Where to buy Kisspeptin-10 Peptide: sizes, price per mg and how to verify the lot

What "kisspeptin-10 peptide" names, and what it does not

Kisspeptin-10 is ten residues, Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe with an amidated C-terminus, written YNWNSFGLRF-NH2: the tail end of the 54-residue kisspeptin (also called metastin), and the shortest fragment that binds its receptor in the studies cited at the foot of this page. Formula C63H83N17O14, average mass 1,302.4 Da, PubChem CID 25240297. Listings write kisspeptin-10, kisspeptin 10, KP-10 and metastin (45-54); one molecule, provided the C-terminus is the amide, which is the detail this page keeps returning to.

The underlying biology is well described, which is a statement about the field and not about anything in a vial; no approved product contains this fragment, and this page makes no claim about what it does. What it can say precisely is the chemistry, and kisspeptin-10 has three features that decide how a certificate should be read: the C-terminal amide, two asparagines, and a tryptophan.

The amide is 1 Da lighter than the free acid, and the free-acid peptide is a different molecule that a careless synthesis produces; the asparagines deamidate, which also adds 1 Da and shifts retention time; and the tryptophan oxidises in light, adding 16 or 32 Da. So a certificate for this peptide is read to the dalton or it is not read at all, and a laboratory that prints 1,301.63 Da against a theoretical 1,301.63 has answered the question a rounded 1,302 leaves open. It is a small habit that separates laboratories that characterise a lot from ones that fill in a form.

The reference point for identity is public. PubChem lists Kisspeptin-10 as CID 25240297 with molecular formula C63H83N17O14, an average molecular weight of 1302.4 Da and a monoisotopic mass of 1301.631 Da. Those are the numbers a mass spectrometer is checked against, and the number a certificate must print beside the observed mass.

In plain terms: A man-made peptide ten building blocks long, the tail end of kisspeptin. No approved drug product contains this fragment. The underlying biology being well described is a statement about the field, not about anything in a vial.

Kisspeptin-10 for sale: sizes and price per mg

LabFirst lists Kisspeptin-10 in 2 sizes (5mg, 10mg) from $60 to $85, priced per vial with the per-mg figure beside it so sizes can be compared without arithmetic. Per mg, the 10mg vial is the cheapest at $8.50 and the 5mg the dearest at $12, which is the usual shape: the vial, stopper, seal, fill and laboratory run cost the same whatever mass goes in.

The volume tiers are per size, not per basket: ten vials of one size take 10% off that line and twenty take 15%, and mixed sizes do not combine. Shipping is a flat $15 on orders under $200 and free from $200, within the United States only, with same-day dispatch on orders placed before 12 PM Pacific on a business day. The cost per mg tool runs the same comparison across any two listings, ours or anyone else's.

Ten residues including a tryptophan and an amidated terminus make kisspeptin-10 a mid-priced synthesis, and the size table on this page has an unusual shape today: the 5 mg vial is cheaper per milligram than the 10 mg vial, which reflects the two lots' costs rather than any rule, and the per-milligram column rather than the vial price is what to compare. A laboratory qualifying a lot buys the 5 mg vial once and reads the mass to the dalton before buying more.

The price signal is the terminus. The free-acid peptide is easier to make and appears under the kisspeptin-10 name at lower prices; it is a different molecule, one dalton heavier, and only a certificate that reports the mass to the dalton with a retention time separates it from the amide. A steady price from a seller whose lots are tested outside is worth more than a discount from one whose are not. The only discounts on this page are the volume tiers, per size and unchanged month to month, and the lot on the vial is whatever the certificate index says on the day.

The certificate a Kisspeptin-10 lot must carry

Three tests answer three different questions, and a certificate of analysis for Kisspeptin-10 is only complete when it carries all three for the exact lot on the vial. Identity is settled by mass spectrometry, and the number to look for on a Kisspeptin-10 certificate is 1301.631 Da monoisotopic (or 1302.4 Da average, if the laboratory reports the deconvoluted average mass). The observed mass should sit within the instrument's stated tolerance of that figure, and the certificate should print both the theoretical and the observed value, not just a tick.

Purity is a separate question, answered by HPLC: how much of what came off the column was the compound. The figure is only interpretable with its method beside it (column, gradient, detection wavelength) and a date, which is what ICH Q2(R2) means when it asks that an analytical procedure be shown fit for its purpose. A percentage with no method and no date is a number somebody typed, and a certificate that carries every test but for a different lot number than the vial is the most common failure of all and the easiest to catch. Net content is the third test and the one most often missing: the milligrams of Kisspeptin-10 actually in the vial, measured, against the size printed on the label.

Identity is the observed mass against 1,301.631 Da monoisotopic (1,302.4 Da average), seen in electrospray as m/z 1,302.6 for the singly charged ion and 651.8 for the doubly charged, with theoretical and observed values printed to at least one decimal. One dalton high is either the free-acid C-terminus or a deamidated asparagine; the two are told apart by retention time and by the tandem mass spectrum, and a laboratory that has done that says so. Peaks at +16 and +32 Da are oxidised tryptophan. A certificate rounded to the nearest dalton has hidden the only differences that matter for this peptide.

Purity by HPLC should show the chromatogram with its column, gradient and wavelength; the tryptophan and tyrosine give a strong 280 nm signal, which is a useful second reading, and the deamidated forms elute slightly earlier than the parent on a good method. Net content is the third line: kisspeptin-10 is supplied as the acetate or trifluoroacetate, and with an arginine and a free N-terminus it carries counter-ion, so quantitative HPLC against a standard or amino acid analysis is what says how many of the labelled milligrams are peptide. The salt belongs beside that figure.

Where to buy Kisspeptin-10: five checks before you order from anyone

Every seller of kisspeptin-10 peptide says "third-party tested". The phrase costs nothing. These five checks take about four minutes per listing and separate a tested lot from a tested-sounding one.

1. The lot on the vial is the lot on the certificate. Read the printed lot number, then open the certificate and match it. A certificate for "Kisspeptin-10" with no lot, or a lot that does not match, describes some other vial.
2. The laboratory is named and has its own lookup. The report should come from a laboratory the seller does not own, with a search code you can enter on the laboratory's own site. LabFirst lots are tested by Freedom Diagnostics and looked up by accession number; anything that can only be verified on the seller's own page has not been verified.
3. The theoretical mass is printed, and it is the right one. For Kisspeptin-10 that is 1301.631 Da monoisotopic; a certificate that prints a different figure has either measured a different molecule or copied a template.
4. Purity has a method and a date. An HPLC percentage should name the method and the run date. A figure that reads "99%+" with neither, or one date reused across every product a seller lists, is decoration.
5. Net content is stated in milligrams. The label size is a claim; the certificate's net content is the measurement. If the certificate has no net content line, the purity figure describes the powder, not the vial, and the price per mg you calculated is fiction.

How listings for Kisspeptin-10 specifically mislead:

• A certificate with the mass rounded to 1,302. The free-acid peptide and a deamidated lot are each one dalton heavier than the amide; a rounded figure hides exactly the differences that matter.
• "Kisspeptin" sold as kisspeptin-10, or the reverse. Kisspeptin is the 54-residue protein at about 5.9 kDa; the fragment is ten residues at 1.3 kDa, and a certificate mass says which is in the vial.
• "99.5%" with no deamidation or oxidation peaks named. Two asparagines and a tryptophan age in known ways; a certificate that never sees those peaks may never have looked.
• "Pharmaceutical grade kisspeptin-10". There is no USP monograph and no approved product; the FDA placed Kisspeptin-10 in Category 2 of its 503A list in September 2023, so no pharmacy may compound it.

How to verify a LabFirst Kisspeptin-10 lot

The Kisspeptin-10 sizes in stock today carry lots LF-2608-14 and PO-1001-KS10. Lot LF-2608-14 is at Freedom Diagnostics on accession FD-2026-05716 for identity, purity and net content. Until the report is attached the product page says "pending verification" against that lot and makes no purity claim; the price stands and the report goes live the day it arrives, on the page, at /coa/, and inside the receipt and packing slip for every order of that lot.

Verification runs through the laboratory, not through us. Open the certificate index, find the lot, and use the accession number on the Freedom Diagnostics lookup page; the report you see there is the laboratory's copy, not ours. Each lot also carries a Finnrick verify link, and every receipt and packing slip states that a customer may submit a sealed vial to Finnrick's free testing programme with the order as proof of purchase, so the brand's public record is built from vials we did not choose.

The product page reads the live stock feed on load (stock, lot and certificate state for every size), so what you see when you order is what ships. The lot is printed on the label and encoded in the QR patch on its right-hand side; scanning it opens that lot's record.

Storage and shipping for Kisspeptin-10

Two asparagines and a tryptophan set the storage terms. Deamidation is slow in the sealed dry cake at 2 to 8 C and faster in solution, rising with pH and temperature; tryptophan oxidation follows light and air. So a prepared kisspeptin-10 solution is dated, kept cold and dark, and used inside the laboratory's own stability record rather than any figure on a label. There is no cysteine or methionine. The dry cake's other enemy is water drawn from humid air once the vial is opened; open a vial once, for its purpose, and never re-seal one for storage, because a cake that has absorbed moisture both weighs wrong and deamidates faster.

Orders ship within the United States, flat $15 under $200 and free above it, same day when placed before 12 PM Pacific on a business day, and the shipping page states the cutoff, the carriers and what is and is not promised.

The record a laboratory keeps on arrival is what makes the certificate usable later, and it is short:

• the lot number as printed on the vial, and the certificate's accession or search code beside it;
• the date received and the condition of the seal;
• the storage location and temperature it went into;
• the number of vials, and later the date each one was opened and by whom.

A Kisspeptin-10 vial with that record behind it can be traced from the bench to the laboratory report in one step; without it, the certificate is a document about a vial that can no longer be identified.

Regulatory status, and what this page is not

No approved medicine contains kisspeptin-10 and no USP or Ph. Eur. monograph defines an acceptable lot. In September 2023 the FDA placed Kisspeptin-10 in Category 2 of its interim list of bulk drug substances nominated for compounding under section 503A, the category for substances it has identified as raising significant safety risks, which bars licensed pharmacies from compounding with it. That listing concerns pharmacies, not laboratory material, and is quoted because "pharmacy grade" appears in listings for a substance no pharmacy may currently compound.

FOR LABORATORY AND IN-VITRO RESEARCH USE ONLY. NOT FOR HUMAN OR ANIMAL CONSUMPTION. LabFirst sells Kisspeptin-10 to laboratories and researchers as material for in-vitro work, gives no guidance on use, and ships only against that understanding. Nothing on this page or on the product page describes preparing or administering anything.

What is Kisspeptin-10 studied for?

Published research on Kisspeptin-10 investigates the areas below — which is a different question from what Kisspeptin-10 will do for anyone, a claim about a living system that nothing on this site is sold for.

What it is. A man-made peptide ten building blocks long, the tail end of kisspeptin.

What the research looks at. A substantial body of reproductive-hormone research covering the KISS1 receptor and brain-hormone signalling.

How it is thought to work. It works on the KISS1 receptor. Kisspeptin signalling is a well-described part of basic reproductive biology.

What is not established. No approved drug product contains this fragment. The underlying biology being well described is a statement about the field, not about anything in a vial.

The full record, including the certificate for the lot in stock, is on the Kisspeptin-10 product page.

Common questions

Sources

• PubChem, Kisspeptin-10, CID 25240297. Public record for the molecular formula (C63H83N17O14), average molecular weight (1302.4 Da) and monoisotopic mass (1301.631 Da) quoted here as the identity reference.
• Messager and colleagues, Kisspeptin directly stimulates gonadotropin-releasing hormone release via G protein-coupled receptor 54, Proceedings of the National Academy of Sciences 2005. Primary description of the compound in the literature; supports the class and naming stated here, not any use.
• Tena-Sempere, GPR54 and kisspeptin in reproduction, Human Reproduction Update 2006. Primary description of the compound in the literature; supports the class and naming stated here, not any use.
• Alliance for Pharmacy Compounding, 503A Categories Update, 29 September 2023 2023-09-29. Lists the substances the FDA moved to Category 2 on that date, including Kisspeptin-10.
• ICH Q2(R2), Validation of Analytical Procedures (2023) 2023-11. Why a purity figure is only interpretable with its method, and what "fit for purpose" means for the HPLC and mass spectrometry results a certificate reports.
• Freedom Diagnostics, certificate lookup by accession number. The laboratory-side lookup a LabFirst lot is verified on; the report there is the laboratory copy, not ours.
• Finnrick, verify a vendor or lot. Independent verification page linked from every LabFirst lot; customers may submit sealed vials with their order as proof of purchase.