All our supplies are guaranteed for one year. Request for refunds occurring more than 30 days after the date of purchase on non-defective goods may be granted as a store credit if the goods are returned in their original condition. Yeast is perishable and should be refrigerated on arrival (best used in 60 to 90 days). No refunds are allowed on sales of living organisms such as yeast and bacteria. Email email@example.com if a return is necessary, or simply visit our warehouse during business hours. All returns will be performed by refund to the credit card on file from your last purchase.