Vendor comparison · 2026
KPV vendors: 29 compared on COAs and price
Tissue & recoveryAlso known as Lys-Pro-Val, alpha-MSH (11-13)
Evidence tier
Limited published literature
17 publications over 27 years · trials not yet curated
- Vendors carrying it
- 29
- 25 with a listed price
- Vendors with checkable COAs
- 13
- 17 publish any certificate
- Lots tested
- 25
- 20 naming a checkable lab
- Independent assays
- 0
- none on file yet
- Newest assay
- 21 Sept 2026
- oldest 1 Mar 2025
- Laboratories named
- 7
- most often Freedom Diagnostics Testing
- Median label gap
- 4.6%
- 52% of lots within 5% of label
- Median purity
- 99.71%
- 24 of 25 lots at 99% or above
- Lowest price per mg
- $2.80
- peer median $5.00
- Publications located
- 17
- researched since 1999
Source: PepIndex, an independent index of research-peptide vendors. No vendor can pay for a rank, every score is computed by a published formula, and every figure links to the document it was read from.
Featured in the October 2026 peptide COA report →
Next Gen Peptides has the most checkable KPV testing in this index: 4 lots assayed by ILS Laboratories, the newest on 24 Aug 2026. The lowest listed price is $2.80 per mg at Origin Labs, against a peer median of $5.00. 29 vendors carrying KPV are compared below. 13 publish at least one certificate naming a checkable laboratory, 25 lot records are on file, and none is an independently commissioned assay. Figures are PepIndex's own: it is an independent index of research-peptide vendors, no vendor can pay for a rank, and each figure links to the certificate it was read from.
Every vendor carrying KPV
| # | Vendor | Score here | Price / mg | Lots | Newest test | Laboratory | Mean purity | Label gap | Reports |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Origin LabsISO/IEC 17025 | 96.9100% | $2.80 (56%) | 1 / 1 | Freedom Diagnostics Testing | 99.7% | 41.2% | ||
| 2 | Next Gen PeptidesISO/IEC 17025 | 92.697% | $3.50 (70%) | 4 / 4 | ILS Laboratories | 99.6% | 3.4% | ||
| 3 | Amino ClubISO/IEC 17025Age-gated COAs | 89.598% | $4.00 (80%) | 1 / 1 | Freedom Diagnostics Testing | 99.5% | 37.6% | ||
| 4 | PeptidePlugs | 88.394% | $4.00 (80%) | 4 / 4 | Freedom Diagnostics Testing | 99.7% | 20.4% | ||
| 5 | Ascend ScienceISO/IEC 17025 | 88.294% | $4.55 (91%) | 0 | — | — | — | — | |
| 6 | One Aminos | 85.889% | $4.00 (80%) | 1 / 1 | United Laboratories | 99.9% | 7.0% | ||
| 7 | Hydro Research PeptidesISO/IEC 17025 | 83.989% | — | 0 / 1 | Not named | 98.2% | 26.6% | ||
| 8 | Modern AminosISO/IEC 17025COAs need an account | 82.597% | $4.60 (92%) | 1 / 1 | Freedom Diagnostics Testing | 99.8% | 19.4% | ||
| 9 | Bench Grade Peptides | 81.589% | $4.80 (96%) | 1 / 1 | Freedom Diagnostics Testing | 99.9% | 5.1% | ||
| 10 | Ascension Peptides | 81.489% | $5.00 (100%) | 1 / 1 | MZ Biolabs | 99.8% | 0.2% | ||
| 11 | Simple Peptide | 81.192% | $4.50 (90%) | 1 / 1 | Freedom Diagnostics Testing | 99.9% | 5.1% | ||
| 12 | NeuroLabs Research | 76.891% | $5.99 (120%) | 0 | — | — | — | — | no reportVisit site |
| 13 | Koi PeptidesAge-gated COAs | 76.492% | $5.00 (100%) | 0 / 1 | Not named | 99.6% | 4.6% | ||
| 14 | CuroISO/IEC 17025 | 74.397% | $7.40 (148%) | 1 / 1 | BTLabs | 99.6% | 27.0% | ||
| 15 | Good Science Bio | 73.571% | $3.50 (70%) | 0 | — | — | — | — | no reportVisit site |
| 16 | Evo Labs Research | 72.387% | $5.00 (100%) | 0 | — | — | — | — | no reportVisit site |
| 17 | Northline LabsISO/IEC 17025 | 71.595% | $7.50 (150%) | 0 | — | — | — | — | no reportVisit site |
| 18 | Protide HealthAge-gated COAs | 70.192% | $7.00 (140%) | 0 | — | — | — | — | no reportVisit site |
| 19 | Eternal Peptides | 63.863% | $4.55 (91%) | 0 | — | — | — | — | no reportVisit site |
| 20 | Licensed Peptides | 62.887% | $7.70 (154%) | 1 / 1 | Vanguard Laboratory | 99.8% | 2.1% | ||
| 21 | True Research Labs | 60.468% | $5.90 (118%) | 0 | — | — | — | — | no reportVisit site |
| 22 | Improved Peptides | 59.587% | $6.90 (138%) | 0 | — | — | — | — | no reportVisit site |
| 23 | Vial Drop Labs | 59.474% | — | 2 / 2 | KMD Analytical (KMD Group LLC) | 100.0% | 1.3% | ||
| 24 | Extreme Peptides | 57.980% | — | 0 / 1 | Not named | 99.2% | 1.0% | ||
| 25 | Vertex Labs | 56.172% | — | 1 / 1 | Freedom Diagnostics Testing | 99.7% | 0.6% | ||
| 26 | BioLongevity Labs | 54.572% | $10.00 (200%) | 0 | — | — | — | — | no reportVisit site |
| 27 | Sports Technology LabsAge-gated COAs | 50.771% | $10.40 (208%) | 0 | — | — | — | — | no reportVisit site |
| 28 | Biotech Peptides | 49.160% | $9.75 (195%) | 0 | — | — | — | — | no reportVisit site |
| 29 | Mile High Compounds | 48.591% | $8.00 (160%) | 0 / 2 | Not named | 99.0% | 1.7% |
Independent assays
No independently commissioned assay of KPV is on file. All 25 records below were published by the vendor that sells the product, naming the laboratory shown. PepIndex does not yet commission its own assays, so nothing on this page establishes what is in a vial beyond the vendor’s own certificate. A record moves into this section the moment an assay commissioned by anyone other than the seller is indexed.
What the certificates show
24 of 25 lots at 99% or above; median 99.71%.
| Range | lots |
|---|---|
| <95% | 0 |
| 95–97% | 0 |
| 97–98% | 0 |
| 98–99% | 1 |
| 99–99.5% | 6 |
| ≥99.5% | 18 |
52% of lots within 5% of the labelled mass; median gap 4.6%.
| Range | lots |
|---|---|
| ≤2% | 7 |
| 2–5% | 6 |
| 5–10% | 3 |
| 10–20% | 3 |
| >20% | 6 |
25 vendors, $2.80 to $10.40; median $5.00.
| Range | vendors |
|---|---|
| $2.00–$4.00 | 3 |
| $4.00–$6.00 | 13 |
| $6.00–$8.00 | 5 |
| $8.00–$10.00 | 2 |
| $10.00–$12.00 | 2 |
Purity and mass are read from each certificate as published; the label gap is |labeled − assayed| ÷ labeled. Every value behind these bars is in the certificate table below.
Laboratories used
| Laboratory | Lots | Vendors | Share | Verify |
|---|---|---|---|---|
| Freedom Diagnostics TestingUS | 10 | 7 | 40% | Public lookup |
| ILS LaboratoriesUS | 4 | 1 | 16% | Public lookup |
| KMD Analytical (KMD Group LLC)US | 2 | 1 | 8% | Public lookup |
| BTLabs | 1 | 1 | 4% | No public lookup found |
| MZ BiolabsUS | 1 | 1 | 4% | No public lookup found |
| United LaboratoriesIN | 1 | 1 | 4% | Public lookup |
| Vanguard LaboratoryUS | 1 | 1 | 4% | No public lookup found |
5 further records nameno checkable laboratory (a placeholder, a signature line or the vendor’s own name). They are listed in the certificate table but not counted as third-party testing.
Every certificate record
Score breakdown
The score has two halves: the research base — how long the compound has been studied and how much has been published — and the quality of the evidence the market produces for it, aggregated across every vendor that carries it: assayed purity, lot-to-lot consistency, readable third-party certificates and those vendors’ review record. It measures the evidence base, not the merits or safety of the substance.
Studied since 1999 — 27 years of published research
How long the compound has been studied. Fifteen years or more of published literature earns full marks; a newer compound earns less.
17 publications indexed in PubMed
The volume of published literature located. Full marks at fifty or more publications.
Mean assayed purity 99.6% across 25 certificates
Average assayed purity on the certificates published by vendors that carry this compound. Full marks at 99.5%+, nothing at 95% or below.
±0.40 pts purity across lots, mean label deviation 11.2%
How tightly assayed purity and labeled-versus-actual mass hold across different lots. Rewards reproducible manufacturing.
29 of 29 listing vendors publish an accessible certificate policy
Whether the vendors carrying this compound publish per-lot certificates anyone can read without an account.
20 of 25 certificates from a recognised independent lab
Share of certificates issued by a recognised third-party testing lab rather than an unnamed or self-named one.
What is KPV?
A tripeptide (lysine-proline-valine) corresponding to the C-terminal fragment of alpha-melanocyte-stimulating hormone, studied for anti-inflammatory signalling.
Studied in published research for anti-inflammatory and gut-health applications.
Regulatory status
Labeled by vendors for laboratory research use only. Not approved as a medicine in the United States, United Kingdom, or European Union.
What the research examines
The areas of published research this compound appears in. These describe what the literature has studied — never a claim of benefit, effect or suitability for any use.
Published research
Published work is preclinical, in cell and animal models of inflammation. PepIndex does not evaluate clinical significance and does not describe administration.
- Melanocortin-derived tripeptide KPV has anti-inflammatory potential in murine models of inflammatory bowel disease — Inflammatory bowel diseases (2008)
Peer-reviewed article indexed in PubMed, published in Inflammatory bowel diseases (2008).
- Orally Targeted Delivery of Tripeptide KPV via Hyaluronic Acid-Functionalized Nanoparticles Efficiently Alleviates Ulcerative Colitis — Molecular therapy : the journal of the American Society of Gene Therapy (2017)
Peer-reviewed article indexed in PubMed, published in Molecular therapy : the journal of the American Society of Gene Therapy (2017).
- PepT1-mediated tripeptide KPV uptake reduces intestinal inflammation — Gastroenterology (2008)
Peer-reviewed article indexed in PubMed, published in Gastroenterology (2008).
- Structural modification of the tripeptide KPV by reductive "glycoalkylation" of the lysine residue — PloS one (2018)
Peer-reviewed article indexed in PubMed, published in PloS one (2018).
- Inhibition of cellular and systemic inflammation cues in human bronchial epithelial cells by melanocortin-related peptides: mechanism of KPV action and a role for MC3R agonists — International journal of physiology, pathophysiology and pharmacology (2012)
Peer-reviewed article indexed in PubMed, published in International journal of physiology, pathophysiology and pharmacology (2012).
- Drug-loaded nanoparticles targeted to the colon with polysaccharide hydrogel reduce colitis in a mouse model — Gastroenterology (2010)
Peer-reviewed article indexed in PubMed, published in Gastroenterology (2010).
- Effects of the COOH-terminal tripeptide alpha-MSH(11-13) on corneal epithelial wound healing: role of nitric oxide — Experimental eye research (2006)
Peer-reviewed article indexed in PubMed, published in Experimental eye research (2006).
- New insights into the functions of alpha-MSH and related peptides in the immune system — Annals of the New York Academy of Sciences (2003)
Peer-reviewed article indexed in PubMed, published in Annals of the New York Academy of Sciences (2003).
PepIndex describes what literature exists. We do not interpret it, assess clinical significance, or publish quantities, protocols or instructions for use.