Return Policy

Your money-back guarantee and return window depend on the product you purchase. All periods begin on delivery:

• DIFINEY 4.0, 1-device pack: 90 days after delivery.
• DIFINEY 4.0, 2-device bundle: 90 days after delivery.
• DIFINEY 4.0, 3-device bundle: 90 days after delivery.
• Ultrasonic Cleaner purchased separately: 30 days after delivery.
• DIFINEY 2.0: 90 days after delivery.
• Reusable Nasal Strips: 30 days after delivery, with free return shipping.

The updated DIFINEY 4.0 and Reusable Nasal Strips policies apply to orders placed on or after November 2, 2026, at 9:54 p.m. Pacific Standard Time (PST, UTC-08:00). The order placement time determines which policy applies; the return window begins on delivery. Earlier orders retain the guarantee offered at purchase, including any previously promised 120-day DIFINEY 4.0 or 90-day Reusable Nasal Strips window.

Products may be worn or used during the applicable guarantee period and remain eligible for return. Please return all included components and the original packaging, and retain your receipt or proof of purchase.

To start a return, you can contact us at service@idifiney.com.

If your return is accepted, we'll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.

We do not charge return, exchange, or restocking fees. For Reusable Nasal Strips, return shipping is free and we provide a prepaid return label. For other products, customers are responsible for return shipping costs.

You can always contact us for any return question at service@idifiney.com.

Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.

Certain types of items cannot be returned, like perishable goods (such as food, flowers, or plants), custom products (such as special orders or personalized items), and personal care goods (such as beauty products). We also do not accept returns for hazardous materials, flammable liquids, or gases. Please get in touch if you have questions or concerns about your specific item.

Reusable Nasal Strips remain eligible for the 30-day free-return offer even after you have tried the product.

Sale-priced items remain eligible under the return window for the product purchased. Gift cards are non-returnable.

The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.

We will notify you once we've received and inspected your return, and let you know if the refund was approved or not. If approved, you'll be automatically refunded on your original payment method within 10 business days. Please remember it can take some time for your bank or credit card company to process and post the refund too.

If more than 15 business days have passed since we've approved your return, please contact us at service@idifiney.com.