Does K-ION NANO GLASSES release negative ions have an expiration date?

K-ION NANO GLASSES release negative ions, and theoretically, as long as the lenses are not damaged or worn, there is no specific expiration date for their negative ion releasing properties. This means that with normal use and proper maintenance, you can continue to use these glasses indefinitely. As long as the lenses remain intact, you can enjoy the benefits of negative ions without worrying about when they might expire.

It's important to note that keeping the glasses clean and storing them properly is also key to ensuring their performance. Regular cleaning and careful storage will help extend the lifespan of the lenses and protect the negative ion release properties.