Products purchased directly from BIOptimizers or an authorized retailer are provided with a 100% satisfaction guarantee. Unfortunately, we cannot guarantee products that have been handled by distributors outside of our carefully selected network of partners. You may contact our help desk at (800)719-2467 Mon - Fri 10am to 8pm EST or [email protected] within 365 days of the original order date for 100% refund of the product purchase price (excluding any shipping and handling charges) and obtain an RMA (Return Mailing Authorization) number and shipping instructions to return any unopened product. RMAs (Return Mailing Authorization) are only available to customers returning items within the 48 contiguous United States, Alaska, and Hawaii.