NOW Pets L-Lysine Powder helps support a healthy immune system, normal respiratory health, and also helps to maintain ocular health. Give to your cat during or after mealtime. For cats 6 months or older 1/8 teaspoon twice daily and kittens under 6 months give 1/16 teaspoon twice daily. NOW Pets L-Lysine Powder is recommended by renowned veterinarian Dr. Barbara Royal, DVM, CVA, founder of the Royal Treatment Veterinary Center. NOW Pets has been certified by the National Animal Supplement Council (NASC), an organization that protects and enhances the integrity of the animal health product industry by promoting the well-being of non-human food chain animals that are given animal health supplements by their owners. NOW Pets premium pet supplements are formulated and manufactured with the same attention to quality and detail NOW puts into their supplements intended for humans, from the sourcing of top-quality ingredients to finished product testing.