Mastagi Rumi (Mastic Gum): Stomach Evidence, Jawline Trend, Fakes
Mastagi, or mastagi rumi, is mastic gum: the pale, tear-shaped resin of the mastic tree (Pistacia lentiscus), a scrubby relative of the pistachio that is harvested commercially on one Greek island, Chios. Hakeems have prized it for the stomach for centuries, the internet now chews it for a sharper jawline, and most of what sells as “mastagi” in a pansari’s tray is not from Chios at all.
Quick facts
- English: mastic gum, Chios mastic (mastiha); Arabic and Persian mastaki
- Scientific name: Pistacia lentiscus, the Chios form grown as var. chia; family Anacardiaceae (pistachio, cashew, mango)
- Form: hard, pale yellow to white resin “tears”; sold whole, ground, as oil, and inside Unani compounds such as Jawarish Mastagi
- Best-supported use: easing indigestion symptoms; one good trial, not a settled fact
- Price signal: true Chios resin is expensive and PDO-protected; cheap “mastagi” is usually another Pistacia resin
- Safety flag: hard to chew, cross-allergy with pistachio and cashew, never for children under 5
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Mastagi in English, and why Unani calls it “Rumi”
Mastic is the dried sap of the mastic tree. The tree grows wild around the Mediterranean, but only on the southern half of Chios does it weep resin in quantity and quality worth harvesting. Growers cut the bark in summer, the sap drips and hardens on the cleared ground beneath, and the “tears” are collected, washed and sorted by hand. Chios mastic has carried European Protected Designation of Origin status since 1997, which means the name legally belongs to resin from that island.
“Rumi” is the old word for the lands of Rum, the Byzantine Greek world. When Arab and Persian physicians wrote mastaki rumi, they meant exactly this: the Greek mastic, as opposed to local resins that looked similar. The name survived into Urdu as mastagi rumi, and it still marks the real thing from the substitutes.
Gum, “mastagi ki lakri” and Jawarish Mastagi: three different things
At a pansari you may meet three products under one name. Gond mastagi is the resin itself, the subject of this page. Mastagi ki lakri is sold as wood or bark of the mastic tree; it is a different part of the plant, carries little of the resin, and should be priced far below the gum, so ask which you are being given when a bag is simply labelled “mastagi”. Jawarish Mastagi is a sugar-based Unani compound in which the resin is one ingredient among several. Our Jawarish Mastagi guide covers that product, its sugar load and its claims; the Unani preparations explainer covers what a jawarish is in the first place. Everything below is about the raw resin.
What mastagi does for the stomach: the evidence, honestly
Unani texts class mastagi as hot and dry, a strengthener of the stomach and liver that settles wind, stops nausea and firms loose gums. It was chewed after meals, powdered into jawarish, and smeared as a plaster over the belly. Greek and Roman physicians used it the same way two thousand years earlier.
Helicobacter pylori. In the laboratory, mastic kills this ulcer-causing bacterium; that result from 1998 is where the modern interest started. In people, the picture is weaker. A 2010 trial in 52 infected patients compared mastic alone with standard triple therapy (two antibiotics plus an acid blocker): mastic cleared the infection in roughly a third of patients, the antibiotics in more than three quarters. A separate 2003 trial saw no effect on infection status at all. In 2026 an Indian pilot trial added mastic to standard quadruple therapy: eradication was higher with mastic (85 per cent against 67), but the difference was small enough that it could have been chance, while stomach symptoms improved more in the mastic group. Fair reading: mastic has real activity against the bacterium, it is not a replacement for antibiotics, and nobody should swap a prescribed course for resin.
Indigestion without ulcers (functional dyspepsia). This is the best human evidence. In a 2010 double-blind trial, 148 people with functional dyspepsia took mastic or a placebo for three weeks; 77 per cent on mastic reported improvement against 40 per cent on placebo, with stomach pain, upper-belly ache and heartburn improving most. One trial is one trial, but it was properly run, and it matches the tradition well.
Teeth and gums. Small studies on mastic chewing gum and mastic toothpaste show less plaque and fewer odour-causing bacteria. Chewing almost anything sugar-free helps saliva; mastic adds mild antibacterial compounds. Plausible, modest, not a substitute for brushing.
Skin, cholesterol, “liver tonic”. Laboratory and small early studies only. Tradition claims more than the evidence supports.
Depends Worth trying for ordinary indigestion if you can afford real resin and have no nut allergy; pointless as an H. pylori fix on its own.
Mastic gum for jawline: the trend dentists wish would stop
Mastic is far harder than ordinary chewing gum, which is exactly why the “jawline” videos use it. Chewing hard gum for an hour a day will bulk the masseter muscles a little; it will not reshape bone or melt fat under the chin. A six-month Korean trial of regular gum chewing found no visible change in jawline. Dentists and orofacial pain specialists quoted in a June 2026 Science News report put it bluntly: there is no research behind the aesthetic claims, and over-chewing strains the jaw joint (the TMJ), bringing clicking, ear pain, headaches and night grinding. Hard resin also cracks fillings and pulls crowns.
If you chew mastic for your stomach, keep it to a small piece for a few minutes after meals, the way it was always used. If your jaw aches, clicks or locks, stop and see a dentist.
Real Chios mastic vs fake: grades, substitutes and the check that works
Adulteration is ancient; Dioscorides complained of mastic cut with pine resin and frankincense. Today the common substitute is resin of Pistacia atlantica, sold as “Iranian mastic”, along with old, stale Chios resin passed off as fresh. Chemists now separate them with NMR fingerprinting; you cannot do that at home, but you can catch the crude fakes.
- Warm it: hold one tear between finger and thumb for a minute. Real mastic turns slightly tacky and smells clean, resinous and faintly of pine with a sweet edge; no turpentine sharpness.
- Chew one small tear (adults only, no dental work at risk): for the first 30 seconds it is brittle and bitter, then it softens into a white, chewable gum. It never dissolves. A piece that crumbles to grit, melts away, or stays glassy and bitter is terebinth, another Pistacia resin, or a blend.
- Look at the tears: Chios tears are pale yellow to almost white, translucent, with a slightly dusty surface. Deep yellow or orange, very clear, or sticky tears point to other resins or heat damage.
- Look at the price and label: real Chios resin is one of the costliest food resins in the world and usually carries the island’s name and the PDO mark. A cheap bag of “mastagi” with no origin is almost certainly not from Chios.
The grade most people overpay for
Chios tears are sorted by size, not by purity. “Large tears” (over about 8 mm) and “small tears” (3 to 5 mm) are the same resin from the same trees, and the small ones cost less per gram. Larger pieces stay softer and are nicer to chew; small tears are the sensible buy for grinding into powder, for a jawarish, or for anyone who simply wants the resin. One more kitchen trick: put the tears in the freezer for ten minutes before grinding. Cold mastic snaps into powder, while room-temperature resin gums up the grinder and your spice mill will smell of pine for a week.
How mastagi is traditionally used, and the amounts question
Three traditional forms survive. A small tear is chewed after a heavy meal. Powdered resin goes into milk, honey, breads and puddings as a spice, a pinch (a quarter teaspoon or less) per dish, because more turns bitter. And the resin is cooked into compounds such as Jawarish Mastagi. For food, use the pinch. For anything taken as medicine, the pack or a qualified practitioner sets the amount; if symptoms have not eased within a few weeks, mastic is not the answer and the stomach needs a doctor, not a bigger spoon. Our bloating and gas guide covers the ordinary kitchen fixes for the same complaints.
Who should avoid mastagi
Nut allergy: the mastic tree is in the pistachio and cashew family (Anacardiaceae, which also includes mango and poison ivy). Anyone who reacts to pistachio or cashew should not chew or swallow mastic. Children under 5: no hard gum of any kind; it is a choking hazard, and a swallowed lump can lodge. Older children should not chew resin unsupervised. Teeth and jaw: cracked fillings, loose crowns and jaw-joint pain are the real everyday harms; stop if your jaw clicks or aches. Pregnancy and breastfeeding: a pinch in food is a normal spice; there is no safety data for medicinal amounts, so skip those. Stomach warning signs: black or bloody stools, vomiting blood, unexplained weight loss, trouble swallowing, or pain that wakes you at night are not for resin or jawarish; they need a doctor promptly. If you have been prescribed antibiotics for H. pylori, finish the course; mastic may be added, never substituted.
Swallowing a chewed piece now and then is harmless for adults; it passes through. Swallowing many hard tears whole is not, for the same reason as any hard lump.
The bottom line on mastagi
Known: it is the resin of Pistacia lentiscus, Chios makes the real thing, it kills H. pylori in a dish and eases indigestion in one solid trial. Claimed: ulcer healer, liver tonic, jawline sculptor. Uncertain: whether it adds anything meaningful to antibiotic treatment, and whether the dental benefits hold up in bigger studies. Main safety issue: it is a very hard resin from the pistachio family, so allergy, teeth and small children are the lines to watch. More honest ingredient pages like this one are in Unani & Herbal, Decoded.
Mastagi and mastic gum: your questions
Mastagi kya hai?
Mastagi is mastic gum, the hardened resin of the mastic tree (Pistacia lentiscus). The best grade comes from the Greek island of Chios, which is why Unani books call it mastagi rumi.
Mastagi in English?
Mastic gum, or Chios mastic. Greek sellers write it as mastiha; Arabic uses mastaki.
Mastagi ke fayde?
The best-supported benefit is easing indigestion: stomach pain, upper-belly ache and heartburn improved in a three-week trial. It has activity against H. pylori and plaque bacteria. Claims about the liver, skin and “strength” are tradition.
Mastic gum for H. pylori: does it work?
Partly. It kills the bacterium in the lab and clears the infection in some people, but far fewer than antibiotics do, and one trial saw no effect. Use it alongside prescribed treatment if you like; never instead of it.
Mastagi ki lakri in English?
It is sold as the wood or bark of the mastic tree, in English simply mastic wood or bark. It is not the resin and should cost much less. Ask the shop which one you are buying.
Gond mastagi ke fayde?
“Gond mastagi” is just the resin by another name, so the benefits are the same: mild help with indigestion and mouth bacteria. Nothing extra comes from the word gond.
Mastic gum jawline: is it safe?
Not as the videos use it. Hours of chewing hard resin strains the jaw joint and can crack fillings, and it does not reshape the face. A small piece for a few minutes after meals is the traditional, safer habit.
Is mastic gum safe to swallow?
An adult swallowing a chewed piece occasionally is fine; it passes through. Do not swallow hard tears whole in quantity, and never give hard gum to children under 5.
Dangers of mastic gum?
Allergic reactions in people sensitive to pistachio or cashew, choking in small children, dental damage and jaw pain from heavy chewing. Reports of serious internal harm are rare at food and traditional amounts.
Mastagi price in Pakistan?
We could not verify a current, dated price, so we will not guess. Real Chios resin costs many times more than local Pistacia resins; if a shop’s mastagi is cheap, it is almost certainly not from Chios.
How do I know my mastagi is real?
Warm a tear in your fingers and chew one: real mastic softens into a white, chewable gum within a minute and never dissolves, with a clean pine-sweet smell. Crumbly, melting or turpentine-sharp pieces are other resins. Only a lab test proves origin.
Sources
- Overview of Chios mastic gum (Pistacia lentiscus) effects on human health, Nutrients 2022
- Dabos KJ et al. Is Chios mastic gum effective in the treatment of functional dyspepsia? Randomised double-blind placebo-controlled trial, J Ethnopharmacol 2010
- Dabos KJ et al. The effect of mastic gum on Helicobacter pylori: a randomized pilot study, Phytomedicine 2010
- Tulsian V et al. Mastic gum as an adjunct to bismuth quadruple therapy for H. pylori eradication: randomized pilot study, Indian J Gastroenterol 2026
- Science News: No, mastic gum won’t reshape your jaw, June 2026
- An NMR-based metabolomics strategy for adulteration detection of natural resins: application to Chios mastic gum, J Pharm Biomed Anal 2025