As does Johns Hopkins: https://www.hopkinsmedicine.org/coronavirus/pact/index.html
Something to consider: maybe it's your usage of long covid that's incorrect?
If you investigate you'd probably be surprised just how behind the 8-ball these institutions are. Their inability to predict the bleedingly obvious as corona viruses have a history of triggering ME/CFS. Their many decades of gaslighting patients and recommending harmful treatments such as exercise and cognitive behavioural therapy.
Those of us from the ME/CFS space knew this was coming and knew people with Long Covid were going to be gaslit so we've been educating them on what to expect and how best to treat it. Plus we don't mind that they're rebranding ME/CFS as Long Covid as we'd like these institutions to actually do their job and do some research. We're not expecting an apology for the decades of gaslighting. The main thing we want is for people to not waste time rediscovering what we already know. Conflating the Long Covid (ME/CFS) part of PASC with the organ damage part muddies the water and diminishes focus.
Hope your smell returns sooner rather than later. My mom has been without hers for 9 months now, which seems to be in the rather unlucky category.
If you had to just try 2 of them, I'd try EGCg and Magnesium Threonate -- but it might help you recover your senses. The only thing off for me now is eggs, I'm super sensitive to the sulfur in them.
I don't see anyone claiming loss of smell is long COVID, it's two entirely different things, loss of smell is symptom of COVID and you can have it longer or shorter. "Long COVID" is now catchphrase to cover pretty much anything for hypochondriacs. Sure minority of people claiming they have long term issues after COVID can have something which we could call "long COVID", but most of people claiming they have long COVID are hypochondriacs. Ocassional headache? Long COVID. Tiredness? Long COVID. Etc. I've had "long COVID" years ago before COVID.
Honestly I'm not surprised US nation addicted to drugs especially antidepressants is major nation experiecing long COVID, while this long COVID pretty much doesn't exist poorer the country you go and it's exclusive to few western countries.