Cat lysine ointment typically contains lysine, an important amino acid that helps the immune system suppress the replication of certain viruses, such as feline herpesvirus, thereby alleviating symptoms. In addition, other ingredients in cat lysine ointment, such as vitamins and minerals, can help improve a cat's skin and coat health, promote bone development, and maintain the function of the heart and nervous system.

For healthy adult cats, if they are already on a balanced diet, there is usually no need for additional catamine supplementation. However, for cats in certain situations, such as kittens, pregnant or lactating mothers, senior cats, cats with illnesses, or cats that are malnourished, catamine supplementation may help supplement their nutritional needs.