Answers to the questions researchers most commonly ask about Excalibur Peptides — purity standards, third-party testing, Certificates of Analysis, domestic shipping, storage, and the research-use-only compliance framework that governs every order.
Every compound in the catalog is third-party tested to a minimum of ≥99% purity by reverse-phase HPLC, with identity confirmed by LC-MS against the published molecular weight of the target peptide. Batches that do not meet the ≥99% purity floor are not released for sale.
Each COA records the compound name, the batch (lot) number, the date of analysis, the testing laboratory (named, not anonymous), the analytical methods employed (HPLC, LC-MS), the observed purity percentage, and the observed mass against the calculated mass. The COA is the document a research methods section references when citing peptide source and purity.
No. All purity and identity testing is performed by a named independent third-party analytical laboratory. In-house testing creates a conflict of interest because the same entity that profits from releasing a batch also tests it. Excalibur Peptides uses independent third-party testing for every batch, and the lab name is printed on the COA so it can be cross-referenced and audited.
Through the COA database on this site, accessible without account registration. Researchers can verify a specific lot before placing an order. Archive the COA alongside your experimental records and cite the lot number, vendor name, and COA reference in your downstream publication's methods section.
Orders placed before the daily cutoff ship the same business day. Domestic USA delivery is 2–4 business days via temperature-controlled shipping. International shipping is not currently offered because customs delays and temperature excursions during extended transit compromise cold-chain integrity for lyophilized peptide reference standards.
All compounds ship lyophilized in sealed vials. Packaging is discreet and includes appropriate temperature management for the transit window. Tracking is provided on every order.
Lyophilized peptides should be stored at -20°C, protected from moisture and light, until reconstitution. Reconstituted solutions are typically stored at 4°C and used within the stability window established for the specific compound and the experimental protocol. Repeated freeze-thaw cycles should be avoided to preserve peptide integrity.
No. All Excalibur Peptides products are sold strictly for in-vitro laboratory research and identification purposes. The compounds are not approved by the FDA for human therapeutic use, are not intended for veterinary administration, and are not intended for any clinical application. Buyers are required to certify research-use-only status at checkout.
No. The site does not host reconstitution protocols, dosing calculators, or any form of human-use documentation. Researchers are expected to design their experimental protocols in accordance with the published preclinical literature for the specific compound and the appropriate institutional review process. All experimental decisions are the responsibility of the qualified investigator.
21 years or older. Age verification is required before site access, and additional research-use certification is required at checkout.
Peptide Sciences voluntarily shut down operations in March 2026. Excalibur Peptides is an operational US-based supplier that carries the same core compounds Peptide Sciences was best known for — BPC-157, TB-500, GHK-Cu, Tesamorelin, GHRP-6, NAD+ — with batch-level HPLC and LC-MS testing through a named third-party laboratory. There is no corporate relationship between the two entities; Excalibur is presented as an operational alternative for researchers whose previous supply lines were interrupted by the Peptide Sciences closure.
The catalog uses the research designations GLP-2 T (dual GIP/GLP-1 receptor agonist research peptide) and GLP-3 R (triple GIP/GLP-1/glucagon receptor agonist research peptide). Researchers should cite the catalog SKU, vendor name, batch number, and COA reference in methods sections for reproducibility.
The Wolverine Blend combines BPC-157 and TB-500 in a single research formulation, reflecting the published rationale for combining cytoprotective and actin-sequestration peptides in tissue-repair research designs. The KLOW Blend extends this approach with GHK-Cu and KPV in addition to BPC-157 and TB-500 — a four-peptide formulation for multi-pathway research studies in preclinical models.
Email info [at] excaliburpeptides [dot] com for COA documentation requests, batch-specific verification questions, and order support. The COA database on this site is the primary self-service resource for batch documentation.