Licensed Peptides
For most research orders, we recommend Licensed Peptides over Peptide Partners. Here is why:
- 1Lower price to get started
On 11 of 12 products both companies list, the smallest Licensed Peptides order costs less than the smallest Peptide Partners pack, because Licensed Peptides sells single vials.
- 2An extra 5% off
Use the code in the sidebar at checkout for 5% off your Licensed Peptides order.
- 3No FDA warning letter on record
We found no FDA warning letter for Licensed Peptides. The FDA issued warning letter 735063 to Peptide Partners LLC on August 24, 2026.
- 4Accredited lab named on its COA
The Licensed Peptides COA we reviewed names Vanguard Laboratory, listed under A2LA Certificate 6377.01.
FOR RESEARCH USE ONLY. NOT FOR HUMAN CONSUMPTION.
The short answer
Licensed Peptides is our pick. It costs less to get started, you can add the 5% code on top, and unlike Peptide Partners it has no FDA warning letter on record. Both companies publish third-party lab documents, so the choice comes down to price, track record and documentation.
Peptide Partners has advantages too, and we list them below: its larger packs often work out cheaper per milligram, and it runs a searchable certificate database. Each fact on this page carries a label: Source-checked, Document reviewed, Published policy checked, Company-stated or Not independently verified. See the methodology.
Pricing: Licensed Peptides costs less to start
Licensed Peptides sells most compounds as a single vial. Peptide Partners sells multi-vial packs. That means a first order, or a small top-up order, is usually cheaper at Licensed Peptides. Smallest available order on each site, list price, checked October 8, 2026:
| Product | Licensed Peptides smallest order | Peptide Partners smallest order | Lower starting price |
|---|---|---|---|
| Ipamorelin | $43.325 mg vial | $82.0020 mg pack | Licensed Peptides |
| Kisspeptin-10 | $68.995 mg vial | $120.0020 mg pack | Licensed Peptides |
| GHK-Cu | $61.9950 mg vial | $150.00200 mg pack | Licensed Peptides |
| Epithalon | $91.9910 mg vial | $216.0080 mg pack | Licensed Peptides |
| Sermorelin | $68.995 mg vial | $98.0020 mg pack | Licensed Peptides |
| TB-500 | $99.9910 mg vial | $130.0020 mg pack | Licensed Peptides |
| Pinealon | $76.9910 mg vial | $100.0040 mg pack | Licensed Peptides |
| DSIP | $53.995 mg vial | $75.0010 mg pack | Licensed Peptides |
| KPV | $76.9910 mg vial | $88.0020 mg pack | Licensed Peptides |
| SS-31 | $99.9910 mg vial | $110.0020 mg pack | Licensed Peptides |
| MOTS-c | $76.9910 mg vial | $79.0020 mg pack | Licensed Peptides |
| 5-Amino-1MQ | $68.995 mg vial | $56.0020 mg pack | Peptide Partners |
Licensed Peptides has the lower starting price on 11 of 12 products, before the 5% code. It is also cheaper per milligram on some larger sizes: SS-31 50 mg is $244.99 at Licensed Peptides against $253 at Peptide Partners.
Where Peptide Partners is cheaper: on bulk orders, its larger packs (100 mg and up) usually cost less per milligram. If cost per milligram on a large order is your main concern, compare the exact sizes you need on both sites. Prices change often; check the live price before ordering.
FDA record
On August 24, 2026, the FDA’s Center for Drug Evaluation and Research issued warning letter 735063 to Peptide Partners LLC, addressed to Pirsek Technologies. After reviewing peptide.partners in July 2026, the FDA said seven products listed on the website were unapproved new drugs, citing statements on the product pages, and asked for a written response within 15 business days. We did not check whether Peptide Partners has since responded or changed its pages.
A search of the FDA warning letter database on October 8, 2026 returned no warning letter issued to Licensed Peptides.
Side-by-side comparison
| Criterion | Licensed Peptides | Peptide Partners |
|---|---|---|
| Lowest starting price | Single vials from $43.32 (Ipamorelin 5 mg). Lower starting price on 11 of 12 matched products Source-checked | Multi-vial packs, from $56 (5-Amino-1MQ 20 mg). Larger packs often cost less per mg Source-checked |
| FDA warning letter | None found in the FDA warning letter database (searched October 8, 2026) Source-checked | Warning letter 735063, issued August 24, 2026 by FDA’s Center for Drug Evaluation and Research Source-checked |
| Extra discount | 5% off with the code shown on this page Company-stated | None offered on this page Not independently verified |
| Operating entity | Licensed Peptides is the trading name used on its public website. Legal entity details were not checked against official business registration records Not independently verified | Peptide Partners identifies itself under that trading name. Its published refund policy refers to Pirsek Technologies. The precise contracting entity and the relationship between these names were not independently established Not independently verified |
| Public COA access | COA link shown on each listed product on the homepage; testing report pages for purity, endotoxin and residual solvents Source-checked | Searchable “Independent Certifications” page, filterable by agent, batch ID, laboratory and date Source-checked |
| Named testing laboratories | Vanguard Laboratory (named on the COA we reviewed) and Ethos Analytics (named on the testing page) Source-checked | Chromate, TrustPointe and Kovera (named on certification records) Source-checked |
| Laboratory accreditation shown | The reviewed COA references A2LA accreditation; Vanguard Laboratory is listed under A2LA Certificate 6377.01. Whether each reported method is within the accredited scope was not checked Document reviewed | No laboratory accreditation certificate number was identified in the Peptide Partners certification records sampled for this comparison Not independently verified |
| Test types listed | Six checks per lot: appearance, identity (mass spectrometry), HPLC purity, content, endotoxin (LAL) and sterility; heavy-metal screening also listed Company-stated | 424 published certification records on the date checked: 133 purity, 122 endotoxin, 110 heavy-metal and 59 sterility. Records are not necessarily separate batches, products or samples Source-checked |
| Batch-to-document matching | Lot number printed on the COA; a scan-to-verify QR code on each vial is described Company-stated | Batch ID and coded manufacturer (for example WF03) shown on each certification record Source-checked |
| Manufacturing statements | States that it works with manufacturers operating under specified quality-management and manufacturing standards. Facility certifications, scope and location were not independently verified Company-stated | States that it audits manufacturing partners using third-party laboratories, and that its certificates can be validated on each laboratory’s website. Not independently verified Company-stated |
| Shipping terms | States that most orders arrive in 1–2 business days and that in-stock orders ship the same day Company-stated | Free shipping on orders over $400; high-demand notice that shipping may be slower Published policy checked |
| Damaged or incorrect goods | Refund and return page requires an account to view; not reviewed Not independently verified | Photos must be emailed within 48 hours of delivery; replacement or reshipment at the company’s discretion Published policy checked |
| Cancellations | Not reviewed (page requires an account) Not independently verified | Full refund only before shipment; shipped orders cannot be cancelled or refunded Published policy checked |
| Support channels | Phone and text support at +1 (855) 322-2214 Source-checked | Phone, text and email support, 10am–5pm ET, Monday to Friday Published policy checked |
Information checked on October 8, 2026. Published terms can change; check each company’s current pages before ordering.
Testing documentation
Licensed Peptides
We examined one publicly available Licensed Peptides COA: a Vanguard Laboratory report for a 20 mg two-component blend, identified as lot V260908-14. This was a document review, not an independent laboratory test or confirmation that the submitted sample represented the wider batch. The document reports:
- Chromatographic purity by HPLC-UV/VIS of 99.11%, with identity reported as matching the reference standard.
- A measured quantity for each of the two components.
- A residual-solvent screen by GC-MS, with listed solvents reported as not detected.
- A named laboratory director and operations manager, and a reference to A2LA accreditation. Vanguard Laboratory is listed under A2LA Certificate 6377.01; we did not check whether each reported method falls within the accredited scope.
The report also states its own limits: the laboratory did not observe sample selection, the results relate only to the portion of the sample tested, and blend purity is a combined chromatographic area figure rather than absolute mass purity.
Licensed Peptides states that every lot is checked six ways (appearance, mass-spectrometry identity, HPLC purity, content, endotoxin by LAL and sterility) at accredited third-party laboratories, naming Vanguard Laboratory and Ethos Analytics. We examined one COA, not every lot, so the six-check process is labelled company-stated.
Peptide Partners
The Independent Certifications page lists records by agent, batch ID, coded manufacturer, laboratory, date and result, each with a linked certificate file. On October 8, 2026 it showed 424 certification records (a record is not necessarily a separate batch, product or sample): 133 purity, 122 endotoxin, 110 heavy-metal and 59 sterility. The named laboratories were Chromate, TrustPointe and Kovera. Some purity records are marked “Double validated” and show results from two laboratories for the same batch.
Peptide Partners states that product descriptions contain manufacturer identifiers and that its certificates can be validated through the issuing laboratories. We did not independently perform that validation.
Showing a manufacturer code on each record is a documentation detail that Licensed Peptides does not publish in the same form. We did not open every certificate file, and we did not find accreditation certificate numbers on the records we reviewed.
Batch traceability
Both companies link documents to a batch identifier. Licensed Peptides prints the lot number on the COA and describes a scan-to-verify QR code on each vial that opens that lot’s report. We did not check the QR code ourselves. Peptide Partners lets a reader search records by batch ID and shows which coded manufacturer produced the batch.
A batch identifier only helps a laboratory if the number on the vial matches the number on the document. Researchers should make that check on receipt with either supplier.
Shipping, orders and support
Peptide Partners publishes free shipping on orders over $400 and a notice that high demand may slow shipping. Damaged or incorrect goods must be reported with photographs within 48 hours of delivery. Orders can be cancelled for a full refund only before shipment. Support is available by phone, text and email from 10am to 5pm ET, Monday to Friday.
Licensed Peptides states that in-stock orders ship the same day and most orders arrive in 1–2 business days, with phone and text support at +1 (855) 322-2214. Its refund and return terms were behind an account sign-in when we checked, so they are not compared here.
What these records establish, and what they do not
A COA or certification record shows the result for the sample that the laboratory received. It does not show that every unit in a batch is identical, and a single report does not describe a supplier’s full catalogue. Third-party records also do not replace a laboratory’s own incoming checks.
We did not buy or test any material from either company for this comparison. Everything here comes from documents each company publishes.
Published on behalf of Licensed Peptides, one of the two companies compared, by a Licensed Peptides marketing affiliate. Based only on public web pages and documents checked on October 8, 2026. Prices are public list prices on that date, before shipping and discounts. We examined one Licensed Peptides COA and a sample of Peptide Partners certification records, not every lot or file. Some Licensed Peptides pages require an account and were not reviewed. No product purchases or independent testing were carried out.
Corrections
If either company, or any reader, believes something on this page is inaccurate or out of date, please tell us through our contact page with a link to the current source. We review requests and update the page, including its checked date. See our Editorial Policy.
Sources
- Licensed Peptides homepage (product COA links): licensedpeptides.com/
- FDA warning letter 735063 to Peptide Partners LLC, August 24, 2026
- Peptide Partners product pages (pack prices)
- Licensed Peptides, testing methodology page: licensedpeptides.com/testingmethodology/
- Licensed Peptides, manufacturing process page: licensedpeptides.com/manufacturing-process/
- Licensed Peptides, About page: licensedpeptides.com/about/
- Vanguard Laboratory COA for Licensed Peptides lot V260908-14 (PDF): licensedpeptides.com/wp-content/uploads/2026/09/BPC-157-TB-500-Wolverine-Blend-20mg-V260908-14-Licensed-Peptides-Report-001.pdf
- Peptide Partners homepage
- Peptide Partners, Independent Certifications
- Peptide Partners, Shipping
- Peptide Partners, Refund Policy
- Peptide Partners, Contact
FOR RESEARCH USE ONLY. NOT FOR HUMAN CONSUMPTION.
These products are intended exclusively for laboratory research purposes and are not intended to diagnose, treat, cure, mitigate, or prevent any disease or medical condition.
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FOR RESEARCH USE ONLY. NOT FOR HUMAN CONSUMPTION.
