Peptide.Express

Catalog and purity claims read from the live site today. peptide.express is a US-facing Next.js storefront; /feed/products.xml lists 24 items (peptide vials, two blends, a Mitochondrial Fuel Stack, a BPC-157 plus TB-500 two-compound kit, one nasal spray, bacteriostatic water; no oral-tablet item appears anywhere in the feed). The retatrutide product page at /catalog/retatrutide sells under the house code GLP3-RETA in six size variants (5, 10, 15, 20, 30, 60mg), embedded in the page as a JSON product-state block rather than plain HTML, so the true per-variant list price, discounted price and stock count had to be read from that block rather than the visible page text. For the 10mg variant: list price 85.00 USD, discounted (sale) price 65.00 USD, 30 units in stated stock. The site-wide sourcing standard printed on the product page and repeated in the footer strap is a purity figure of 99 percent or greater by HPLC, with LC-MS/MS cited alongside as the identity-confirmation method (mass matched against the compound's stated 4,731 Da). The About page (/about) states in its own words that in-house purity testing is not performed at all, that verification is by an independent third-party laboratory, and that a batch-specific Certificate of Analysis ships with every order. Endotoxin testing is claimed sitewide as an LAL (Limulus Amebocyte Lysate) method on the technical-specifications table, though see the next entry for how that claim holds up against the actual certificates on file for retatrutide.

Certificates for retatrutide, read from https://peptide.express/lab-results (the public CoA index) cross-checked against the JSON product-state block on /catalog/retatrutide and against the linked documents themselves. The product-state block gives each in-stock retatrutide size its own certificate: 10mg is accession 96921, 15mg is 23541, 20mg is 23018, 30mg is 79262 (30mg carries zero stock as read); the 5mg and 60mg variants carry no certificate link at all (coa_pdf_url and coa_lab_url both null in the data). All four linked certificates resolve, both as a static document at https://mistraldiagnostics.com/coa/{id} and through a separate live HTML page at https://mistraldiagnostics.com/verify?id={id}; fetching the 10mg document (accession 96921) directly from the lab's own domain returned: received 5/4/2026, reported 5/5/2026, lot 0100225, net peptide content 10.28mg, identity Retatrutide, purity 99.830 percent, chromatogram peak at 6.34 minutes. That is a real, lot-specific document. But the public index card for this exact product, titled 'GLP3-RETA 10mg' on https://peptide.express/lab-results, prints 'Not recorded' against Batch, Tested (date) and Testing lab, and prints 'Not recorded' again against Purity and Net content in its own figures table, despite linking to the same accession 96921 document that carries all five of those figures. Mistral issues two different certificate layouts across these documents. On the older layout (accessions 73912, 96921 and 79262) the index card's blanks for endotoxin, sterility and a fentanyl screen are accurate, since that template carries none of those lines; but the newer layout used for 23541 (the 15mg card) and 23018 (the 20mg card) does carry a bacterial endotoxin line against USP <85> and a fentanyl immunoassay line at a 50 ng/mL cutoff reading Not Detected, with 23018 adding an elemental-impurities panel by ICP-MS, so the 15mg and 20mg index cards' 'Not recorded' against endotoxins and 'No screen on file' against a fentanyl screen understate documents that carry both lines. The method contradiction is likewise confined to the older layout: on 73912, 96921 and 79262 the table header states 'All Chemical Analysis was performed by HPLC-UV', while the boilerplate paragraph beneath the signature block states the analysis 'was conducted using LC-MS/MS'; the newer layout on 23541 and 23018 instead prints one combined METHOD field ('HPLC-UV , LC-MS' and 'HPLC-UV + LC-MS' respectively), attributes its purity figure to a Peptide Purity (HPLC) line, and carries no contradicting closing paragraph. Neither peptide.express's own pages nor the certificates name the laboratory anywhere in prose; the only place the name 'Mistral Diagnostics' appears is as the letterhead on the PDF itself and as the bare domain text 'mistraldiagnostics.com' on the index cards.

The testing laboratory checked on its own site. mistraldiagnostics.com resolves live, gives a Dallas, TX 75247 address (no street address, suite or phone number published anywhere on the homepage), and states 'Est. 2016'. Its accreditation line reads 'ISO/IEC 17025 Compliant', which is a self-declared conformance claim rather than an accreditation claim; the homepage does not name an accrediting body (no A2LA, no ANAB) and no certificate number is shown. The site advertises a verification portal ('Every Certificate of Analysis is issued with a unique reference ID... instantly verify authenticity') and the record behind that portal is reproducible from the lab's own domain, though not through the portal page itself under a stateless fetch: https://mistraldiagnostics.com/verify?id=96921 serves a client-rendered application shell whose figures never appear in the served HTML, and the page's own script calls the lab's /api/test/{id} endpoint. Requesting https://mistraldiagnostics.com/api/test/96921 directly, independently of anything on peptide.express, returned the same lot 0100225, the same 99.830 percent purity figure on the document's own HPLC purity line and the same 10.28mg net content that the peptide.express-linked document showed, as did the document itself at https://mistraldiagnostics.com/coa/96921, so the certificate is reproducible from the laboratory's own domain and not merely an image peptide.express controls.

Shipping, payment and entity details read from /shipping, /terms and /privacy. Shipping is stated as United States only ('We currently ship within the United States only (all 50 states and territories)... International shipping is not available at this time'), free over 150.00 USD, otherwise a 7.95 USD flat USPS Priority Mail rate, with expedited USPS and UPS options priced separately; no P.O. Box delivery for expedited service. Payment is processed through Stripe ('Payment is processed securely through Stripe. Peptide.Express does not store full credit card numbers'); no other payment method (no Zelle, Venmo, wire or cryptocurrency) is named on the shipping, terms, privacy, contact or checkout-adjacent pages fetched. All sales are stated final; no returns are accepted on shipped product, with a narrow 48-hour damaged-or-incorrect-item exception resolved at the seller's sole discretion by replacement or store credit, refunds to the original payment method being described as exceptional rather than standard. On entity and contact: no registered legal name (no LLC, Inc or similar suffix), no physical business address and no phone number appear anywhere across /about, /contact, /terms or /privacy; the only contact channel published is the email support@peptide.express and a contact form, with stated business hours Monday through Friday, 9am to 5pm Eastern. The Terms of Service set a minimum buyer age of 18 and state the governing law as 'the laws of the United States' without naming a specific state, with disputes routed to binding arbitration and a class-action waiver.