Favorite item from home apothecary?

For all of you who've curated your own sort of "home apothecaries" and collections of herbs, oils, teas, etc., what is your go-to favorite thing? What item do you reach for more than anything else and what do you use it for? Is it a specific tea blend for anxiety? Is it an essential oil you diffuse for headaches? Or is it something like a tincture with a specific medicinal purpose?

We all work in such unique ways and I'd love to hear about your most effective, favorite thing. :)