There should be some important information on the container about vitamin A and D content, how much to use, etc.
Can you check and let us know what you find?
This is just a word of caution from Provet:
http://www.provet.co.uk/petfacts/health ... veroil.htm
http://www.provet.co.uk/petfacts/health ... eeding.htm
As a good, long-term safety precaution, it would be best to use a fatty acid supplement that does not
contain vitamin A and D.
Also, consider upgrading the diet because fat is not the only nutrient that's involved in skin and coat problems.
One more thing. Blood vitamin A and D levels can be measured, it can easily be determined whether your cat is getting enough of these vitamins. If not, your veterinarian can prescribe a safe amount. I urge you to have a blood test done before you start supplementing with vitamin A and D on your own.
Also, anyone who adds vitamin D to an already balanced and supplemented commercial diet needs to know that vitamin D is the most toxic of the vitamins. Excess intake leads to very serious problems.
(Excess intake of vitamin A also leads to very serious problems.)