Oh, Oh... Colloidal Silver by itself is not likely to reach an infection that deep. Your friend should mix 90% Colloidal Silver with 10% DMSO (99.99% Pure) available at Amazon.Com.
The DMSO will carry Colloidal Silver deep inside the nasal tissues.
Also, nebulizing colloidal silver is a great way to get it directly into your blood supply to bypass the stomach, which will also target cells directly.