That is exactly what my professor said. I personally don't believe in CBD oil.it is our modern day snake oil.
Far too easy to have claims of benefits that are actually a result of the placebo effect.
We also have no idea yet if there is something in it that is toxic to birds. Again, birds are fickle creatures who can be killed or poisoned by the most innocent of substances. There is a reason the market is so open for avian veterinarians and medicine.