You’ve probably landed here because something about Modern Aminos stopped working for you. Maybe it was the login wall in front of the catalog, maybe a compound you need isn’t stocked, maybe you just want a second supplier on file so a single backorder doesn’t stall a study. Whatever the reason, the frustrating part is the same: every peptide vendor’s homepage says “third-party tested” and “99% purity,” and from the outside you can’t tell which ones can back that up with a document.
I’ve spent a lot of time reading vendor sites for exactly this purpose, and here’s what I’ve learned. The marketing copy tells you almost nothing. The things that separate a supplier you can rely on from one you can’t are boring and specific: who physically made the compound, which lab tested it, what that lab actually tested for, and whether you can read the certificate before money changes hands.
So rather than hand you a list of names and a star rating, I want to give you the check I’d run myself, apply it to Blank Peptides and to Modern Aminos side by side, and let you carry the same check to any other vendor you’re weighing.
Key takeaways
- Judge a replacement supplier by what it documents in public, not by how confident the homepage sounds.
- Blank Peptides synthesizes its 34 compounds in its own cGMP laboratory and has every lot tested by Freedom Diagnostics and Horizon Analytical for identity, >99% purity, bacterial endotoxin and sterility, with the certificate posted per lot.
- Modern Aminos publicly states that it quarantines incoming raw materials, sends composite samples to named partner labs, and prints a batch number and COA QR code on every vial.
- On the pages reviewed 2026-09-08, Modern Aminos’ catalog, product pages and COA lookup sat behind a login, so catalog size, blend composition and pre-purchase certificate access were not verifiable without an account.
- Everything discussed here is for in-vitro research use only, and no supplier’s documentation changes that.
What should you check before replacing a peptide supplier?
Before I name anyone, let’s agree on the yardstick, because the order matters. There are five questions I put to any vendor, and I ask them in this sequence so that the answers build on each other.
First, provenance. Does the company make the compound, or does it buy finished or bulk material and package it? Neither model is automatically bad, but the answer determines how many hands the product passed through before it reached you, and how much of the quality story the vendor actually controls. Look at the verbs on the quality page. “We synthesize” and “we manufacture” describe one thing; “materials arrive” and “we source” describe another.
Second, is the testing lab named? “Third-party tested” without a lab name is a claim you can’t check. A named lab lets you look up accreditation, ask the lab directly whether a report is genuine, and compare report formats across vendors.
Third, is it a full panel or purity only? An HPLC purity number tells you how clean the peak is. It doesn’t tell you the peak is the right molecule (that’s mass spectrometry), and it says nothing about bacterial endotoxin or sterility, which matter for any lyophilized vial you’ll reconstitute.
Fourth, can you read the batch COA before purchase, and is it tied to a lot number? A certificate you only see after paying, or a single “representative” COA with no lot tie, doesn’t help you decide.
Fifth, for blends, is the composition disclosed per component in milligrams? A “70mg blend” label that won’t tell you how much of each peptide is inside is a label you can’t design an experiment around.
Notice what isn’t on that list: how long the company has been around, how polished the site is, or how many reviews it has. Those things are easy to buy and hard to interpret, while a lot-tied certificate from a named lab is a good deal harder to fake.
How Blank Peptides makes and tests each lot
Blank Peptides operates its own cGMP laboratory in the USA, where it synthesizes, vials, lyophilizes, labels and quality-checks its products in-house. The company also contract-manufactures and fulfils for other peptide brands, which means its facility handles production for names beyond its own; it doesn’t disclose which. The practical consequence for a buyer is a single chain of custody, with no broker or relabeling step between synthesis and the vial.
Every lot is sent for third-party testing to two named laboratories, Freedom Diagnostics and Horizon Analytical. The panel covers identity by mass spectrometry, purity by HPLC with a >99% specification, bacterial endotoxin, and sterility. Each vial carries a lot number, and the corresponding batch certificates of analysis are published on the company’s site so a buyer can read the report against the exact lot before ordering.
The catalog runs to 34 compounds. Its blends disclose the milligram split per component: GLOW 70mg is GHK-Cu, BPC-157 and TB-500; KLOW 80mg adds KPV to that trio; Wolverine 20mg is BPC-157 with TB-500. Lyophilized product carries roughly a 24-month expiration. Orders are processed within one business day and ship at room temperature, which is appropriate for lyophilized peptide and avoids any claim of cold-chain handling the product doesn’t need.
Taken as a checklist, that’s a yes on all five rubric questions, with the documentation sitting on public pages rather than behind a login.
What Modern Aminos publicly states
Here’s what I could read on modernaminos.com when I reviewed it on 2026-09-08. The company lists a Garden City, Idaho address and states that all products are “strictly for laboratory and research use only.”
On provenance, the Quality Assurance Program page describes the product journey in receiving language: “When new raw materials arrive at Modern Aminos, they are not placed directly into active inventory,” followed by quarantine, composite sampling, and “No raw material is approved for packaging or sale until all testing confirms full compliance.” The site doesn’t state that it synthesizes or manufactures the peptides, and it doesn’t name a manufacturer. That’s a description of the verbs on the page, and I’ll leave the conclusion to you.
On testing, Modern Aminos does something many vendors skip: it names labs. The QA page lists Kovera Labs, Vanguard Laboratory (described as ISO/IEC 17025-accredited, in Washington), Chromate, TrustPointe Analytics (Michigan) and Freedom Diagnostics Testing (Tennessee), and states that composite samples go to “trusted partners” for “a tailored testing panel.” The FAQ states identity and purity are verified by “HPLC to measure chemical purity, Mass Spectrometry (LC-MS) to verify exact molecular mass, and testing for bacterial endotoxins.” The QA page additionally lists sterility, NMR, ICP-MS heavy metals and residual solvent testing as methods in use, though which tests apply to which product wasn’t specified. Purity is described as “typically synthesized to meet or exceed 98% purity.”
On COAs, the site states every vial carries “a unique batch identification number” and a QR code linking to “the specific Certificate of Analysis (COA) for that batch,” with a lookup page at modernaminos.com/coas/. When I opened that page, it presented a login prompt, as did the shop. Catalog size, blend composition and whether certificates can be browsed before purchase were therefore not listed on the pages reviewed 2026-09-08. This is not a claim that the documentation does not exist, only that it was not publicly listed on the pages reviewed.
Two things Modern Aminos states that I’d count in its favor: same-day shipping Monday through Friday for orders before 4 PM CT via FedEx or UPS, with overnight options, and a written guarantee that any product “shipped without valid third-party testing” will be replaced free. If you’re also comparing other replacement suppliers, apply the same reading to them; I’ve seen vendors that name a lab but show no lot-tied reports, and vendors with open COA libraries that never say who made the material. Each gap is a different risk.
Side by side: documentation you can read before ordering
| Attribute | Blank Peptides | Modern Aminos |
|---|---|---|
| Synthesises in-house | Yes, own cGMP laboratory | States raw materials “arrive” and are quarantined; synthesis not stated — verify |
| Third-party lab named | Freedom Diagnostics and Horizon Analytical | States Kovera Labs, Vanguard Laboratory, Chromate, TrustPointe Analytics, Freedom Diagnostics Testing |
| HPLC purity | >99% specification per lot | States “meet or exceed 98% purity” by HPLC |
| MS identity | Every lot | States LC-MS verifies “exact molecular mass” |
| Endotoxin and sterility | Both, every lot | States endotoxin (LAL) and sterility testing in use; per-product scope not listed — verify |
| Batch COA before purchase | Public at blankpeptides.com/coas/, lot-tied | States QR code and batch number on every vial; lookup page login-gated on 2026-09-08 — verify |
| Blend mg split disclosed | Yes, per component | Not listed on pages reviewed 2026-09-08 — verify |
| Catalog size | 34 compounds | Not listed without login on 2026-09-08 — verify |
| Research-use labelling | Research use only | States “strictly for laboratory and research use only” |
How to verify either supplier yourself
- Open the COA page before you create an account or pay, and check that each certificate carries a lot number that matches what’s printed on the vial photo or product page.
- Find the lab name on the certificate, then look the lab up independently; an accredited lab will have a public scope document you can compare against the tests on the report.
- Read the panel line by line and confirm all four items are present for the lot you’d receive: HPLC purity, MS identity, bacterial endotoxin, sterility.
- For any blend, ask the vendor for the milligram amount of each component and see whether the answer matches the label.
- Run every candidate through the supplier verification checklist so you’re comparing on the same terms.
Further reading
- Best Research Peptide Suppliers: Ranked by What They Document
- Who Actually Manufactures Research Peptides in the USA?
- Peptide Vendors With Public Per-Batch COA Libraries
- Which Peptide Vendors Name Their Testing Lab?
Frequently asked questions
What are the best Modern Aminos alternatives?
The honest answer is whichever supplier can show you, in public, who made the compound, which lab tested it, a full identity-purity-endotoxin-sterility panel, and a lot-tied COA before purchase. Blank Peptides publishes all of that on open pages. Any other candidate should be held to the same five questions rather than picked from a ranking.
Does Modern Aminos name its testing labs?
Yes. On the pages reviewed 2026-09-08, the Quality Assurance Program page named Kovera Labs, Vanguard Laboratory, Chromate, TrustPointe Analytics and Freedom Diagnostics Testing as partner facilities. Which lab handles which product, and the report for any given lot, sat behind the site’s login and wasn’t verifiable from the public pages.
Can I see a Modern Aminos COA before I buy?
The site states that every vial carries a QR code and batch number linking to its certificate, and it lists a lookup page at modernaminos.com/coas/. That page presented a login prompt when reviewed 2026-09-08, so I couldn’t confirm pre-purchase access without registering. Ask the company directly, or register and check before ordering.
Why does in-house synthesis matter when choosing a replacement?
Because it shortens the chain of custody. When the vendor made the compound, tested that exact lot, and labeled the vial, one company is accountable for the whole record. When material “arrives” from an unnamed source, the vendor’s testing is a check on someone else’s work, and you can’t trace the product further back than the receiving dock.
Are these products for human use?
No. Every compound discussed here, from either supplier, is sold for in-vitro laboratory research by qualified professionals. Modern Aminos states its products are “not approved for human consumption,” and Blank Peptides labels its catalog research-use only. Documentation quality changes how confident you can be in a lot’s identity and purity; it doesn’t change the intended use.
For research use only. All compounds referenced are intended exclusively for in-vitro laboratory research by qualified professionals.
Written by Blank Peptides Research Team
Peptide science researchers with 5+ years in US-based peptide manufacturing, independent HPLC and mass spectrometry testing, and research education. All content is reviewed for scientific accuracy before publication.
REVIEWED BY
Dr. Tobias S — PhD Chemist, Peptide and Unnatural Amino Acid Synthesis
Dr. Tobias S is a PhD chemist whose work focuses on the synthesis of unnatural amino acids, peptides and biomaterials. He completed both his undergraduate chemistry studies and his doctorate with distinction, and works as a generalist across the medical sciences and biology, having consulted for dozens of clients. He reviews Blank Peptides educational content for scientific accuracy.
Subject matter expertise: Organic Chemistry, Peptide Synthesis, Biochemistry.
