What is this Thai tea, spiral plant-part? I bought these, for me, nicely spiral looking dried fruits(?) in a tea-specialized shop in Bangkok in the area of the bridge leading from Phra Khanong towards On Nut (pictured below a cooked product).

I made a gentle tasting tea from these before bed time ; it was very nice for me.

What is this Thai tea, spiral plant-part?

Please share some information you find crucial about it in the answer.
These are fruits of the East Indian screw tree (Helicteres isora). The plants are native to Asia and Australia and its fruits are used in folk medicine.