I don't  think there is any such additive but I'm totally sure about
that. My little Ragamuffin is a regular fur factory this time of year.
I brush his once a day and give him a little hair ball remedy to help
him pass the fur he licks off himself. Better that than have him barf
hairballs every couple of days.
Some people with long hair cats give them a trim in the early summer
so thats am option too.
Ed