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Peptides are short chains of amino acids, the fundamental building blocks of proteins. Typically containing between 2 and 50 amino acids, peptides are smaller than proteins and act as critical signaling molecules in the body, directing cells to perform specific tasks like regulating hormones or repairing tissue.

Batches submitted for third-party analysis have their certificates of analysis published on our COA page. Certificates are added as testing is completed, so coverage varies by product and batch.

Lyophilized peptides should be kept in a freezer. Once reconstituted, store refrigerated and use within the recommended window.

Orders placed before 12pm CST will be shipped same day via USPS.

Due to the highly sensitive chemical nature of laboratory reagents and reference standards, all sales of PX Research LLC products are final. To maintain strict laboratory safety protocols and prevent cross-contamination, we absolutely cannot accept returns, exchanges, or refunds of opened, unsealed, or altered product vials under any circumstances. By completing your purchase, you acknowledge and agree that these products are raw chemical reagents and cannot be returned. If a shipment arrives physically damaged, broken, or incorrect due to a transit error, the buyer must contact our support team within 48 hours of delivery with photographic evidence to request a complimentary replacement shipment.