Mastic gum comes from a tree resin and may help with digestion and oral health, but the evidence is still limited
Mastic gum is a resin that comes from the mastic tree, which grows mainly on the Greek island of Chios. For centuries, people in the Mediterranean have chewed it or dissolved it in water as a folk remedy. Modern research has looked at whether it reduces stomach inflammation, kills bacteria that cause ulcers, freshens breath, and strengthens gums—but the studies so far are small, and most have been done in test tubes or animals rather than in people.
The active compounds in mastic gum include volatile oils and polyphenols, which do show antimicrobial and anti-inflammatory effects in laboratory settings. Whether those effects translate to meaningful benefits when you consume mastic gum is a different question, and one that remains partly unanswered.
Key Takeaways
- Mastic gum contains compounds that kill bacteria and reduce inflammation in lab studies, but human trials are small and results are mixed.
- The strongest evidence exists for oral health—some human studies show it may reduce gum bleeding and plaque, though the effect is modest.
- For stomach ulcers and general digestion, most evidence comes from animal studies or test-tube work; human data is limited.
- Mastic gum is generally considered safe for most people, but it can interact with certain medications and may cause digestive upset in some.
How mastic gum may reduce stomach inflammation
The bacteria Helicobacter pylori causes most peptic ulcers. In test-tube and animal studies, mastic gum has shown activity against this bacterium, and some compounds in the resin appear to reduce inflammation in the stomach lining. A small human trial published in the journal Phytomedicine in 1998 found that participants who took mastic gum for two weeks showed improvement in ulcer symptoms, though the study included only 38 people and lacked a control group that received a placebo.
Later human studies have been inconsistent. A 2010 trial in Journal of Ethnopharmacology found no significant difference between mastic gum and placebo for reducing H. pylori infection, though participants did report less stomach pain. The gap between lab results and human outcomes suggests that mastic gum may soothe symptoms without actually eliminating the infection, or that the dose and duration matter in ways researchers have not yet pinned down.
If you have an active ulcer or H. pylori infection, mastic gum should not replace standard medical treatment. Antibiotics remain the evidence-based first step.
Mastic gum and oral health: the strongest evidence
Gum disease and tooth decay involve bacterial biofilms—sticky communities of microbes that form on teeth and gums. Mastic gum's antimicrobial compounds do disrupt these biofilms in the lab. Several small human studies have tested whether chewing mastic gum or using mastic-containing products reduces plaque, bleeding, and inflammation in the gums.
A 2009 study in Journal of Periodontology found that people who chewed mastic gum for 30 minutes daily for two weeks showed a modest reduction in plaque and gum bleeding compared to a control group. A 2015 review in Phytotherapy Research concluded that mastic gum may help reduce gum inflammation and bleeding, though the authors noted that most studies were small and that the effect size was modest—meaning the improvement was real but not dramatic.
The evidence is stronger for mastic gum as a supplement to brushing and flossing than as a replacement. If you use it, chewing for 20 to 30 minutes after meals or before bed is the most common approach in the research. Mastic-containing mouthwashes and toothpastes also exist, though fewer human trials have tested them.
What research shows about digestion and gut health
Beyond ulcers, mastic gum has been studied for general digestive complaints—bloating, gas, and irregular bowel movements. Most of this evidence comes from animal studies or test-tube work showing that mastic gum reduces inflammation and may promote the growth of beneficial gut bacteria. Human trials are sparse.
One small 2015 study in Digestive Diseases and Sciences found that people with irritable bowel syndrome who took mastic gum for eight weeks reported less abdominal pain and bloating than those on placebo. However, the study included only 60 participants, and the improvement was modest. No large, well-designed trials have confirmed whether mastic gum is truly effective for IBS or other functional digestive disorders.
If you have chronic digestive symptoms, mastic gum may be worth trying as part of a broader approach—alongside dietary changes, stress management, and medical supervision—but it should not be your only strategy.
Antimicrobial and anti-inflammatory compounds in mastic gum
The reason mastic gum shows promise in lab studies is its chemical makeup. The resin contains volatile oils (mainly alpha-pinene and beta-myrcene) and polyphenols (including masticic acid), which have antimicrobial and antioxidant properties when tested in isolation. These compounds can kill or inhibit the growth of several bacteria, including H. pylori, Streptococcus mutans (a cavity-causing bacterium), and Porphyromonas gingivalis (a gum disease pathogen).
In animal models, mastic gum has also reduced markers of inflammation in the stomach and intestines. However, the dose used in animal studies is often much higher than what a person would consume, and the resin's compounds may be broken down or absorbed differently in the human digestive system. This is why test-tube and animal results do not always predict human outcomes.
Potential side effects and interactions
Mastic gum is generally well tolerated. The most common side effects reported in studies are mild digestive complaints—nausea, constipation, or diarrhea—usually occurring at higher doses. Allergic reactions are rare but possible, especially in people sensitive to plants in the Anacardiaceae family (which includes cashews and pistachios).
Mastic gum may interact with blood-thinning medications such as warfarin, since some of its compounds have mild anticoagulant properties. If you take anticoagulants or antiplatelet drugs, discuss mastic gum with your doctor before using it. It may also affect blood sugar levels in people with diabetes, though evidence is limited.
Pregnant and breastfeeding people should avoid mastic gum, as safety data in these populations is lacking. If you have a tree nut allergy or a known sensitivity to resin products, err on the side of caution.
How to use mastic gum and what to expect
Mastic gum is sold in several forms: whole resin pieces for chewing, capsules, powders, and products like mouthwash or toothpaste. Dosages vary widely across studies and products. For chewing, the typical approach is 1 to 2 grams (roughly the size of a small marble) chewed for 20 to 30 minutes, once or twice daily. For capsules, doses range from 300 milligrams to 2 grams daily, usually divided into smaller amounts.
If you are trying mastic gum for oral health, consistency matters more than high dose. Using it daily for at least two weeks is the minimum in most studies before any effect appears. For digestive symptoms, trials have typically run eight weeks or longer, so patience is needed.
Mastic gum is not regulated by the FDA as a drug, so quality and purity vary by brand. Look for products that specify the origin (Chios mastic is considered highest quality) and have been tested by a third party for contaminants. Price is often a clue—authentic mastic gum is expensive, and very cheap products may be adulterated.
Frequently Asked Questions
Does mastic gum cure ulcers or H. pylori infection?
No. While mastic gum shows activity against H. pylori in the lab and may ease symptoms, it is not a proven cure. Standard antibiotic therapy remains the evidence-based treatment. Mastic gum might be used alongside medical treatment, but only under a doctor's supervision.
Can I use mastic gum instead of brushing and flossing?
No. Mastic gum may help reduce plaque and gum bleeding when added to a routine that includes brushing and flossing, but it cannot replace mechanical cleaning. Think of it as a supplement, not a substitute.
How long does it take to notice a difference?
For oral health, most studies show changes after two to four weeks of daily use. For digestive symptoms, trials have run eight weeks or longer. Individual results vary, and some people may not notice any change.
Is mastic gum safe to use long-term?
Short-term use (up to several months) appears safe for most people, based on available studies. Long-term safety data is limited. If you plan to use it regularly, discuss it with your doctor, especially if you take blood thinners or have diabetes.
What is the difference between mastic gum and other herbal remedies for digestion?
Mastic gum has been studied more than many herbal remedies, particularly for oral health and ulcer symptoms. However, the evidence is still modest compared to conventional treatments. Other remedies like ginger or peppermint have different active compounds and different research profiles, so the choice depends on your specific symptoms and what evidence exists for each.