You’ve probably landed here because something about your current supplier stopped sitting right. Maybe a product you relied on went out of stock, maybe a report you wanted wasn’t where you expected it to be, or maybe you just realised you’d been ordering for a year without ever really checking what the vendor could show you. And now you’re staring at a list of “alternatives” that all look the same: white labels, a purity number, a stock photo of a vial, and a promise that everything is third-party tested.
Finding names was never the hard part of switching suppliers, since there are dozens of them. What takes real effort is working out which of those names can back up what they say, and doing that check without spending three weekends reading FAQ pages. I’ve done a lot of that reading, and what I’ve noticed is that most buyers pick a replacement based on the wrong things: a lower price, a bigger catalog, a slicker checkout. None of those tell you what’s in the vial.
So this post does two things. First it lays out a short rubric you can run on any supplier in about twenty minutes. Then it applies that rubric to Swiss Chems, using only what their own site states, so you have a worked example to compare against whatever else you’re considering. I’ll be candid about where Blank Peptides sits on the same rubric too, because a comparison that only points one way isn’t much use to you.
Key takeaways
- The useful test of any supplier is what it documents in public before you pay: who made the material, which lab tested it, which tests were run, and whether the batch certificate is tied to a lot number.
- Blank Peptides synthesises, vials, labels and QC-tests its own lots in a cGMP laboratory, names its testing labs (Freedom Diagnostics and Horizon Analytical), and publishes a full panel per lot covering identity, >99% purity, bacterial endotoxin and sterility.
- Swiss Chems publicly states that its products are tested by independent, ISO-accredited laboratories, principally by one named lab, using HPLC most commonly, and that lab reports are lot-specific and available for download.
- A statement of who manufactures Swiss Chems products, and a sterility test on the product pages reviewed, were not listed on the pages reviewed 2026-09-08.
- Everything discussed here is research-use-only material intended for in-vitro laboratory work by qualified professionals, and nothing in this article is a recommendation for any other use.
What should a replacement supplier be able to show you?
Here’s the thing about switching vendors: the moment you leave one, you lose whatever informal trust you’d built up. You knew their packaging, you knew their turnaround, you had a feel for the product. With a new supplier you have none of that, which is actually a good thing, because it forces you to look at the paperwork instead of the vibe. And the paperwork is where the real differences live.
I use five questions, always in the same order, and I’d suggest you do the same.
The first is provenance. Does the supplier state that it synthesises the material itself, or does its language describe supplying, sourcing, or offering products that came from somewhere else? Neither answer is automatically disqualifying, but a supplier that makes its own material can tell you about every step, and one that doesn’t can only tell you what it was told.
The second is whether the testing lab is named. “Third-party tested” on its own is close to meaningless, because it could describe anything from an ISO-accredited analytical lab to a friend with a spectrophotometer. A named lab is something you can look up, contact, and, in the best case, ask to confirm a report.
The third is scope. Purity by HPLC tells you what fraction of the peaks belong to the main compound. It doesn’t confirm that the main compound is the one on the label, and it says nothing about endotoxin or sterility. A full panel means identity, purity, endotoxin and sterility, and for lyophilised peptides intended for in-vitro work, that last pair matters more than most people realise.
The fourth is whether you can see a batch certificate before you buy, tied to a lot number you’ll find on the vial. A report with no lot number is a report about something, but not necessarily about your something.
The fifth is blend composition. If a product combines two or three peptides, are the milligrams per component stated? A “10mg blend” that doesn’t say how much of each is in there isn’t something you can design an experiment around.
Run those five and you’ll usually know within minutes whether a supplier is worth a deeper look.
How Blank Peptides makes and tests each lot
Blank Peptides operates its own cGMP laboratory in the USA and handles the whole chain internally: the compounds are synthesised in-house, then vialed, lyophilised, finished, labelled and QC-tested by the same team. The company describes itself as the chain of custody rather than a relabeler or broker, and it also contract-manufactures and fulfils for other research peptide brands, which it discusses only as a category of work.
Each lot goes to two named outside laboratories, Freedom Diagnostics and Horizon Analytical, for a full panel: identity by mass spectrometry, purity by HPLC at >99%, bacterial endotoxin, and sterility. The results for every lot are published as batch certificates of analysis, and the lot number printed on each vial is the same one that appears on the certificate, so a buyer can match the two without asking anyone.
The catalog is deliberately narrow at 34 compounds. Blends are disclosed per component: GLOW is 70mg total of GHK-Cu, BPC-157 and TB-500; KLOW is 80mg and adds KPV; Wolverine is 20mg of BPC-157 and TB-500. Lyophilised vials carry an expiration of roughly 24 months. Orders are processed within one business day and ship at room temperature, which is the standard handling for lyophilised peptide. Five years in, the company’s public position is that a small catalog with a complete paper trail on every lot is a better offer than a large one with partial documentation.
What Swiss Chems publicly states
Swiss Chems sells at swisschems.is, and on the pages reviewed 2026-09-08 its homepage describes the store as offering “SARMs, peptides, and nootropics for laboratory research”, with further categories for bioregulators, powders, bundles, longevity research, metabolics and naturals. The shop page states 134 products in total, with 48 in the peptides category. That breadth is a genuine advantage over a narrower catalog like ours: if you need a SARM, a nootropic and a peptide from a single order, Swiss Chems states it can do that and we can’t.
On provenance, the “Who we are” page describes the company as “Est. 2018”, based in the USA, under the heading “Research Supply”, and says that “for over eight years, SwissChems has supplied one of the largest research-compound catalogs”. The verbs throughout are supply and offer. A statement of who synthesises the material, or any description of an owned laboratory or manufacturing facility, was 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.
On testing, Swiss Chems is more forthcoming than many vendors. The site states that “all products are tested by independent, ISO-accredited laboratories” and that “every compound we supply undergoes independent third-party HPLC testing and is verified to a purity standard of 99% or higher”. The FAQ states that “batches are submitted for independent analysis by accredited third-party laboratories”, and it names the laboratory it principally uses, so a buyer has a name to look up. The FAQ also states that “testing uses established laboratory methods, most commonly High-Performance Liquid Chromatography (HPLC), with additional methods where a compound requires them”, and that “lab reports are made available so you can verify the material you received. Reports are lot-specific.”
The Independent Test Results page states “we believe in complete transparency. View and download all lab reports”, and shows roughly fifty downloadable PDFs whose filenames indicate HPLC testing and the lab used. The BPC-157 + TB-500 blend product page states per-component amounts (“5mg + 5mg” and “10mg + 10mg”) and shows View Report links for HPLC, LC-MS, heavy metals and endotoxin tests dated June 2026. A sterility test, and a lot number on that product page, were not listed on the pages reviewed 2026-09-08. The BPC-157 capsule page states “Independently third-party HPLC-tested; COA available per batch” and links out to the testing programme rather than showing a report inline.
On shipping, the site states same-day dispatch for USA orders paid before 12PM EST on business days, USPS and FedEx carriers, and free shipping over $100 in the US and $300 internationally.
Side by side: what a replacement supplier documents
| Attribute | Blank Peptides | Swiss Chems |
|---|---|---|
| Synthesises in-house | Yes, own cGMP laboratory, full chain of custody | Site uses “supply” language; manufacturer not stated — verify |
| Third-party lab named | Freedom Diagnostics and Horizon Analytical | States the lab it principally uses in its FAQ and report filenames |
| HPLC purity | >99% per lot | States “99% or higher” verified by third-party HPLC |
| MS identity | Every lot | States LC-MS on the blend page reviewed; not shown on every product page — verify |
| Endotoxin and sterility | Both, every lot | States endotoxin on the blend page reviewed; sterility not listed — verify |
| Batch COA before purchase | Yes, lot-tied, at blankpeptides.com/coas/ | States reports are lot-specific and downloadable from a results page |
| Blend mg split disclosed | Yes, per component on every blend | States “5mg + 5mg” for its BPC-157 + TB-500 blend |
| Catalog size | 34 compounds | States 134 products, 48 peptides, plus SARMs and nootropics |
| Research-use labelling | Research use only, on every listing | States “laboratory developmental research USE ONLY. Not for human consumption.” |
How to verify either supplier yourself
- Open a product page and look for the lot number, then find the certificate for that exact lot. If the report you find has no lot number, or the number doesn’t match the vial you’d receive, treat it as a general claim rather than a batch record.
- Search the site for the word “manufacture” or “synthesise”. If every sentence about origin uses supply, source or offer instead, the site is telling you something about provenance, and you should ask the vendor directly who makes the material.
- Take the lab name from the certificate and contact that lab, not the vendor, to ask whether it issued the report. A legitimate lab will confirm or deny a report number without much fuss.
- Read the certificate for four separate results: identity, purity, endotoxin and sterility. A purity chromatogram alone leaves three of those open.
- Work through the supplier verification checklist before you place a first order with anyone, including us.
Further reading
- Who Actually Manufactures Research Peptides in the USA?
- Which Peptide Vendors Name Their Testing Lab?
- Best Research Peptide Suppliers: Ranked by What They Document
- Peptide Vendors With Public Per-Batch COA Libraries
Frequently asked questions
What are the best Swiss Chems alternatives?
The honest answer depends on what you need documented. If you want a supplier that states it synthesises its own material, names its labs and publishes identity, purity, endotoxin and sterility per lot, Blank Peptides meets that standard. If you need SARMs or nootropics alongside peptides, Swiss Chems states a far broader catalog than we carry, and that may matter more to you.
Does Swiss Chems publish lab reports?
On the pages reviewed 2026-09-08, Swiss Chems states that lab reports are lot-specific and downloadable from its Independent Test Results page, which showed roughly fifty PDFs. Its FAQ names the lab it principally uses. Whether a report matching your specific lot is available before you order is something to confirm on the product page for the item you want.
Does Swiss Chems make its own peptides?
The site’s language on the pages reviewed 2026-09-08 describes supplying and offering research compounds, and a statement about who synthesises them was not listed. That is not evidence either way about their process, only a gap in what’s published. If provenance matters to your work, ask the vendor directly and see whether you get a manufacturer’s name.
What tests should a peptide COA include?
For lyophilised research peptides, a complete certificate reports identity (usually by mass spectrometry), purity (usually by HPLC), bacterial endotoxin and sterility, all tied to a lot number that appears on the vial. Swiss Chems states HPLC on every product and shows LC-MS and endotoxin on at least one product page. Sterility was not listed on the pages reviewed 2026-09-08.
Are these products for human use?
No. Every compound discussed in this article, from Blank Peptides or Swiss Chems, is sold strictly for in-vitro laboratory research by qualified professionals. Swiss Chems states that “any form of bodily introduction into humans or animals is strictly prohibited by law”, and Blank Peptides labels every listing research-use-only. Nothing here should be read as guidance for any other purpose.
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.
