What is KPV peptide? The Lys-Pro-Val tripeptide

KPV is a peptide of three amino acids, lysine, proline and valine, and it is the last three residues of alpha-melanocyte-stimulating hormone. At 353.42 g/mol it is the smallest molecule in the catalog, light enough that a 10 mg vial holds about 28 micromoles of it.

KPV is sold on its own as a lyophilized 10 mg vial and also appears inside two blends, where three letters are easy to miss on a four-peptide label. This guide covers what the molecule is built from, the numbers on its identity sheet, how its size changes the arithmetic at the bench, where it is sold in Canada, and what its lab report should show.

What KPV is made of

Three residues, in that order: lysine, proline, valine. The name is the one-letter code for each of them, and that is the whole molecule. Nothing is attached at either end, which keeps it light.

Alpha-MSH is a melanocortin hormone, and KPV is the tail of it. That places the fragment in the same family as the melanotan peptides, though researchers work with the tripeptide as its own molecule rather than as a stand-in for the full hormone. The catalog lists it as studied in inflammation, gut and immunology research.

TB-500 is the other peptide that shares a blend listing with KPV, and the two are unrelated. TB-500 is a 4963.44 g/mol peptide from thymosin beta-4, and the short piece of it sold separately is fragment 17-23. The two are compared side by side.

The smallest peptide in the catalog

Size is the defining feature of this molecule, and it changes every number you calculate from the label.

A 10 mg vial is about 28.3 micromoles, because 10 mg divided by 353.42 g/mol gives that figure directly. The same mass of a 4,000 g/mol peptide comes to roughly 2.5 micromoles, so the two vials hold molecule counts that differ by a factor of more than ten.

If your work is in molar units, that difference decides how much material a vial represents. The reconstitution calculator carries a preset for KPV, and the KPV handling guide puts the concentration table beside the storage rules for the same vial.

Is KPV available in Canada?

Yes. KPV is supplied in Canada as a research chemical for in-vitro laboratory use, not as a drug, a supplement or a consumer health product, and it is not approved by Health Canada for any use in people or animals. A 10 mg lyophilized vial is $44.99, and it ships free to any Canadian address from a domestic supplier, dispatched the same business day an e-Transfer clears.

Buying it in Canada is the straightforward part. What the research-use-only category means, and what a buyer agrees to by ordering under it, is covered in are research peptides legal in Canada.

KPV in blends

KPV is one of the few peptides in the catalog that is sold both alone and as a blend component. Both routes are in stock.

A blend label states one combined mass, so the 60 mg on the KPV + GHK-Cu vial counts both peptides together rather than the KPV amount, and the 80 mg on KLOW is shared across four molecules. Each component is tested on its own, so the report for a blend carries a line per peptide and the KPV figure for a given vial sits there. How much GHK-Cu is in KLOW works through that label arithmetic on the same KLOW vial, and what a peptide blend is covers the format itself.

The practical difference between one combined vial and separate ones is the ratio. A blend fixes it at fill, while single vials leave it adjustable and give each peptide its own report. Peptide blends vs single vials sets out that trade-off.

What KPV's lab report should show

At 353.42 g/mol the identity check on KPV is unusually clean, because the expected mass is small and a mass spectrometer resolves it precisely. Four things belong on the report:

• Observed mass near 353.42 g/mol, printed next to the expected value
• HPLC purity at 99% or higher, which is the release spec every batch has to meet before it ships
• A batch number that matches the code on the vial in your hand
• A named, independent lab, with the test date on the document

Colour is no help with KPV the way it is with the copper blends: a KPV solution is clear and colourless, and that tells you nothing about whether the vial passed. The report is the check. Every pepuro vial carries a QR code that opens the third-party report for its own batch, and any batch code can be typed into the tracking page as well.

Every KPV vial from pepuro ships free, from our Calgary, Toronto and Vancouver distribution centers, the same business day your e-Transfer clears, with a QR code on the vial that opens its independent, third-party lab report.

For research use only. Not for human or animal consumption.