Products may not be returned without proper authorization by the Biochain Technical Service Department. Due to the temperature sensitivity of our products, we are unable to restock and resell returned goods if the products have been used by customers already. All goods returned due to customer ordering error are subject to a 25% restocking fee. In order to receive credit, the products must be returned in their original, intact condition at your expense. BioChain reserves the right to change our return policy without notice. Please visit our website at www.biochain.com for details.