Skin Supplement for Extended Flea Protection for Kittens and Cats. CapShield Plus is a combination of Nitinpyram and Lufenuron. Lufenuron is a growth inhibitor (IGR) that will stay in the blood stream about 30 days. Any new fleas that get on the cat after the first day and take a blood feed will not fully reproduce. Capshield Plus is the only way to introduce a long-term IGR into the animal’s environment as the sun breaks down IGR in yard sprays within a day!
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