Peptides are short chains of amino acids that act as building blocks of proteins.

Please use the BAC Water Calculator to determine how much bacteriostatic water to add to your peptide.

Check out our reconstitution guide, or use the Peptide Calculator to get exact draw amounts for your syringe.

Lyophilized peptides are stable for months when frozen. Once reconstituted, refrigerate and use within the timeframe noted on your COA.

Store lyophilized vials in a freezer for long-term stability. After reconstitution, keep refrigerated and protected from light.

We provide peptides for research purposes only and do not give out any medical advice. Please conduct independent research or speak to a licensed medical professional.

Our peptides are lyophilized (freeze dried) for shelf stability during shipping and handling, to ensure they arrive at maximum potency. They require bacteriostatic water for research use.

All of our peptides are sourced from vetted, quality-controlled synthesis partners with documented manufacturing standards.

We ship daily Monday through Saturday. All orders placed before 1pm ship the same day. All orders ship with FedEx 2-Day Air. Please note we cannot ship to PO boxes, only commercial and residential addresses.

When your order ships, you will receive an automatic email with a link to track your order with FedEx.

We are only shipping within the US at the moment. Please note we cannot ship to PO boxes, only commercial and residential addresses.

Yes — free shipping is included on all orders over $150.

All orders are shipped in discreet, unmarked packaging with vials individually cushioned to prevent breakage during transit.

All of our products undergo rigorous third-party mass spectrometry testing with Janoshik Analytical.

You can view all of our current active COAs on our Testing page as well as at the bottom of the product page for the peptide.

Please go to janoshik.com/verify and enter the task number and unique key found on your COA. Please note that this is a different code than the batch numbers we use internally to track batches.

All Prime Peptides research compounds are manufactured to ≥99% purity and independently verified before listing.

Our office is located in Southern California.

We are happy to accept returns of unopened vials within a month of purchase. To initiate a return request, log in to your account using the same email address used at checkout, navigate to My Account → Orders, and click Return Request next to the relevant order. Our team will respond within 1–2 business days. We will issue a full refund once we receive the return package and can restock the inventory.

We are always happy to make things right in this situation — please submit the Exchange Request Form and we will send a replacement in 1–2 business days.

Our team is available by chat, phone, and email. Use the Contact page and we will respond within one business day.