What we checked (13 October 2026)
Where Werhner Lab's certificates come from
- The shop's CoA library lists nine peptides and a bacteriostatic water. Four of the peptides have a certificate, and all four are from Convalence Labs: LAB-2026-0124 (Retatrutide 15 mg, batch RT15-7741), LAB-2026-0127 (tirzepatide 20 mg), LAB-2026-0130 (Glow 70, a three-peptide blend) and LAB-2026-0132 (tirzepatide 10 mg). The other five peptides are marked pending.
- The two certificates we ran through Convalence's own verification page, 0124 and 0127, came back as authentic. That confirms Convalence issued them. It doesn't show that Convalence is independent of the shop.
What Convalence Labs discloses
- Its site says the lab opened in 2026. convalencelabs.com was registered on 5 August 2026, and its terms and privacy policy are dated 9 August 2026.
- It gives no company name, no address beyond Spain, no tax ID (NIF) and no company-registry entry. Spain's e-commerce law, Ley 34/2002 (article 10), requires a business established in Spain to publish its name, address, email and tax ID on its website, plus its registry entry if it has one.
- None of the pages we read claims an accreditation such as ISO/IEC 17025. The round seal on its certificates says certified without naming who certified it.
- Its site and certificates say it sells no products and has no financial interest in any result.
- It names three analysts, shown with initials instead of photos. In web searches we found no mention of the lab outside its own site and the certificates Werhner Lab hosts.
- It takes Bitcoin only.
- It is not CoValence Laboratories, a US skincare manufacturer with a similar name.
What the lab and the shop share
- Both domains were registered through Cloudflare's registrar, both list the registrant's region as Alicante, Spain, and both use the same pair of Cloudflare nameservers. werhnerlab.com was registered on 24 August 2026, 19 days after convalencelabs.com.
- Cloudflare's documentation, Nameserver options, says it tries to give every domain in one account the same nameserver names. A shared pair is consistent with one account behind both sites. On its own it doesn't prove that.
- Anyone can check both registrations at ICANN Lookup.
Where the shop's pages and the certificates disagree
- The shop says no batch is sold without a certificate. Five of its nine peptides have none in its library, and four of those five are in stock.
- Every peptide's product card carries a verified-CoA badge and a test date in August 2026. None of those dates matches a certificate: retatrutide 15 mg is shown as tested on 18 August, and its certificate says the sample was received on 15 September and reported on 29 September. All but one of the dates also fall before werhnerlab.com was registered.
- The tirzepatide 20 mg certificate is for batch TR20-3106. The shop lists that product's batch as TZ20-3105.
- The shop says each batch's certificate includes the chromatogram. None of the four does.
What the certificates show, and what they leave out
- Each certificate reports purity, net content (how many milligrams are actually in the vial) and endotoxin (by an LAL test). The retatrutide certificate reads 99.1% purity and 15.6 mg against 15 mg declared, with endotoxin below 0.001 EU/mg.
- All four name HPLC-MS as the identity method. Mass spectrometry confirms the molecule in the vial is the one on the label by measuring its mass, yet none of the four shows a measured mass, a chromatogram, the instrument or the reference standard. A third party has nothing to check. Mass Spectrometry for Peptides explains what that check measures.
- The retatrutide certificate says its LAL result confirms the sample is free of bacterial pyrogen contamination (pyrogens are substances that cause fever). An LAL test detects bacterial endotoxin only, not every pyrogen. Endotoxin Testing for Peptides explains what the test can and can't show.
- The numbers themselves are plausible. On a certificate nobody outside the lab can check, plausible numbers prove nothing either way.
What this means
- We treat these four as unverified certificates, not independent lab tests, and Werhner Lab's page here carries a note saying so. The page has no reviews and no lab tests on file (verified October 2026).
- We are not saying the vials are bad. Nothing independent shows what's in them yet.
Holding a Werhner Lab vial?
- Check that the batch number on your label matches the one on the certificate. Five of the nine peptides have no certificate at all.
- The test that settles it comes from a lab with a public record that doesn't depend on this shop. Where peptides get verified lists the labs with certificates on file here.
- If you get one, Submit a lab test and the result goes on Werhner Lab's page for the next buyer.
Checking any new lab
A certificate that checks out on its own lab's portal proves that lab issued it, nothing more. Before trusting a lab you haven't seen before, look for a named company with an address, customers beyond one shop, and raw data (a chromatogram and a measured mass) on request. How to Evaluate a Peptide Testing Lab's Trustworthiness goes through the checks, and Red Flags in Peptide Certificates of Analysis (CoA) covers the certificate itself.
We'll update this reply if Convalence Labs publishes a company name, NIF and address, if a Werhner Lab vial is tested elsewhere, or if the shop changes its badges, dates or batch numbers. The pages as they stood on 13 October 2026: werhnerlab.com/coa · werhnerlab.com