Interesting. I fast around 20 hrs a day and use NMN which have also been shown to work in mice against Covid but Fisetin may be worth a try. Especially if you can get the required amount from strawberries. I’m not sure I want to go through the hassle of experimenting with more supplements.
I’ve already read that once you go past something like the 14 hour mark of fasting, the garbage collectors go to work.
Strawberries are the greatest natural source, but they go nowhere close to what a supplement can provide. You’d need multiple pounds a day.
Blueberries are a source of Pterostilbene, but you’d need to eat a fair amount of those.
I will say blueberries were the only fruit/veggie that was proven to grow neurons in the brain, and specifically, those needed for balance control.