Samples are designed to last only 1-2 days, and are provided not only to see how you like them, but mainly to see if there are any adverse reactions.  We are NOT looking to see whether or not they work - quality products take time to do their magic.  Many people see a difference right away, but results vary from person to person. Regularly keeping in touch by email is encouraged and is an integral part of the Eval by Email® Adult Acne Clearing Program.