to treat diarrhea, hemorrhage, and skin disease.

Showing promise in treating colorectal, pancreatic, lung, prostate, cervical, and skin cancer in vitro and in animal models, 

https://www.herbalgram.org/resources/herbclip/issues/issue-671/quercus-infectoria-galls-medicinal-benefits/

Interesting that this substance had been used from the time of Moses for making special ink!

What’s clear in our tradition is that Moshe was told by G-d at Sinai that these holy items must be written with an ink called de’yo. It’s also clear that this de’yo must be black and must have staying power. 

https://ohr.edu/this_week/mezuzah_maven/7583

From the Dead Sea scrolls and ancient tefillin analyzed using a cyclotron at UC Davis we can see that originally scribal ink was carbon-based. Soot was gathered from burning vegetable fats, mostly olive oil. Charcoal dust was produced by burning vegetable matter such as beech trees or cedars. Often, a glass plate was suspended over the burning materials, and the gathered soot was scraped off for use.

Durability was achieved by adding oak gall-nut powder, a substance rich in tannic acid, to “bite” into the parchment. The galls are formed when a gall wasp lays eggs on the leaves of oak trees