My friend had COVID in September 2020 and never got her taste back. What low-risk random things should she try doing to get it back? Recommendations need not be backed by anything stronger than “a friend of a friend heard…” or “I saw it on TikTok” - I’m looking for a broad library of things for her to consider trying. She is sane and is not the type to drink bleach or whatever, so don’t worry about recommending questionable things.
If LSD works, I would guess that it works because low-level sensory processing normally has its learning rate set to ~0 in adults, but LSD increases the learning rate, allowing it to rewire and adapt itself, and in particular adjust its connections to ignore dead neurons or whatever. That's kinda uninformed speculation after reading this