When puppies are born and begin to drink milk from their mother, natural pheromones are released. Whilst these cannot be detected by humans, these pheromones actually have a calming effect on puppies and they make sure that the puppies feel at ease when their mother is nearby. Research has shown that dogs are also susceptible to these pheromones at a later age, and can also be reassured in a similar way. Adaptil products, except tablets, contain a copy of these pheromones.