There are two schools of thought about the efficacy of colloidal silver in the treatment of a variety of feline diseases but essentially focusing on viral and bacterial infections.
What is interesting is this. Every webpage that recommends the use of colloidal silver as a health treatment for cats (including FIV) contains information from people which is anecdotal. It is from people who have used colloidal silver either on themselves or a pet and sometimes a cat, or the information comes from a supplier of the product. Amongst suppliers, the product's wondrous properties tend to be overhyped as an alternative to "expensive" veterinary care.
On the other side of the coin there is one organisation which is against the use of colloidal silver. The organisation is the US Food and Drug Administration (FDA). It took me a little while to find this information and the relevant webpage whereas by contrast there are many pages of information from users or sellers which, in general, recommended the product.
The FDA state on their webpage from 11th February 1997 (which is now an archived page and may of course be out of date) that they have received reports that products containing colloidal silver were being promoted for use in the treatment of various conditions affecting companion animals. The product was also found on dairy farms.
The FDA state unequivocally that:
FDA is not aware of any substantial scientific evidence that supports the safe and effective use of colloidal silver ingredients or salts for any animal disease condition.
As for the use of colloidal silver in food producing animals the FDA states that this constitutes a potentially serious public health concern. With respect to companion animals they say that the use of colloidal silver to treat serious illness could potentially endanger the health of the animal in delaying prompt veterinary treatment.
In short, this product is not approved by the FDA for use in any animal species. At the time they were continuing to investigate the promotion and use of this product in animals.
As can be seen, the official assessment of colloidal silver is a complete rejection which is in stark contrast to either rather vague information from users or heavily promoted information from suppliers and manufacturers.
It has crossed my mind trying it myself to treat Charlie's chronic sinusitis because my veterinarian, regrettably, has not got a handle on the problem, which puts the onus on me to do something about it but of course I will not take any steps that are in anyway risky.
I think most people would agree with me if I said that colloidal silver should not be used unless there is some overriding reason based upon science or hard evidence which recommends it to the cat owner.
Do you have any personal supporting evidence?