Catechu: What It Is and How People Use It
Catechu is a dark, tannin-rich extract made from the heartwood of certain Acacia trees. People have used it for centuries in traditional medicine, in mouthcare, and as a food additive. You might recognize it as an ingredient in paan (betel nut wraps) or in some herbal mouth rinses. It has strong astringent properties — that’s the drying, tightening feeling — and that explains most of its uses.
In practical terms, catechu is used to reduce mild inflammation, soothe minor mouth sores, and help control diarrhea. It also shows antimicrobial effects in lab studies, which supports its traditional use for oral hygiene. In folk medicine you’ll find it as a powder, tincture, or mixed into lozenges and topical pastes.
What catechu does
The active compounds are tannins and flavonoids. Tannins bind to proteins on the surface of tissues, which can reduce secretions and shrink swollen tissue — useful for mouth ulcers, sore gums, and loose stools. Flavonoids add mild antioxidant and antimicrobial action. In short, catechu helps to tighten tissues, reduce mild bleeding, and may lower bacterial growth in the mouth.
Lab research supports antimicrobial effects against common oral bacteria and some gut pathogens, but human studies are limited. That means catechu can be helpful as a complementary option for minor problems, not a replacement for prescribed treatments. For example, it can ease sore gums but won’t cure a serious infection that needs antibiotics.
Safe use and buying tips
Start small. If you try catechu orally, use a low-dose product or dilute a pinch of powder in water to rinse your mouth. For diarrhea, traditional preparations are more concentrated — follow product directions or ask a pharmacist. Don’t use it long-term without medical advice because tannins can interfere with nutrient absorption, especially iron.
Side effects are usually mild: temporary mouth dryness, staining of teeth, or mild stomach upset. Avoid catechu if you’re pregnant or breastfeeding unless a healthcare professional approves it. Also be cautious if you take iron supplements, certain antibiotics, or medications that rely on steady nutrient levels.
Buy from trusted herbal suppliers or pharmacies. Look for clear labeling of origin, extraction method, and concentration. If you want it for mouth care, choose products formulated for oral use rather than bulk powders. If you have an ongoing health issue, ask your doctor before adding catechu to your routine.
Want a quick test? Mix a small amount with water and rinse your mouth for 30 seconds. If irritation or strong staining happens, stop and rinse with plain water. Used carefully, catechu can be a handy, traditional tool for mild oral and digestive complaints.
Keep catechu away from children and pets. Store in a cool, dry place and check expiry dates on commercial products. If you plan to combine it with other herbs or supplements, list everything for your healthcare provider to review. If you notice worsening symptoms, fever, or ongoing bleeding after using catechu, stop and seek medical advice promptly. Keep records of effects you notice.
