Vitamin C is the bodys primary water-soluble antioxidant which makes it an important weapon in the immune systems arsenal against bacteria and viruses. The Holisticat website suggests giving your kitty 250 to 500 mg of l-lysine to your kitty daily during the time she is ill. Pin On Dear Santa As a nutritional supplement for cats then vitamin C is probably a bad … [Read more...] about Vitamin C For Cats With A Cold