Origin & HistoryRead Post →
A Designation Is a Starting Gun, Not a Finish Line
Orphan designation gets read as a milestone reached. It is an incentive granted before the work is done, and thymosin alpha-1 shows the difference.
September 5, 2026
Notes and updates
Pure Peptides Blog
Notes from the bench and from the business: sourcing, testing, handling practice, and how we run a research peptide supplier.
For per-compound evidence reviews see the Research Hub, and for chemistry and handling references see the Reference Library.
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12Written for researchers, on sourcing, testing, handling practice, and how the store is run.
Origin & HistoryRead Post →
A Safety Reputation Doesn't Transfer Between Molecules, Even Close Ones
PT-141 and melanotan II get treated as near-enough the same thing. One is named on an FDA safety-risk list and one is not, and the split is documented.
September 5, 2026
Origin & HistoryRead Post →
Three Amino Acids Were Bolted On for One Reason: to Stop It Falling Apart
Selank is tuftsin, a fragment of an antibody, with three amino acids added at one end for a single stated purpose: to stop it degrading before it can act.
September 4, 2026
Origin & HistoryRead Post →
The Central Claim About These Peptides Is That They Touch DNA Directly
Almost everything in pharmacology starts by binding a receptor. The claim made for these peptides is that they skip that step and reach the gene itself.
September 3, 2026
Origin & HistoryRead Post →
DNSP-11 Comes From the Part of a Protein That Gets Thrown Away
A cell trims its proteins and discards the offcuts. DNSP-11 is eleven amino acids from one of those offcuts, and whether a living body makes it is an open question.
September 2, 2026
Origin & HistoryRead Post →
Every One of These Peptides Started as an Extract of the Organ It's Named After
The names record the organ each compound's original extract came from, and that origin is also the series' central scientific claim.
September 2, 2026
Origin & HistoryRead Post →
BPC-157 Was Built From a Protein Found in Human Stomach Fluid
The origin story everyone repeats about BPC-157 is close to right. The precise version is more interesting, and it changes how you read the whole literature.
August 30, 2026
Evidence & RigorRead Post →
Independent Researchers Ran Their Own Tesamorelin Trials and Looked at Something the Label Doesn't Cover
The trials that won tesamorelin its approval were sponsor-funded, as approval trials are. What happened next is the part worth paying attention to.
August 30, 2026
Discovery & MethodologyRead Post →
Thymosin Beta-4 Does Its Signature Job With Six Amino Acids
Thymosin beta-4 is 43 amino acids long. The part that binds actin is six of them, and working out which six is a small masterpiece of patient science.
August 30, 2026
Origin & HistoryRead Post →
GHK-Cu Was Found in Human Blood in 1973. Skin Had Nothing to Do With It.
The 1973 paper that introduced GHK had nothing to do with skin, or with copper. How a tripeptide from blood took fifteen years to become a matrix molecule.
August 29, 2026
Discovery & MethodologyRead Post →
MOTS-c Was Found Hiding Inside a Gene That Isn't Supposed to Code for Proteins
MOTS-c sits inside a mitochondrial gene whose job was never to make proteins. The discovery story, and what a sequence in a database does and doesn't prove.
August 29, 2026
Evidence & RigorRead Post →
GHK-Cu Is Blue for a Reason. Here's the Tell That Actually Proves It.
A convincing blue color is easy to fake. Here's the plain-English version of the two checks that actually prove GHK-Cu's copper is real.
August 29, 2026