The most common parasites you can find on your cats are fleas. These parasites can make their way into your home through an open window, a crack in the door, your pets, or you, without even knowing it. Fleas can really be irritating and annoying for your cat. They cause itching, hair loss, general discomfort, which can lead to worms and even diseases. Cheristin is a fast-acting flea protection, effective for up to 6 weeks that starts killing fleas in just 30 minutes. Cheristinis is formulated specifically for cats. Cheristin is an easy to apply, small tube, with a rounded-tip that won’t scratch your cat’s skin.