Been Studied
What is BPC-157? A 15-amino-acid fragment from a 1993 stomach-protein paper. Most of its research comes from one lab, and the human data is tiny.
October 11, 2026Tissue Research · 3 min
TB-500 vs Thymosin Beta-4: The Main Differences Between the Fragment and the Parent Peptide, and What the Research Says
TB-500 gets sold as thymosin beta-4. Usually it's a piece under a fifth the size. One number, its weight, tells them apart.
October 4, 2026Tissue Research · 3 min
Three-Peptide vs Four-Peptide Blends: What's in Each, and the One Difference
The four-peptide blend isn't a stronger three-peptide blend. It's the same GHK-Cu, BPC-157 and TB-500 plus KPV. Here's what's in each vial, by the milligram.
October 3, 2026Tissue Research · 3 min
BPC-157 and TB-500: Why Researchers Study Them Together, and What the Research Actually Says
BPC-157 and TB-500 get sold as a pair. For decades nobody ran a controlled test of them together. Then a 2026 rat study did. Here's what it found.
September 28, 2026Tissue Research · 3 min
Peptide Blends: Does pH Balance Matter?
Does pH matter in peptide blends? Yes, but it's locked in before the vial is sealed. Here's what you can actually check instead.
September 23, 2026Tissue Research · 5 min
What Is GHK-Cu? The Copper Peptide, Explained Simply
What is GHK-Cu? A three-amino-acid peptide holding one copper ion, first found in human blood in 1973. How it was studied and its FDA status in 2026.
September 19, 2026Peptide of the Week
One peptide a week, explained by Dr. Jade Teta, ND
Every Thursday, Dr. Teta, a member of our Scientific Advisory Board, writes a one-page monograph on one research compound: where it came from, what researchers are studying, and how strong the evidence is. It’s free.
By Dr. Jade Teta, ND
PUŪRA Scientific Advisory Board
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