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American Peptides Reviews: Lab Testing, Certificates and Standards Score
American Peptides is a research peptide supplier that ships from Shreveport, Louisiana. Project Biohacking scores it 59 out of 100. In October 2026, Eli Lilly sued American Peptides in federal court over its sales of retatrutide, and the case is pending.
This review covers the lawsuit, what the company's certificates actually show, what happened when we checked one at the issuing laboratory, and where its written terms contradict each other.
Last updated: November 8, 2026
Standards Score 59 / 100
Project Biohacking Editorial Rating
Scored against four published criteria. Last reviewed November 8, 2026.
American Peptides publishes a free certificate library covering 51 products, with a lot number on every document we opened. Each certificate carries a verification code, and the issuing laboratory's lookup returned a certificate for the code we tried.
The gaps are the laboratory and the paperwork around it. Every certificate we read came from one laboratory, Bioviridian, which states it is still working toward ISO/IEC 17025 accreditation. The test panel also varies from one certificate to the next.
Affiliate disclosure: Some links on this page are affiliate links. If you purchase through them, Project Biohacking may earn a commission at no additional cost to you.
American Peptides Research Peptides
American Peptides sells lyophilized research peptides, multi-peptide blends, Khavinson-style bioregulators, nasal sprays, dissolving strips, research bundles, and lab supplies such as reconstitution kits. Checkout takes cards only, and orders of $300 or more ship free. Project Biohacking keeps the current American Peptides discount codes on a separate page, with the dated cart test for our own code.
What American Peptides does well
A public certificate library with no account. The COA page lists 51 products, each tied to a lot code, and every PDF opens without signing in.
Certificates you can check at the laboratory. Each Bioviridian certificate prints a web verification code. We entered COA7595 at the laboratory's own search page on November 6, 2026, and it returned a certificate for the same TB-500 lot with the same purity and content figures.
Core contaminant testing on recent lots. The August 2026 certificates we read report endotoxin (USP <85>) and heavy metals (USP <232>) alongside identity, content and purity. A June 2026 certificate adds a sterility result (USP <71>).
Purity above its own claim. The site states 99% or higher by HPLC. All four certificates we read cleared it, from 99.68% to 99.9%.
The certificates themselves print no purity limit, which costs points in the score.
Where it falls short
A pending federal lawsuit. Eli Lilly sued American Peptides LLC on October 8, 2026, alleging that the company sells retatrutide, an unapproved drug, under a research-only label. The court has not ruled. Details are in the lawsuit section below.
One laboratory, not accredited. Every certificate we opened was issued by Bioviridian Inc. No accreditation number appears on any of them, and the laboratory has said publicly that it is working toward ISO/IEC 17025 accreditation. Some third-party review sites describe American Peptides' testing as ISO 17025 accredited. We could not confirm that, and American Peptides' own quality page does not make the claim.
The test panel is not the same on every certificate. The quality page promises sterility testing on every lot. Sterility appears on one of the four certificates American Peptides hosts that we read. The March 2026 certificate covers identity, content, purity and endotoxin only.
Two versions of the same certificate. The copy of COA7595 on American Peptides' site is dated August 17, 2026 and has no sterility row. The copy the laboratory returns is dated August 28, 2026 and adds "Sterility: Not Detected." The results that appear on both match. Read the laboratory's copy.
Written terms that disagree. The same-day shipping cutoff is given as 2 PM Eastern in one place and 12 PM Central in another. The Terms allow 7 days to report damage; the shipping policy says 72 hours. The Terms list ACH, wire, and crypto; checkout offered cards only. The Terms say continental U.S. only; checkout lists Alaska, Hawaii, and APO/FPO addresses.
No named people. The Terms name American Peptides LLC under Louisiana law. No founder or principal is named anywhere on the site.
A short track record. The domain was registered in February 2026. We disclose this but do not score it.
Who it suits
Researchers who want a lot-numbered certificate before they buy and are willing to look it up at the laboratory themselves.
Buyers who need an accredited laboratory, or more than one laboratory, on the certificate will not find that here yet.
Third-party testing and laboratory documentation
Which laboratory tests American Peptides products
All four certificates we opened were issued by Bioviridian Inc., an analytical laboratory in College Station, Texas, and signed by its principal chemist. Identity is confirmed by mass spectrometry (LC-MS/MS on recent certificates, MALDI-MS on older ones), and purity by reverse-phase HPLC at 214 nm.
| Laboratory | Accreditation shown on the certificate | Certificates we opened | Role |
|---|---|---|---|
| Bioviridian Inc. | None. The lab says ISO/IEC 17025 is in progress | 4 | Identity, content, purity, endotoxin, heavy metals, sterility (on some) |
The library groups certificates by product. Most current lots carry an August 2026 code, and liquid sprays and strips point to the certificate for the lyophilized lot they were made from.
What a single lot actually gets tested for
We read the certificate for TB-500 10 mg, lot TB10-0803, received by the laboratory on August 11, 2026.
| Procedure | Method | Result |
|---|---|---|
| Identity | LC-MS/MS | Confirmed, TB-500 |
| Content | HPLC quantitation | 10.23 mg |
| Purity | RP-HPLC, 214 nm | 99.68% |
| Endotoxin | USP <85> | Below 0.05 EU/mL |
| Heavy metals | USP <232> | Below 0.01 ppm |
| Sterility | USP <71> | Not Detected (laboratory copy only) |
Every line is marked "Conforms." Absent from this certificate and the other three we read: residual solvents, trifluoroacetic acid, container closure integrity and solubility.
How the panel changed across four certificates
| Certificate | Issued | Sterility | Heavy metals | Purity |
|---|---|---|---|---|
| Sermorelin 5 mg, lot SERMO5-0318 | April 2026 | Not on certificate | Not on certificate | 99.8% |
| Certificate COA4845 | June 2026 | Not Detected | Below 0.01 ppm | 99.9% |
| TB-500 10 mg, lot TB10-0803 | August 2026 | Laboratory copy only | Below 0.01 ppm | 99.68% |
| Certificate COA7580 | August 2026 | Not on certificate | Below 0.01 ppm | 99.83% |
The Sermorelin certificate reports 6.36 mg of content in a 5 mg vial. More peptide than labeled changes your concentration math, so measure before you dose a research model.
How to check a certificate yourself
- Open the American Peptides COA library and find the lot number printed on your vial.
- Copy the web verification code from the top right of the certificate (it starts with COA).
- Enter it at the Bioviridian COA search page, bioviridians.com/coa-search.html.
- Compare the laboratory's copy with American Peptides' copy, line by line. If they differ, rely on the laboratory's copy.
Full criteria and weightings are on the rating methodology page.
What American Peptides sells
Individual research peptides. Healing, growth hormone secretagogue, mitochondrial and cosmetic research compounds, mostly in lyophilized vials.
Metabolic research compounds. American Peptides lists part of its incretin-adjacent range under internal product codes rather than common compound names (AP-RTA-3™, AP-TRZ-2™, AP-SEM-1™, AP-MX4™, AP-AMR1™, AP-TESA™), so read the product description and verify identity via the product COA. Before researching this class, run the GLP-1 Risk Assessment Calculator.
Blends, bioregulators, sprays and strips. Pre-mixed vials, short bioregulator peptides, and liquid formats that reuse the lyophilized lot's certificate.
Lab supplies. Reconstitution kits and related consumables. For the math, use the peptide calculator and the peptide reconstitution guide.
Manufacturing and sourcing
American Peptides' about page describes testing, not manufacturing. It does not name a synthesis source or a fill facility, so we cannot say where its peptides are made.
No research peptide supplier in this market makes its own active ingredient. The certificate, not the "American" in the name, is what tells you about the vial.
How American Peptides scored
| Criterion | Weight | Score | What decided it |
|---|---|---|---|
| Assay depth | 22 | 17 | Identity, purity, endotoxin, heavy metals and sterility observed on certificates. No extended assays. |
| Certificate accessibility | 6 | 6 | Public library, no account. |
| Lot traceability | 7 | 5 | Per-lot and lot-matched. Held below full marks because the laboratory's copy of COA7595 differs from the vendor's copy. |
| Vial-to-document link | 2 | 0 | No scannable code on the vial was evidenced. |
| Laboratory cross-verification | 2 | 0 | One laboratory. |
| Accredited laboratory | 3 | 0 | No accreditation stated on the certificate. |
| Purity against specification | 5 | 0 | The certificates print results but no purity limit. The 99% figure appears on the website only, and the methodology scores a certificate with no stated specification at zero. |
| Certificate library | 3 | 3 | Organized by product and lot. |
| Analytical documentation | 50 | 31 | |
| Identity disclosure | 12 | 8 | American Peptides LLC named in the Terms. |
| Public accountability | 8 | 2 | Entity named, no individual. |
| Ownership and accountability | 20 | 10 | |
| Shipping disclosure | 5 | 3 | Tiers published, but cutoff times and service area conflict. |
| Returns and replacements | 5 | 3 | Policy in days, but 72 hours and 7 days both appear. |
| Support channels | 4 | 3 | Phone, text and email published. |
| Payment resilience | 3 | 1 | Cards only at checkout. |
| Catalog depth | 3 | 3 | Broad range, including hard-to-source formats. |
| Commercial terms | 20 | 13 | |
| Complaint profile | 6 | 2 | Trustpilot shows 71 reviews averaging 4.0 as of November 8, 2026. About a fifth are one-star, mostly from October 2026, and center on orders that did not arrive, tracking that did not work, and support that did not answer. Those are the complaint types the methodology counts, and recent reports weigh more. |
| Review authenticity | 2 | 1 | Review set checked against our coordinated-posting criteria. |
| Regulatory record | 2 | 2 | No FDA warning letter or other enforcement action against American Peptides found as of November 8, 2026. The pending Eli Lilly lawsuit is a private civil case, which this criterion does not score; it is covered in the lawsuit section. |
| Independent record | 10 | 5 | |
| Standards Score | 100 | 59 | 4.0 stars |
Stars are calculated as 2.5 + 2.5 × (Score − 30) ÷ 50. A score of 59 gives 4.0.
The Eli Lilly Lawsuit and FDA Record
On October 8, 2026, Eli Lilly and Company sued American Peptides LLC in the U.S. District Court for the Western District of Louisiana, case number 5:26-cv-04146. The complaint concerns retatrutide, a weight-loss compound Lilly developed that has no FDA approval. Lilly asks the court to stop the company from selling products that contain it and seeks damages. American Peptides was one of five sellers Lilly sued that day, and one of eleven since August 2026.
Lilly argues that the research-only label does not match how the business operates. Published summaries of the complaint say it points to the reconstitution kits, bacteriostatic water, syringes, and alcohol prep pads sold on the site, to promotion through affiliates, including one affiliate's statements about sales to doctors and medical spas, and to a wholesale program aimed at healthcare businesses. These are Lilly's allegations. The court has not ruled on them.
The public docket listing we checked on November 8, 2026 showed Lilly's complaint and disclosure statements, all filed October 8. That listing can lag the court's own record. If the court grants Lilly's request, American Peptides could be ordered to stop selling products that contain retatrutide. We will update this section as the case moves.
We found no FDA warning letter to American Peptides as of November 8, 2026. On August 24, 2026, the FDA sent warning letters to five other online peptide sellers, treating research-labeled weight-loss peptides as unapproved new drugs. At least one of those letters cited the sale of bacteriostatic water alongside the peptides as evidence they were meant for human use. American Peptides sells reconstitution supplies on its site.
Is American Peptides legitimate?
On the evidence we read, it is a real U.S. business: a named LLC, a published phone and email, a working checkout, and a certificate the issuing laboratory confirms. It is also new, it names no people, its certificates come from a single laboratory that is not yet accredited, and it faces a pending federal lawsuit from Eli Lilly.
Watch for lookalike domains. A site at americanpeptides.live was registered in July 2026 and has been flagged by a domain-safety scanner as a likely fraudulent store. The real store is americanpeptides.us.
The name is also close to American Peptide Company, an unrelated California peptide manufacturer now owned by Bachem.
American Peptides Shipping
- Ships within the U.S. only, from Louisiana.
- Processing is stated as 24 to 48 hours. The same-day cutoff appears as both 2 PM Eastern and 12 PM Central.
- Standard shipping was $12.99 in our checkout tests. Orders of $300 or more ship free.
- Checkout accepts Alaska, Hawaii and APO/FPO addresses, although the Terms say continental U.S.
American Peptides Return Policy
All sales are final. Damaged or incorrect items are replaced if reported in time, but the window is 72 hours in the shipping policy and 7 days in the Terms. Report within 72 hours to be safe, with photos.
Orders can be canceled if American Peptides cannot verify research use. Its research-use policy, effective October 8, 2026, excludes clinics, while its wholesale page lists clinics among its customers.
American Peptides Quality Standards
American Peptides advertises a seven-layer standard: identity by mass spectrometry, HPLC purity, net peptide content, endotoxin, sterility, heavy metals by ICP-MS, and third-party verification. Across the four certificates we read, each layer appears at least once, but sterility appears on only one of the four copies American Peptides hosts.
If a result matters to your research, check the laboratory's copy of that lot before you order. For help planning a research protocol, see peptide coaching. To compare suppliers, use the vendor directory.
American Peptides Review FAQ
Is American Peptides legit?
It is a real business on the evidence Project Biohacking has read. It names American Peptides LLC in its Terms, publishes a phone number and email, and its certificates carry codes that the issuing laboratory confirms. It is new, names no people, uses a single laboratory that is not yet accredited, and faces a pending Eli Lilly lawsuit.
How does Project Biohacking rate American Peptides?
Project Biohacking scores American Peptides 59 out of 100, which works out to 4.0 out of 5 stars. Analytical documentation earned 31 of the 50 points available.
Has American Peptides been sued?
Yes. Eli Lilly sued American Peptides LLC on October 8, 2026, in the U.S. District Court for the Western District of Louisiana, case 5:26-cv-04146. The suit concerns the company's sales of retatrutide, which has no FDA approval. The court has not ruled.
Has the FDA sent American Peptides a warning letter?
We found none as of November 8, 2026. The FDA sent warning letters to five other online peptide sellers on August 24, 2026, over research-labeled weight-loss peptides.
Who tests American Peptides products?
Every certificate we opened was issued by Bioviridian Inc. of College Station, Texas. No other laboratory appeared.
Is American Peptides' testing lab ISO 17025 accredited?
Not on the evidence available. No accreditation number appears on the certificates, and Bioviridian has said publicly that it is working toward ISO/IEC 17025 accreditation.
Does American Peptides test for sterility?
Sometimes. Sterility appears on one of the four certificates American Peptides hosts that we read, and on the laboratory's copy of a second. Check the certificate for your lot.
How do I verify an American Peptides COA?
Copy the web verification code from the certificate, starting with COA, and enter it at bioviridians.com/coa-search.html. Compare the laboratory's copy with the vendor's copy and rely on the laboratory's copy if they differ.
Do I need an account to see American Peptides certificates?
No. The COA library is public and every certificate we opened downloaded without signing in.
Where is American Peptides located?
Shreveport, Louisiana. Its Terms are governed by Louisiana law.
Does American Peptides ship internationally?
No. American Peptides ships within the United States only, from Louisiana.
What is the American Peptides return policy?
All sales are final. Damaged or incorrect items are replaced if reported in time. The shipping policy says 72 hours and the Terms say 7 days, so report within 72 hours with photos.
What payment methods does American Peptides accept?
Checkout offered credit and debit cards only in our tests. The Terms also list ACH, wire and crypto.
Is American Peptides the same as American Peptide Company?
No. American Peptide Company is an unrelated California peptide manufacturer owned by Bachem. American Peptides sells research peptides at americanpeptides.us.
Does American Peptides have a discount code?
Yes. Project Biohacking keeps the current American Peptides codes, with a dated checkout test, on its American Peptides coupon page.
Affiliate disclosure: Some links on this page are affiliate links. If you purchase through them, Project Biohacking may earn a commission at no additional cost to you. Commission plays no part in the criteria, the weightings or any score.
All products discussed are sold for laboratory research use only. They are not drugs, supplements or cosmetics and are not for human or veterinary consumption.