Hello, the possibility of allergies due to the calming effect of matatabi is actually completely different issues. Normally, we can see that matatabi, although rare, has effects such as sneezing on cats that are allergic to dust, different smells, etc. So if there is a tendency towards allergies, it can be allergic to any other scent normally, or it can also be matatabi. Matatabi makes cats happy because of a natural scent that cats love. That's where the calming effect comes from. Apart from this, we see calming, sleeping and resting as in cats that play quickly and actively for a long time. � �