It won't hurt anything, but as Jim said, it'sdebatable if it actually helps anything. Studies haveindicated that the probiotics, not being native to that particularintestinal tract are killed off and do not actually inoculate the gutwith any healthy agents.
We have found probiotics such as Acid Pac to be helpful during times ofstress such as traveling and showing, but it could just be theelectrolytes that actually help and not the probiotics. Theproduct is also sweet and encourages the rabbit to drink, which is aplus during hot weather and traveling.
I really would say that the product is not necessary as long as the rabbit is healthy and on a balanced diet.
Pam