When you adopted a new adult cat, he might have his old habit of using the litter box. But changing the box or even changing the litter might cause him to disengage in the new one.
Another circumstance in that you might need help from attractants is when you adopted a stray cat or a kitten.
Many cat owners, especially those who adopted stray cats, praise this litter attractant. As stray cats often take the soft garden earth to be their defecating place, they might find it hard to adapt to the litter box.
Generally, kittens will learn a lot of things from their mom, especially how to urine and defecate. However, kittens who have to leave their mom when they are too young do not know how to use a litter box. Thus, you need to put a lot of effort into training them.
With litter attractant, your cats will be more engaged in using the litter box as the smell of the natural ingredients can attract them to it. And with a little more encouragement from you, they will know what to do when sitting inside the box.