Source: https://www.amazon.com/Capstar-Flea-Treatment-Blue-tablets/product-reviews/B005Z6UL1M/?_encoding=UTF8&camp=1789&creative=390957&linkCode=ur2&showViewpoints=1&sortBy=byRankDescending&tag=fleascience-20&linkId=NK2N4J7JTABQJWNL