Who Can Order

Before you can browse our product catalog, you must confirm via an attestation gate that you are 21 years of age or older and are accessing the Site for legitimate laboratory research purposes. All orders require that same attestation again at checkout, consistent with our Privacy Policy and Terms of Service. We reserve the right to refuse, limit, or cancel any order — before or after it ships — that we reasonably believe is not for legitimate research use, including orders accompanied by requests for dosing, titration, administration, or human or animal use guidance. Nothing in this Policy, and no communication from Prolific Peptides regarding shipping, handling, or storage, should be construed as instructions for human use, dosing, or administration.

Order Processing

Orders placed before our daily cutoff time (posted at checkout) are typically processed and shipped the same business day, subject to product availability. Orders placed after the cutoff, or on a weekend or holiday, are processed the next business day. We may take additional time to review or hold an order for payment verification, fraud prevention, or compliance review — including verification of the attestation in Section 1.

Consistent with FTC mail, internet, and telephone order rules, if we're unable to ship your order within 30 days (or within any shorter timeframe stated at checkout), we will notify you and give you the option to cancel for a full refund or agree to a delay.

Shipping Destinations and Carriers

We currently ship to all 50 U.S. states and Washington, D.C. We do not ship internationally. We ship via USPS and/or a major commercial carrier; the available method(s) and estimated transit time for your order are shown at checkout. We reserve the right to select the carrier and service level used to fulfill your order.

Shipping Costs and Sales Tax

Shipping costs, if any, are calculated and displayed at checkout before you complete your order. Applicable sales tax is calculated based on your shipping address and the states where we are required to collect it, and is shown at checkout prior to purchase.

Delivery Estimates

Any delivery date or timeframe shown at checkout or in a shipping confirmation is an estimate only and is not a guarantee. Actual delivery times may vary due to carrier volume, weather, or other factors outside our control, and we are not responsible for delays caused by the carrier or by events beyond our reasonable control.

Order Changes and Cancellations

You may cancel or modify an order within 1 hour of placing it, or before it has shipped, whichever comes first, by emailing us at the address in Section 13. Once an order has shipped, it can no longer be changed or canceled, and is instead subject to Section 9 (Returns and Refunds).

Title and Risk of Loss

Title and risk of loss for products pass to you upon our delivery of the products to the carrier. Once a package has been handed to the carrier, the shipment is in the carrier's control.

Address Accuracy, Signature Requirements, and Lost or Stolen Packages

You are responsible for providing a complete, accurate, and deliverable shipping address. We are not responsible for packages delivered to an incorrect or incomplete address you provided, and packages returned to us as undeliverable may be subject to additional charges for reshipment.

Orders over $500 require a signature upon delivery. If we offer optional third-party shipping protection at checkout, purchasing it entitles you to file a claim directly with that provider for packages lost, stolen, or damaged in transit, typically resulting in a free replacement. If you decline shipping protection where it's offered, or if your order doesn't include it, we're not able to offer a refund or replacement once the carrier's tracking confirms delivery — but we're glad to assist you in filing a claim with the carrier.

Returns and Refunds

9.1 All Sales Are Final

Because our products are sold exclusively for laboratory research and development use, and because we cannot verify storage, handling, or chain-of-custody conditions once a product has left our facility, we do not accept returns or exchanges for correctly filled orders, and all sales are final. This protects the integrity of every lot we ship and the researchers who rely on it. The limited exceptions below, and any rights you may have under applicable law, still apply.

9.2 Missing, Incorrect, or Defective Items

If your order arrives missing an item, contains an incorrect item, or includes a defective product, contact us at the email in Section 13 within 7 days of delivery with your order number, the affected lot/batch number, and photos of the item and packaging. Once we verify the issue, we'll make it right with a replacement or a refund, at our discretion.

9.3 Lost, Stolen, or Damaged-in-Transit Packages

These are handled as described in Section 8. Where optional shipping protection was purchased, file a claim directly with that provider. Where it wasn't, we're unable to offer a refund or replacement once delivery is confirmed by the carrier, but can help you file a carrier claim.

9.4 What This Section Does Not Cover

This section covers our responsibility for fulfillment errors or product condition at the time of shipment. It does not create a right to return a product because a research protocol changed, because a product was opened or used, or because delivery simply took longer than expected — see Section 5.

How Refunds Are Issued

Where a refund is approved under Section 9, it will be issued to your original payment method. Please allow 5–10 business days for the refund to appear on your statement, depending on your bank or card issuer. Original shipping charges are non-refundable except where the return is due to our error.

Receipt, Storage, and Handling

Every shipment includes the batch/lot number and Certificate of Analysis for the product(s) you ordered. Upon receipt, you're responsible for inspecting, storing, and handling the product properly and in accordance with the storage guidance on its Certificate of Analysis, applicable safety data, and your institution's laboratory protocols. As a general matter, lyophilized peptides should be stored at −20°C for long-term storage and 2–8°C for short-term storage; reconstituted material should be kept refrigerated, protected from light, and used promptly. This information is provided for laboratory handling purposes only and is not guidance for human or animal use, dosing, or administration.

Why We Don't Offer Standard Returns

Peptide integrity depends on unbroken cold-chain handling and documented chain of custody from the moment a lot leaves our facility. Once a product has shipped, we have no way to confirm it was stored, transported, or handled correctly — so accepting it back and reselling it would risk shipping degraded or compromised material to the next researcher. The all-sales-final model in Section 9, paired with real accountability for our own fulfillment errors, is how we balance fairness to you with the integrity of every lot we ship.

Contact Us

For any question about an order — shipping, tracking, cancellations, or a claim under Section 9 — contact:

Changes to This Policy

We may update this Shipping & Returns Policy from time to time to reflect changes in our practices, carriers, or legal requirements. We will post the updated Policy here with a revised “Last Updated” date. Your continued use of our website after changes are posted constitutes acceptance of the revised Policy.