Adams d-Limonene Flea & Tick Shampoo kills fleas and ticks and contains cleansing agents lanolin and special conditioners. It is highly regarded not only as an effective flea and tick but also as a superior grooming product. formula contains the key active ingredients, D-limonene, a pleasant citrus scented insecticide, plus cleansing agents, lanolin, and special conditioners. As a result, tangles brush out easily, leaving with a clean, soft, shiny healthier looking coat and a fresh, clean smell.