Some have reported regaining smell with the use of BASIL essential oil – applied topically, diffused, and in food.
This is from one of the oils groups in which I participate . . .
I had a client who had a stroke which left her taste buds damaged… I encouraged her to put a drop of peppermint on her tongue each morning. I did not hear from her for several months… and when I did, she said she was enjoying food again and 80% of her taste had come back! I have not seen her for over a year… no news is good news.. she must be better now.