Many plants have chemicals that we can take advantage of, and orchids being a very large plant family, I'm sure many are good for us although I only know one.
I read that dendrobium nobile has been used by the Chinese for certain medicinal purpose.
For what, I don't know.
Orchids growing is definitely good for mental and emotional health, although it may be a little hard on the physical health. too much work
Their flowers are great for eyes!
Many smell good which is good for uplifting our moods.