The greater the number of people who regularly use a product, the greater the number whose health is potentially at risk due to that product  More people regularly use household maintenance products such as cleaning agents and lawn chemicals than regularly use prescription medicines
The more people whose health might be at risk from the regular use of a particular product, the more important it is for that product to be carefully tested to ensure its safety.
 Ttherefore, it is even more important for such household products to be carefully tested to ensure their safety than it is for prescription medicines to be so tested