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Peptide Blogged — Peptides, read carefully

Safety and sourcing2 min

Storing and Handling Peptides Correctly

Peptides degrade through hydrolysis, oxidation and freeze-thaw cycling. Storage temperature and reconstitution choices decide how fast.

By Fergus Kirkbride ·

Safety and sourcing3 min

Third-Party Testing and What a COA Proves

HPLC purity and mass spectrometry answer different questions. A certificate showing only one of them leaves the important one open.

Compounds3 min

BPC-157: What the Evidence Actually Shows

A pentadecapeptide with three decades of rodent studies, no completed human trials, and a regulatory status that surprises most people.

Fundamentals3 min

What Peptides Actually Are

A peptide is a short chain of amino acids. That one definition covers insulin, several approved drugs, and most of what gets sold online.

Looking up a specific peptide?

Plain-English guides to 19 of them. Each one says up front whether it is a medicine you can actually be prescribed, or something sold online that has never been tested in people.

Approved medicineStrong human evidence

Semaglutide

Also called Ozempic, Wegovy, Rybelsus

The weekly injection behind Ozempic and Wegovy. It reduces appetite, and in trials people lost around 15% of their body weight.

Weight and appetite

Research onlyNo human trials

BPC-157

Also called Body Protection Compound 157, Pentadecapeptide BPC 157

The most talked-about healing peptide online. Thirty years of promising rat studies, and not one completed human trial to show for it.

Recovery and injury

Used in skincareMixed human evidence

GHK-Cu

Also called Copper peptide, Copper tripeptide-1

The blue copper peptide in serums. One of the few skincare peptides with real human studies behind the firmness and fine-line claims.

Skin and hair

Browse all peptidesWeight and appetite · Recovery and injury · Skin and hair · Hormones and growth · Sex and libido · Sleep, mood and focus · Longevity

Sections

Fundamentals

What peptides actually are, how they are administered, and the vocabulary you need before anything else on this site makes sense.

Reading the research

How to tell a promising human trial from a mouse study with a press release. Study design, sample sizes, and the failure modes of peptide research specifically.

Compounds

Individual peptides, one at a time: what the evidence supports, what it does not, and where the gaps are.

Safety and sourcing

Purity, storage, contamination, and the regulatory status that determines what you can actually verify about a vial.