Studies in the past thirty years have shown that the formulas are far more effective with less side effects than single herbs or Western formulas that have not been tested in their final form. (allpetcareanimalhospital.com)
The wider safety margin seen with veterinarian - approved flea products means that they tend to cause less side effects and adverse reactions compared to the over-the-counter «bargain» products. (parkanimalhospital.com)