For sales on the Amazon.com, Quicksilver Scientific works hard to ensure that only authentic, high-quality products reach consumers in the condition we intend. Because unauthorized sellers are not subject to Quicksilver Scientific’s quality control standards, we cannot know how the seller may have handled any of our products prior to selling them. Because of this, our 45-day Satisfaction Guarantee does not extend to products purchased from unauthorized sellers. For more information about the 45-Day Satisfaction Guarantee, please click here. Presently, our only authorized sellers on Amazon.com are “Pattern Products” and “FortressBrand Wellness.” Please be sure to confirm that you are purchasing from an authorized seller to ensure you receive an authentic, high-quality product.