Yes I tried nicotine patches and it helped me to ged rid of fatigue and exercise intolerance, which I had both for 1 year.

It was that study of Dr. Marco Leitzke (on you tube).

I did as he recommended, 2 days 3,5mg /24h patches, followed by 7 days 7mg/24h patches and 2 days of 3,5/24h patches.

I tolerated it well. Of course there was a strange feeling in my brain, like something is busy working. And I sweat. But it was just in the beginning.
I had my ups and downs (fatigue) during the patches, but all in all it was better with the patches. I had more energy.

The 3 first days after I stopped using the nicotine patches, I was like before or even worse.
Then, day by day it startet to get better. On day 22 (counted from the beginning when I startet with nicotine patches), I felt as I had no more fatigue, exercise intolerance, brain fog and difficulties to find words.

But I‘m still not that fit as I used to be. I am on day 26 today.
I have still often cold feeds, prone to catch colds, have to eat all 4 hours 400kcl.

But I have my energy back and can go out for 1 hour walks! I couldn’t do that for 1 year! Sometimes I couldn’t go out at all, just lying on the couch for weeks.

I can feel, it is getting better from week to week.

I am a 41 year old nurse, slim, no smoking and was sportive before I got LongCOVID.