Tatal jati (Tectona grandis)

Condensed tannins are the dominant compounds in teak bark, giving it an astringent, puckering taste and helping constrict mucous membranes and stop bleeding. In addition, tectoquinone and lapachol—two naphthoquinone compounds characteristic of teak—possess strong antifungal and antibacterial activity, explaining the wood’s natural resistance to termites and decay. Teak bark also contains betulinic acid, a triterpenoid with anti-inflammatory, antiviral properties and potential anticancer effects that continue to be researched. Flavonoid pigments such as pelargonidin give young teak bark a reddish color when boiled or rubbed, while also serving as cell-protective antioxidants.

Teak bark is known as a remedy for stomach ulcers and acid reflux because its decoction can reduce excess gastric acid while coating irritated or ulcerated stomach linings, thanks to its high tannin content. Its strong astringent properties also make it effective for stopping bleeding in open wounds and speeding the drying of scabs. In cases of non-specific diarrhea, teak bark decoction helps firm up stools and slow excessive intestinal movement. In skincare, teak bark water is used for bathing or face washing because it can help treat acne, relieve itching caused by fungal infections, and reduce excess oil production.