Pürblack will refund 100% of your purchase in the product did not work for you. We are fair to our customers and expect our customers being fair to us. In order to take advantage of our 90 day guarantee you will need to take Pürblack Live Resin on a daily basis as required and document taking it with date stamped photos, with meta-data intact and short journal entries describing change in how you feel from taking Pürblack Live Resin. If you did not experience any improvements, we'll refund your purchase.