KPV frequently asked questions
Answers about KPV, how it is tested, how to read and verify its certificates, ordering, and KPV Labs. Figures update automatically from the current lot data.
Last updated
Product
What is KPV?
KPV is a synthetic tripeptide. KPV Labs supplies it as a lyophilized powder in 10 mg vials, with an independent certificate of analysis for every lot.
What is KPV research material?
KPV research material is KPV supplied for laboratory research, sold by lot, with each lot's identity, purity and net content documented by an independent laboratory in a published certificate of analysis.
What is the molecular formula and weight of KPV?
The molecular formula is C16H30N4O4 and the average molecular weight is 342.43 g/mol. The peptide has 3 residues.
How should KPV be stored?
Store sealed, dry and protected from light at the temperature stated on the vial label. Allow a cold vial to reach room temperature before opening.
Where does the KPV sequence come from?
It is residues 11–13 of α-melanocyte-stimulating hormone (α-MSH), the C-terminal end of that 13-residue peptide.
Is KPV amidated?
No. The KPV supplied here is the free acid, Lys-Pro-Val-OH, C16H30N4O4, 342.43 g/mol.
Testing and quality
How is KPV analyzed?
KPV is analyzed with complementary methods: HPLC-UV for purity, HPLC-RTM for identity, a quantitative measurement for net content, and, where listed, LAL endotoxin and PCR microbial testing. Results are published per lot at kpv.bio/coa/.
Who tests KPV?
Every lot is tested by ILS Laboratories, an independent third-party analytical laboratory. KPV Labs does not test its own material for published certificates.
What purity does KPV test at?
Current lots report HPLC-UV purity 99.69%, against a stated release specification of ≥95%. The most recent result is 99.69% for lot KB-96378.
How is the identity of KPV confirmed?
By HPLC retention-time comparison with a reference standard (HPLC-RTM), performed by ILS Laboratories on every lot. The laboratory runs the sample and a reference standard of the named compound under the same HPLC conditions; identity is confirmed when the main peak elutes at the reference standard’s retention time.
Is KPV tested for endotoxin?
Endotoxin and microbial testing are reported per lot. Every lot page in the COA archive states whether those tests were performed.
What is HPLC testing, and what does the purity percentage mean?
HPLC (high-performance liquid chromatography) separates a sample's components so each appears as a peak. The purity percentage is the main peak's share of all UV-detected peak area. It does not confirm identity (the separate HPLC-RTM test does) or measure the amount of peptide in the vial (net content does).
Certificates of analysis
What is a KPV COA?
A KPV certificate of analysis is the testing laboratory's report for one lot: the lot number, test dates, methods and results for purity, identity and net content. KPV Labs publishes every lot's COA as a readable page at kpv.bio/coa/.
Where can I find the COA for my vial?
Find the lot number printed on your vial label and enter it at kpv.bio/verify/, or open that lot in the COA archive at kpv.bio/coa/.
How do I confirm a COA with the laboratory?
Go to portal.ils-lab.com (or scan the QR code on the certificate) and enter the lot's verification access code, listed on its lot page, to view the laboratory's own copy of the certificate.
Why is the measured net content different from the vial size?
Net content is the laboratory's measurement of peptide in the tested vial. Current lots measured 10.44 mg in a 10 mg vial.
Buying KPV
Where can I buy KPV?
Current KPV research material availability is provided through Klow.bio, the purchasing platform operated by Klow Labs: https://klow.bio/product/kpv/ Lot records, testing information and certificates of analysis are published on kpv.bio so they can be reviewed before purchasing.
Can I order KPV?
Yes. Purchasing information and current availability for KPV research material are provided through Klow.bio: https://klow.bio/product/kpv/
Is every KPV lot independently tested?
Yes. Every lot is tested by ILS Laboratories, an independent laboratory, for HPLC-UV purity, HPLC-RTM identity and net content. The stated release specification is ≥95% HPLC-UV purity with identity confirmed by HPLC retention-time match against a reference standard. The current lot, KB-96378, reported 99.69% purity.
How can I verify a KPV lot?
Enter the lot number from your vial label at kpv.bio/verify/ to see that lot's results. To confirm with the laboratory directly: Go to portal.ils-lab.com (or scan the QR code on the certificate) and enter the lot's verification access code, listed on its lot page, to view the laboratory's own copy of the certificate.
How much does KPV cost?
The current price is $39.99, with bundle pricing (2 vials save 5%; 3 or more vials save 10%). Current pricing is always listed on Klow.bio.
How fast does KPV ship?
Orders ship the next business day. Same-day cutoff is 4:00 PM CT, with overnight and 2-day options at checkout.
Company
Who is KPV Labs?
KPV Labs is a dedicated KPV research supplier with a controlled sourcing and quality-assurance program. Research material is sourced through our qualified manufacturing supply chain and subjected to analytical testing and lot-level documentation before release. KPV Labs is operated by Klow Labs LLC in Chicago, IL. Purchasing is handled through Klow.bio.
Who operates KPV Labs?
KPV Labs is operated by Klow Labs LLC, 3838 N Ravenswood Ave PMB 2027, Chicago, IL 60613. Klow Labs LLC also operates klow.bio.
Does KPV Labs provide medical or usage advice?
No. KPV Labs supplies research material and publishes analytical documentation. It does not provide medical advice, dosing, administration guidance or protocols.
How do I contact KPV Labs?
Email contact@klow.bio, call (708) 262-7687, or use the contact form at kpv.bio/contact/.
Didn't find your answer? Contact KPV Labs and include your lot number if your question is about a specific vial.
Buy KPV
10 mg vials. Current lot KB-96378 tested at 99.69% purity with identity confirmed by HPLC retention-time match against a reference standard. Current purchasing is available through Klow.bio.