Refund & Returns.

Because research materials may require controlled handling and because returned products cannot always be verified for integrity, we generally do not accept change-of-mind returns of opened or used materials. This does not affect rights that cannot lawfully be excluded.

Please inspect deliveries promptly and notify us within 72 hours of delivery when practicable if an item is broken, defective, missing or different from the order. Include the order number, product and lot identification and, when possible, photos of the condition and packaging. The 72-hour request does not shorten any non-waivable legal right.

After review, eligible claims may be resolved by replacement, correction, refund or another remedy required by applicable law. We do not charge for correcting an error attributable to us.

Before sending any product back, contact our support team to receive instructions. Unauthorized shipments may be rejected for handling or safety reasons. Do not send materials to the business correspondence address without return authorization.

Approved refunds are initiated through the original payment method where possible. Processing times can vary by the payment provider or financial institution. Taxes and shipping are refunded when required by law or when the approved resolution includes them.

Nothing in this policy removes applicable consumer rights, PayPal dispute rights or protections established by law. We encourage direct contact to resolve an issue, but customers are not required to waive payment-provider rights.

Orders we cannot fulfill are eligible for cancellation and refund according to applicable shipment and consumer-protection requirements.