Mastic is marketed first for stomach bacteria, yet its strongest human result is in plain indigestion with no cause found. In 148 patients, 77% improved on it.
On placebo, 40% did, and that gap is the story here.
Quick Answer: Does Mastic Gum Help Indigestion?
For functional dyspepsia, probably. A 2010 double-blind trial gave 148 patients 350 mg of mastic 3 times a day or placebo for 3 weeks: 77% improved markedly on mastic, 40% on placebo. A 2025 crossover trial at 1.4 g a day reported less bloating and heartburn. Indigestion beyond 2 weeks needs a doctor.
Key Takeaways
- Functional dyspepsia means indigestion with 0 structural cause found on tests.
- A 2010 trial randomized 148 patients to mastic or a placebo.
- Marked improvement came in 77% on mastic and 40% on placebo.
- A 2025 crossover trial at 1.4 g a day found similar gains.
- No trial has tested mastic for GERD, only heartburn within 1 condition.
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What Functional Dyspepsia Is
It is indigestion that keeps coming back when the tests find nothing wrong. It is common, and conventional treatment helps only some people.
- Typical symptoms: Upper abdominal pain, burning and early fullness.
- Diagnosis: Rome criteria, after ulcers and other causes are excluded.
- Not the same as: An ulcer or an H. pylori infection.
- Why it matters here: This is where mastic performed best.
What the resin is and where it comes from is set out in our overview of the resin.
The 2010 Trial
This is the largest mastic trial in any stomach condition, and it was placebo-controlled.
| Detail | What the trial did |
|---|---|
| Patients | 148 meeting Rome II criteria |
| Dose | 350 mg 3 times a day, 1.05 g in total |
| Length | 3 weeks |
| Marked improvement | 77% on mastic, 40% on placebo |
| Symptoms that improved | Stomach pain, dull upper ache, heartburn |
The symptom score after treatment was significantly lower on mastic than on placebo.[1]Is Chios mastic gum effective in the treatment of functional dyspepsia? A prospective randomised double-blind placebo controlled trial — Journal of Ethnopharmacology (2010) View source Stomach pain when anxious also improved, which fits a condition with a strong gut and brain component.
The 2025 Replication
A second trial used the newer Rome IV criteria and a crossover design, so each person tried every option. It used 1.4 g a day, and how the trial doses compare with a capsule is worked through separately.
- Phase A: Mastic capsules, 1.4 g a day for 4 weeks.
- Phase B: Mastiha water, 20 ml a day.
- Phase C: No intervention, as the comparison.
- Washout: 14 days between phases.
Both mastic forms improved symptoms against the no-intervention period, and the capsules reduced bloating, epigastric burning and heartburn.[2]A randomized, three-way crossover clinical trial on the efficacy of Mastiha based therapies (Pistacia lentiscus var. Chia) in functional dyspepsia — Pharmacological Research (2025) View source The comparison was no treatment rather than placebo, which makes it weaker evidence.
Why It May Work Here and Not on H. pylori
Eradicating a bacterium is a yes or no outcome. Easing symptoms is not, and that is a lower bar. In the 2026 add-on trial, symptom scores moved more clearly than eradication did.[3]Mastic gum as an adjunct therapy to standard bismuth quadruple therapy for Helicobacter pylori eradication: A randomized single-blind pilot study — Indian Journal of Gastroenterology (2026) View source
- H. pylori: Mastic alone cleared 4 or 5 of 13 patients.
- Dyspepsia: 77% reported marked improvement.
- Mechanism: Not established in people for either.
- Takeaway: Symptom relief is the claim the data can carry.
The contrast is clearest in what happened when it was tested on H. pylori, where antibiotics cleared 10 of 13.[4]The effect of mastic gum on Helicobacter pylori: a randomized pilot study — Phytomedicine (2010) View source
Heartburn, Reflux and GERD
People searching for mastic and GERD deserve a straight answer. There is no GERD trial.
- What was measured: Heartburn as 1 symptom of dyspepsia.
- Where: In both the 2010 and the 2025 trials.
- What was not: Reflux disease, oesophagitis or acid levels.
- Chewing gum: No trial tested mastic gum for reflux.
The European Medicines Agency accepts mastic for mild dyspeptic disorders, and advises seeing a doctor if symptoms last beyond 2 weeks.[5]European Union herbal monograph on Pistacia lentiscus L., resina (mastic) — European Medicines Agency View source
Using It for Indigestion
These terms follow the trials rather than the marketing.
- Amount: About 1 to 1.4 g a day in the trials.
- Trial length: 3 to 4 weeks before judging it.
- EMA limit: See a doctor if symptoms last beyond 2 weeks.
- Red flags: Weight loss, vomiting or trouble swallowing.
New indigestion after the age of 60, or any alarm symptom, needs investigation before any herb.
Where the Capsule Fits
The trials used swallowed mastic, so a capsule is the closest match to what was tested.
- 2010 trial: 1.05 g a day in 3 doses.
- 2025 trial: 1.4 g a day in capsules.
- Our label: 1 capsule, 1 g, once a day.
- EMA range: 1 to 2 g a day.
Taken for indigestion, a single 1000 mg capsule of mastic sits close to the 2010 trial amount.
See a Clinician Before Treating Indigestion Yourself If
- You have tested positive for H. pylori, which needs prescribed treatment and 1 retest
- You have black stools, vomiting, weight loss or difficulty swallowing
- You react to pistachio, cashew, Mastisol skin adhesive or other tree resins
- You are pregnant or breastfeeding, where the EMA does not recommend mastic
- Your indigestion lasts longer than 2 weeks, the EMA limit for self-care
Frequently Asked Questions
How long does it take for mastic gum to start working? +
The dyspepsia trials judged it after 3 to 4 weeks. The EMA advises seeing a doctor if symptoms persist beyond 2 weeks.
Can mastic gum cure GERD? +
No trial has tested it in GERD. Heartburn improved as 1 symptom of functional dyspepsia in 2 trials, which is a different condition.
Which gum is best for GERD? +
No mastic trial measured reflux. Any chewing gum raises saliva, but mastic has 0 GERD trials behind a specific claim.
When is the best time to take mastic gum? +
The 2010 trial split 1.05 g into 3 doses across the day. No trial compared timing, so this is convention.
What is functional dyspepsia? +
Recurring indigestion with no structural cause found on tests. It is diagnosed with the Rome criteria, now in their 4th version.
How much mastic was used in the dyspepsia trials? +
350 mg 3 times a day in 2010 and 1.4 g a day in 2025. Both sit within the EMA range of 1 to 2 g.
Does mastic gum help bloating? +
In the 2025 crossover trial the capsules reduced upper abdominal bloating. That was 1 trial without a placebo arm.
Is mastic better than peppermint for indigestion? +
No trial compared the 2 directly. Each has its own trials, so a head-to-head claim has no evidence behind it.
When should indigestion be checked by a doctor? +
When it lasts beyond 2 weeks, starts after about age 60, or comes with weight loss, vomiting or trouble swallowing.
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