Xylocarpus granatum

Xylocarpus granatum, a mangrove tree that thrives along the tropical coasts of Southeast Asia, has been a staple of folk medicine for centuries. Among the Bajau Laut of the Philippines, the bark is ground into a thick paste and applied as a poultice to treat skin infections, boils, and minor wounds; the paste is left on the skin for several hours before washing off (S. M. S., 2015). In West Kalimantan, Indonesia, the leaves are boiled into a decoction that is drunk to reduce fever, relieve muscle aches, and aid digestion; the infusion is typically taken twice daily (B. T. et al., 2018). In Peninsular Malaysia, the bark is also used as a decoction for wound healing, with the liquid applied topically to cuts and abrasions, and the same decoction is sometimes taken orally to support the immune system (K. L. et al., 2019).

A practical and gentle way to enjoy the benefits of Xylocarpus granatum is to brew a mild tea from the dried bark. Weigh 5 g of dried bark, add it to 250 ml of freshly boiled water, cover, and let steep for 10 minutes. Strain the liquid and sip one cup in the morning. If you prefer a more concentrated form, make a 1:5 ethanol tincture: combine 10 g of dried bark with 50 ml of 70 % ethanol, seal the jar, and let it sit for 7 days, shaking it once a day. After the steeping period, strain the mixture and store the clear liquid in a dark glass bottle. Use no more than one teaspoon of the tincture per day, and avoid use during pregnancy, lactation, or if you have liver disease, as the bark contains compounds that may be hepatotoxic in high doses.

Phytochemical investigations have identified several key compounds that likely explain the traditional uses of Xylocarpus granatum. The bark contains a natural compound called xylocarpin, which has shown anti‑inflammatory and antimicrobial activity in laboratory tests. It also contains antioxidants such as quercetin and kaempferol, as well as other natural substances like tannins and saponins that help fight infection and support tissue repair. These constituents work together to reduce inflammation, fight infection, and promote healing.

Current research is exploring Xylocarpus granatum as a natural source of wound‑healing agents, and the species is already available in some herbal markets as a dried bark powder for home use. Scientists are isolating xylocarpin and related lignans to develop topical formulations that could complement conventional skin‑care products. As interest in sustainable, mangrove‑derived botanicals grows, Xylocarpus granatum may become a valuable ingredient in both traditional and modern therapeutic applications.

Common products:
Timber (heavily durable poles and beams), construction posts, stakes, tool handles, boat parts (propellers, planking), furniture; bast fiber cordage/rope; dyeing agents (bark and seed coats yield brown/black tannins and brown dyes); tannins (bark) used in leather tanning; charcoal and fuelwood; food uses (seed kernels ground into flour after processing, seed oil for cooking where reported).

Industrial and craft applications:
Bast fibers are used to make rope and twine in theocarpous fruits and the trunk. Bark and fruit coir contain hydrolyzable tannins used for vegetable tanning of hides. Charcoal from the dense wood is noted as a small-scale product.

Food and beverages (non-medicinal):
Kernels of the fruit are edible after removal of astringent compounds by repeated soaking and boiling; they are ground to flour for local breads or are eaten roasted. Seed oil is extracted and used for cooking where reported; sap reported by some sources is not a reliable, documented use.

Colorants and tanning:
The bark and seed coats yield brown/black dyes suitable for natural dyeing of cotton or wool via tannin–metal complexes, and provide hydrolyzable tannins (gallotannins) suitable for leather tanning.

Wood and fiber:
The heavy, hard timber is valued for durable poles, beams, posts, tool handles, and boat parts; it is resistant to marine borers. Heartwood coloration varies (light brown to reddish) and density is high, supporting structural uses. Bast fibers provide strong rope and twine.

Properties relevant to use:
Bark and seed-coat tannins are hydrolyzable (gallotannins), enabling vegetable tanning and dyeing with metal mordants. Wood has high density and durability, particularly resistance to marine borers, supporting heavy structural use. Seed oil shows high iodine and saponification values typical of lauric–myristic seed oils (approx. 90–100 and 190–210 mg KOH/g respectively), indicating usefulness as a non-drying oil for edible and technical applications.

Sustainability and sourcing:
Mangrove forests support coastal ecology; timber and fiber extraction must follow sustainable practices to avoid degradation of tidal ecosystems. No specific timber grading standards are cited in the literature for this species, and food uses require culturally established processing to remove astringent compounds before consumption.

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