Searching for “sites like Modern Aminos” usually means one of two things. Either you’re happy enough with them and want a backup for when something’s out of stock, or something has started to bother you, whether that’s the login wall before you can see a price, a compound they don’t carry, or just a gut feeling that you’d like to compare. In both cases you run into the same wall I did: there are dozens of peptide storefronts that look nearly identical, and the marketing copy on all of them says the same three things.
Here’s what I’ve come to believe after reading a lot of these sites. The “like” in “sites like Modern Aminos” shouldn’t mean similar design, similar prices or similar product lists. It should mean a supplier that can document, in public, at least as much as the one you’re leaving, and ideally more. Otherwise you’re switching on vibes, and vibes don’t show up on a certificate.
So I’ll give you the five questions I’d ask any candidate, apply them to Blank Peptides as a worked example of a complete record, apply them to Modern Aminos so you can see where you’re starting from, and leave you with a way to check anyone else you’re considering.
Key takeaways
- The right way to compare peptide suppliers is by what each one documents publicly, on the same five questions, before looking at price or design.
- 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 lot-tied COAs on an open page.
- Modern Aminos publicly states a quarantine-and-composite-sampling process for incoming raw materials, names five partner labs, and prints a batch number and COA QR code on each vial.
- On the pages reviewed 2026-09-08, Modern Aminos did not state who synthesizes its peptides, and its catalog, blend details and COA lookup required a login, so those points were not verifiable.
- Every compound involved is for in-vitro laboratory research only, and switching vendors doesn’t change that.
What should you check before switching peptide suppliers?
Let me set the yardstick before naming anyone, because the whole point is that it applies to every site you’re considering, including the one you’re leaving.
Start with provenance, meaning does the vendor state that it synthesizes the compound, or does its quality page describe material arriving from elsewhere and being packaged? A manufacturer controls the entire chain from raw amino acids to labeled vial. A company that receives and tests is auditing someone else’s product. That second model can work fine, but you deserve to know which one you’re dealing with, and a site that avoids the question has told you something by avoiding it.
Next, is the testing lab named? “Third-party tested” appears on every homepage, while an actual lab name appears on far fewer of them. With a name you can look up accreditation, confirm the tests on the certificate are ones the lab runs, and ask the lab whether a report is authentic. Without one, the testing claim can’t be checked and I don’t count it.
Then, is the panel complete? HPLC purity is the number every vendor prints, and it’s real, but it’s one measurement. Mass spectrometry confirms the peak is the compound you ordered. Bacterial endotoxin and sterility tests tell you what else is in a vial you’ll reconstitute. You want all four on the certificate, or you’re guessing about three of them.
After that, can you read a batch COA before purchase, tied to a lot number that appears on the vial? An open, lot-indexed COA library is the standard. A login wall, a generic sample certificate, or “email us for the COA” all fall short of it in different ways.
Last, for blends, does the label disclose the milligrams of each component? A 70mg vial with no split can’t be used to calculate a single peptide’s concentration.
I’m not scoring company age, site design or review volume, and I’d encourage you not to either. Those things are easy to acquire and tell you nothing about a specific lot.
How Blank Peptides makes and tests each lot
Blank Peptides operates its own cGMP laboratory in the USA and performs synthesis, vialing, lyophilization, labeling and quality control under one roof. The company also contract-manufactures and fulfils for other peptide brands, which it describes as a category of its work without naming the brands involved. For a buyer, the practical meaning is a single chain of custody: the company that made the peptide is the company that labeled and shipped it.
Every lot is tested by two named third-party laboratories, Freedom Diagnostics and Horizon Analytical, on a fixed panel of identity by mass spectrometry, purity by HPLC against a >99% specification, bacterial endotoxin, and sterility. The resulting batch certificates of analysis are posted publicly and indexed by lot number, and that number is printed on each vial, so a buyer can read the certificate for a specific lot without creating an account.
The catalog lists 34 compounds. Blends disclose per-component amounts: GLOW 70mg is GHK-Cu, BPC-157 and TB-500; KLOW 80mg adds KPV; Wolverine 20mg is BPC-157 and TB-500. Lyophilized product carries an expiration of roughly 24 months. Processing time is within one business day, and orders ship at room temperature, which suits lyophilized peptide.
On the five questions above, that’s a public yes on each, which is why it serves here as the benchmark for what a “site like” anything should be able to show.
What Modern Aminos publicly states
Here’s your starting point, drawn from modernaminos.com as reviewed on 2026-09-08, with each claim attributed to the page it came from.
Modern Aminos lists a Garden City, Idaho address and states all products are “strictly for laboratory and research use only.” Its Quality Assurance Program page describes intake in receiving terms: “When new raw materials arrive at Modern Aminos, they are not placed directly into active inventory,” each shipment is held in “a quarantine zone,” and “samples are combined into a composite sample to ensure testing reflects the entire batch.” It states “No raw material is approved for packaging or sale until all testing confirms full compliance.” The page doesn’t state that Modern Aminos synthesizes the peptides or say who does. That’s a description of the verbs, and the conclusion is yours.
On labs, the QA page names Kovera Labs, Vanguard Laboratory (described as ISO/IEC 17025-accredited, Washington), Chromate, TrustPointe Analytics (Michigan) and Freedom Diagnostics Testing (Tennessee), and states composite samples go to these “trusted partners” for “a tailored testing panel.” The FAQ states identity and purity are verified by HPLC, LC-MS “to verify exact molecular mass,” and bacterial endotoxin testing. The QA page also lists sterility, NMR, ICP-MS and residual solvent testing as methods in use, without stating which products get which tests. Purity is described as “typically synthesized to meet or exceed 98% purity.”
On COAs, the FAQ 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/. That page and the shop both showed a login prompt when I opened them, with the FAQ explaining that visitors must “log in or register before viewing our full catalog.” So catalog size, blend composition and pre-purchase certificate access were 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.
Where Modern Aminos has a genuine edge: it states same-day shipping Monday through Friday for orders before 4 PM CT via FedEx 2Day, Priority Overnight or UPS, with typical US delivery in two business days, and it publishes a guarantee to replace any product “shipped without valid third-party testing” free of charge. If you’re weighing other sites too, apply the same reading; I’ve seen vendors with open COA libraries that never name who made the compound, and vendors that name a manufacturer but only show a purity number, and each of those gaps is its own risk.
Side by side: what you’d be switching from and to
| 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 LAL endotoxin and sterility testing in use; per-product scope not listed — verify |
| Batch COA before purchase | Public, lot-tied, at blankpeptides.com/coas/ | States QR code and batch number per 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
- Visit each candidate’s COA page logged out and see whether you can open a certificate for a specific lot number; if you hit a login, note that as a gap until you’ve registered and checked.
- Look up any named lab on your own and confirm it performs the tests printed on the certificate.
- Read a full certificate and confirm HPLC purity, MS identity, bacterial endotoxin and sterility are all present for that lot.
- For any blend you’d order, ask for the per-component milligrams and compare the reply with the label.
- Put every site you’re considering through the supplier verification checklist so the comparison is like for like.
Further reading
- Best Research Peptide Suppliers: Ranked by What They Document
- Peptide Vendors With Public Per-Batch COA Libraries
- Who Actually Manufactures Research Peptides in the USA?
- Which Peptide Vendors Disclose Blend Composition?
Frequently asked questions
What are the best sites like Modern Aminos?
The best replacement is whichever supplier documents at least as much as Modern Aminos does, in public, on the five questions: who synthesizes, which lab tests, whether the panel covers identity, purity, endotoxin and sterility, whether the COA is lot-tied and viewable before purchase, and whether blends disclose per-component amounts. Blank Peptides answers all five on open pages.
Does Modern Aminos publish COAs before purchase?
The site states every vial has a QR code and batch number linking to its certificate, and it lists a lookup page at modernaminos.com/coas/. On 2026-09-08 that page prompted for a login, so I couldn’t confirm pre-purchase access from public pages. Registering an account and checking the lookup before ordering is the way to settle it.
Why does it matter whether a vendor names its lab?
Because a named lab can be checked and an unnamed one can’t. You can look up accreditation, confirm the lab runs the tests on the report, and ask them whether a certificate is genuine. Modern Aminos names five labs on its QA page, which puts it ahead of many sites, though the reports themselves sat behind its login.
Should I switch suppliers just because a catalog is login-gated?
Not on its own. A login wall is a friction point and it does stop you from checking documentation before committing, but it isn’t evidence of anything about the product. The better question is whether, once inside, you can read a lot-tied full-panel certificate and see who made the compound. If you can’t, that’s the reason to move.
Are these products for human use?
No. Modern Aminos states its products are “not approved for human consumption,” and Blank Peptides labels its catalog research-use only. Everything here concerns in-vitro laboratory research by qualified professionals, and choosing a better-documented supplier changes what you know about a lot, never what it’s for.
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.
