Is Caslo Legit? Caslo Peptide Brand Review
Is Caslo legit? CASLO is a Danish maker of custom research peptides that works by emailed quotation, and on September 29, 2026 caslo.com presented it as CASLO ApS, based at the Technical University of Denmark's science park near Copenhagen. It sells to universities, research institutes and companies, and says plainly that it does not deliver to personal addresses. We describe what its pages say and leave the verdict to you.
The direct answer from the site: CASLO names a Danish limited company, a street address, a phone number and an email that it promises to answer within 24 hours. Orders begin with a quotation that includes express courier delivery, peptides ship with HPLC and mass spectrometry certificates from the order itself, and delivery carries a money-back guarantee. What the site does not publish is a price list, written terms of sale or a named outside lab.
Our home board is ordered by what brands bid; CASLO’s review here carries no rank.
What caslo.com publishes today (checked September 29, 2026)
| Item | What we saw | Page |
|---|---|---|
| Research-use statement | FAQ: “CASLO only delivers products for research, not for clinical use.” Customers are described as academic groups and biopharmaceutical companies. | FAQ, About |
| Certificates or testing page | No public certificate library; this is made-to-order work. The home page says peptides are delivered with HPLC and mass spectrometry certificates, and the FAQ says each certificate gives the theoretical and measured molecular weight and dissolving guidance. | Home, FAQ |
| Named testing lab | None named. The about page says CASLO “collaborates closely with a range of specialized laboratories” without naming them. | About |
| Contact route | [email protected], telephone +45 70 23 28 60, and post; emails answered within 24 hours. The contact page carries a GDPR privacy statement, including deletion of contact data within five working days on request. | Contact Us |
| Shipping policy | Quoted prices include handling and express courier delivery. Delivers to most countries, but only to research institutions, universities, companies and similar organisations, never to personal addresses. | FAQ, Home |
| Refund or returns policy | No refund page. The home and about pages state a “money back guarantee” and a product guarantee for delivered peptides, without written conditions. | Home, About |
| Company name or address | CASLO ApS, c/o Technical University of Denmark, DTU-Science Park, Diplomvej 381, DK-2800 Kongens Lyngby, Denmark. The about page gives a 2005 start and mentions a Gazelle award from the business paper Børsen. | Home, About |
| Product range | Custom made peptides to the customer's sequence, from crude grade to high purity grades, in quantities from milligrams to multiple grams, with modifications such as carrier protein and fluorochrome conjugation. | Home, FAQ |
In sentences: caslo.com gives a registered company form (ApS is a Danish private limited company), a science park address, phone, email and post, and a clear rule that it ships only to organisations for research. Quality paperwork arrives with each order rather than being posted online, the guarantee is stated without conditions, and no terms of sale page exists on the pages we loaded. The privacy statement cites the Data Protection Act 1998, a UK law, alongside the EU GDPR.
Reading the public signals
CASLO's public pages read like those of a small specialist supplier that has been around for two decades: a real address inside a university science park, a phone line in Denmark, and FAQ answers that go into counterions, solubility and storage in a way only a producer would bother to write. The about page's claim that CASLO peptides appear in more than a thousand published articles comes with an offer to send a reference list, which is a claim you can actually test.
What is thin is anything written down about money. There is no price list, which is normal for custom work, but also no terms of sale, and the money-back guarantee has no stated conditions or time limit. For an institutional buyer, that makes the quotation itself the contract, so it needs to carry the terms.
One practical consequence of the institutions-only rule: a private individual cannot order from CASLO at all, so any seller offering CASLO peptides to consumers is outside what this company describes.
Applying the checks to Caslo
- Check the company register. Look up CASLO ApS in the Danish Central Business Register (CVR) and confirm the Kongens Lyngby address.
- Ask for the reference list. The about page offers one; a few named publications are an easy way to test the thousand-article claim.
- Put the guarantee on the quote. Ask for the money-back conditions and time limit to be written into the quotation.
- Specify the certificate content. Ask that the HPLC trace and the mass spectrometry result for your exact sequence ship with the order.
Our peptide COA guide explains how to read an HPLC and mass spectrometry certificate like the ones CASLO describes.
FAQ
Is Caslo legit?
We do not issue that verdict. On September 29, 2026 caslo.com named CASLO ApS at the DTU Science Park in Kongens Lyngby, Denmark, with a phone number and email, and described quote-only custom peptides delivered by express courier to organisations only. It states a money-back guarantee but publishes no terms of sale.
Does Caslo publish third party testing?
Not online. CASLO says each order ships with HPLC and mass spectrometry certificates and names no outside lab; the about page mentions unnamed partner laboratories. Ask for the certificate content and its source to be specified on your quotation.
Is Caslo ranked on the BestPeptideBrand board?
No rank comes from this page. The board shows paid listings in bid order, and a Danish custom supplier appears there only by bidding like any other brand.
Sources
Every page below was loaded on September 29, 2026 with a standard browser request.
- CASLO home page (caslo.com), checked September 29, 2026
- About (caslo.com/about-us), checked September 29, 2026
- Contact Us (caslo.com/contact-us), checked September 29, 2026
- FAQ (caslo.com/frequently-asked-questions), checked September 29, 2026
Independent transparency review built from the public pages listed under Sources, loaded on September 29, 2026. Caslo has no relationship with this site unless it holds a listing on our board, which is paid placement ordered by bid amount only. This page asserts no wrongdoing and makes no purchase recommendation. Nothing here is medical advice. Corrections: see the site contact page.