Try Evivo for 21 days. If you're not satisfied, we'll give you a full refund, less the cost of shipping. Simply call 844.463.8486 M-F 7 am to 4 pm PT within 21 days, return any remaining sachets and we'll take care of the rest. Our guarantee is available on new 1-month Starter Kits or 1-month Refills, first order only. Limited to one per customer.