1.Gallic acid has antibacterial effect and can treat bacillary dysentery. It has astringent, hemostasis and antidiarrheic effects;
2.In food industry, it can be used to prepare preservative propyl gallate;
3.It can be used in the production of mordant dyes and as a developer, etc.;
4.It forms blue-black precipitate with ferric ion, which is the raw material of blue-black ink;
5.It can be combined with vitamin C as a fortified bait to raise fish;
6.It is also used in tanning industry and can also be used as a photographic developer.
It is widely used in various fields like pharmaceutical and food industries, ink and tanning industries ect.