All BIOptimizers products come with a 365-Day Money Back Guarantee. If you are not completely satisfied with your BIOptimizers product for any reason between today and 365 days from now, just send back your remaining unopened bottles of the product and we’ll give you a full refund (minus the cost of shipping and handling). If you open a second bottle, you no longer qualify for any guarantee. Reach out to our customer happiness team and they will take complete care of it.