Peptide.Express: Research Peptides for Laboratory Use

Peptide.Express sells research peptides for laboratory use and ships within the United States. Processing times, free-shipping thresholds, and carrier options are on the shipping policy page. Third-party Certificates of Analysis are listed by batch where on file. View the CoA library in the lab results index. International shipping is not offered. For laboratory research use only. Not for human or veterinary use.

Testing methodology for research peptides supplied by Peptide.Express: HPLC purity against a ≥99% sourcing specification, reported by an independent third-party laboratory, with identity confirmation and appearance where the laboratory reported them. Certificates of Analysis are published in the lab results library for products that have one on file. For laboratory research use only. Not for human or veterinary use.

No. The ≥99% figure is the purchasing specification Peptide.Express buys to before a batch is accepted. It is not a measurement of any individual vial. A measured purity figure exists only for a batch a laboratory has actually run, and it is published on that batch Certificate of Analysis. Spec and vial result stay separate on this site. For laboratory research use only. Not for human or veterinary use.

In-vitro laboratory research and educational use only. Nothing sold by Peptide.Express is intended for human consumption, clinical administration or veterinary use. Research-use-only material is not manufactured under the pharmaceutical GMP requirements that govern drug products and is not sterile-filled for administration. No regulatory body has approved it for use in humans or in animals.

A CoA is a batch document rather than a product document. Each one carries the lot number, the HPLC chromatogram and the purity figure integrated from it, the LC-MS/MS mass confirmation, appearance and solubility notes, the endotoxin result, the test date and the name of the laboratory that ran the analysis. Two vials of the same compound from two synthesis runs have two different certificates, so the lot number on the vial has to match the lot number on the document before anything else on it applies.

Research peptides are legal to purchase in the United States for legitimate laboratory research, and in most cases no special license is required. Some compounds are subject to jurisdiction-specific rules, and confirming local law before ordering sits with the buyer. Purchase carries an agreement that the material stays in a research context.

At -20°C, desiccated and protected from light, for long-term storage. For anything under 30 days, 2-8°C is acceptable. Vials stay sealed until reconstitution because the lyophilized cake is hygroscopic and begins pulling atmospheric moisture as soon as it is exposed to air. Stored properly at -20°C, 24 months from manufacture is the standard shelf life across this catalog.

Reconstituted in bacteriostatic water and held at 2-8°C away from light, the working window is generally 14 to 28 days. The upper end of that range tracks the USP 28-day multi-dose limit for benzyl-alcohol-preserved vials rather than the chemical stability of any particular peptide. A solution that has turned cloudy or discoloured, or that carries visible particulate, is finished regardless of what the calendar says.

All orders ship from within the United States. Same-day dispatch on business days (orders before 2 PM EST). Orders placed after 2:00 PM EST may be processed the next business day. USPS Priority Mail typically arrives 3–5 business days from the ship date; expedited options are at checkout. Free standard shipping applies to qualifying US orders over $150. Compounds ship as lyophilized powder in sealed vials inside a plain outer carton that carries no product information. For laboratory research use only. Not for human or veterinary use.

No. No compound supplied by Peptide.Express is an FDA-approved drug product. A few of the molecules exist in approved pharmaceutical form under other manufacturers: tesamorelin is approved as Egrifta, and tirzepatide is approved under brand names. An approved drug product and a research-grade compound of the same molecule are different products made to different standards, and the approval attaches to only one of them. Retatrutide is investigational and is approved for no indication anywhere.

Several. BPC-157, TB-500 and MOTS-c fall under the non-approved-substance and peptide-hormone sections and are prohibited at all times. GHRH analogs and growth hormone secretagogues, including tesamorelin, CJC-1295, ipamorelin and sermorelin, fall under S2. Enclomiphene falls under S4 as a selective estrogen receptor modulator. The Prohibited List is revised annually, so competitive athletes and the people advising them should read the current version rather than any vendor summary.

Length, and what length does to structure. Peptides run short, conventionally under about 50 amino acids, and generally lack the folded tertiary structure a protein depends on for its function. The boundary is a convention rather than a hard chemical line: insulin at 51 residues sits on it and gets called both. The practical consequence is that a peptide can be assembled residue by residue on a solid-phase resin, while a protein of the same sequence usually has to be expressed in a living system.