Mastic Gum
Best-in-class: Mastic Gum
Tree resin from the Greek island of Chios with a small but real evidence base in upper-GI symptoms.
Mastic Gum quick facts
| Suggested dose | 350 mg–1 g daily, typically before meals, for 2–4 weeks. |
| How often | daily |
| Who it's for | Upper-GI discomfort, reflux-type symptoms, gastritis. |
One of the few gut botanicals treating a cause rather than coating a symptom, and the H. pylori evidence is real though eradication rates are well below triple therapy. Also improves functional dyspepsia scores. Genuine mastic from Chios is expensive and widely adulterated. Worth trying where standard treatment failed or is not tolerated, rather than instead of it.
How Mastic Gum actually works
Chios mastic resin has direct bactericidal activity against Helicobacter pylori, demonstrated in vitro and supported by human trials showing eradication in a proportion of patients. It also appears to have independent anti-inflammatory and mucosal-protective effects in the stomach.
Where to get Mastic Gum
Find Mastic Gum on iHerb →What it is, why it recurs, and where this fits — free to read.
The H. pylori Protocol →What it is, why it recurs, and where this fits — free to read.
The evidence for Mastic Gum
Graded by what exists behind each claim.
✅ Clinically validated
- Small RCTs show symptom improvement in functional dyspepsia versus placebo.
- Some trials show activity against H. pylori, though eradication rates as monotherapy are poor — it is not a replacement for a proper regimen.
📊 Correlative data
- Harvested on Chios for over two thousand years and used across the eastern Mediterranean for stomach complaints — a traditional application that later turned out to have a plausible target in *H. pylori*.
🧪 Theoretical / extrapolated benefits
- Proposed mucosal protection and antibacterial activity in the stomach specifically.
How to read these tiers: they say how much human evidence exists, not how well something works — and ✗ flags harm, never a disappointing trial. How the evidence tiers work →
What Mastic Gum actually does
Mastic is not a gum. It is a terpene resin, tapped from cuts in the bark of Pistacia lentiscus var. Chia on the southern half of one Greek island, and its useful chemistry is triterpene acids — masticadienonic acid, isomasticadienolic acid, oleanonic acid — sitting in a matrix of neutral triterpenes, a percent or two of volatile oil, and a large insoluble polymer of myrcene Paraschos 2012. Calling it a gum invites you to think of a fiber. It is closer to a solvent extract that arrived pre-dried.
The named target is Helicobacter pylori, and the named molecule is a single triterpene acid. When the resin was fractionated and tested against clinical isolates, isomasticadienolic acid killed the organism with a minimum bactericidal concentration of 0.202 mg/mL Paraschos 2007. That is the most specific number anyone has ever produced about this product, and it is the number a capsule has to reach in gastric mucus for the mechanism to be more than a story.
The polymer is dead weight, and removing it is what made the chemistry work. Poly-beta-myrcene is insoluble; it does not dissolve in gastric juice and it carries no measured activity. The preparation that produced every animal result is total mastic extract WITHOUT polymer — the fraction left after the inert part is taken out Paraschos 2007. A capsule of ground whole resin includes it, which means part of every gram you swallow is there because the tree made it, not because anyone showed it does something.
The result nobody quotes, and it is the interesting one. Three months of that extract in H. pylori SS1-infected mice cut colonization roughly 30-fold — 1.5 log CFU per gram of tissue — and produced no attenuation of the chronic inflammatory infiltrate and no change in the activity of the gastritis Paraschos 2007. Fewer bacteria, identical inflammation. That dissociation is fatal to the assumption a reader brings: that killing some of the organism is the same as calming the stomach.
The dyspepsia claim runs on a different mechanism that has never been isolated. Mastic is recognized in Europe as a herbal medicine for mild dyspeptic complaints Soulaidopoulos 2022, and the proposed action there is mucosal — a coating and accommodation effect on a stomach that is not necessarily infected with anything. Nobody has separated that from the antibacterial claim in the same trial, so the product is sold on two mechanisms and tested on one.
Cell, rodent, human — and where it stops
The dish. Chios mastic extracts and their isolated constituents were tested against H. pylori clinical strains, and the best single constituent had an MBC of 0.202 mg/mL Paraschos 2007. Hold that against a fasted stomach of roughly 250 mL: reaching it would need about 50 mg of that one acid in solution, in the right compartment, at the same time.
The mouse. Same paper, in vivo arm: SS1-infected mice, polymer-free extract at an average 0.75 mg per day by mouth for three months, giving the 1.5 log reduction and the unchanged histology Paraschos 2007. And a second mouse study did the step that usually gets skipped — it measured where the triterpene acids actually go after oral mastic, by LC-MS/MS Lemonakis 2011, which matters because a compound that is absorbed has left the stomach.
The humans, in the order they happened. A 1998 letter in the New England Journal of Medicine reported that mastic gum kills H. pylori Huwez 1998, and that single page is where this product entered the supplement world. Five years later, nine infected patients took mastic 1 g four times daily — 4 g/day — for 14 days: all eight who completed stayed positive, with urea breath test delta scores of 19.1 ± 3.7 before and 18.7 ± 3.8 after, P = 0.8 Bebb 2003. Nothing moved at all.
The randomized trial, with its arms. Fifty-two infected patients, four arms of 13. Mastic 350 mg three times daily (1.05 g/day) eradicated 4 of 13. Mastic 1.05 g three times daily (3.15 g/day) eradicated 5 of 13. Pantoprazole plus mastic eradicated 0 of 13. Standard triple therapy eradicated 10 of 13 Dabos 2010.
The obstacle is the dose, and this site's own card is on the wrong side of it. The arms that eradicated anything used 1.05 and 3.15 grams a day; the card advises 350 mg to 1 g daily. The lower trial arm is the card's ceiling, and the better arm is three times it. A reader following the label is running the arm nobody tested, below the arm that cleared 4 in 13.
The second obstacle is the preparation. Every animal number belongs to polymer-free extract Paraschos 2007; every human number belongs to raw resin Dabos 2010 Bebb 2003. Those are not the same material, and the direction of the difference — the humans got the diluted version — is the direction that flatters the resin.
Mastic Gum — which form, and does it matter
Chios, or it is a different resin. The evidence belongs to Pistacia lentiscus var. Chia, a protected-origin material from one island Paraschos 2007. Other Pistacia species yield resins with different triterpene profiles and no trials. “Mastic” on an ingredient line is a trade word, not a botanical one.
Nothing on the shelf is standardized to the molecule that works. The assay the evidence is written in is triterpene acid content — isomasticadienolic and masticadienonic acids Paraschos 2007. No supplement label states a percentage of either. You are buying resin by weight and assuming the tree was consistent.
Whole tears against polymer-free extract. The insoluble myrcene polymer is a substantial fraction of raw mastic and it is the part the researchers deliberately removed before the mouse work Paraschos 2007. Nobody sells the removed version. This is the one supplement on this shelf where the better product exists, has been tested, and has never been made.
Chewing and swallowing are two different exposures. Chewed resin releases the volatile fraction into the mouth and delivers the rest slowly over an hour; a swallowed capsule delivers a bolus of solid resin into gastric acid. The trials swallowed it, in grams Dabos 2010 Bebb 2003, and the chewing-for-jawline use that made this product famous online has nothing to do with either.
What would have to be true, and how you would know it was not
1. The urea breath test is the whole argument, and it is cheap. If this works for the reason it is sold, a repeat urea breath test five weeks after a 14-day course at 3.15 g/day should turn negative. Predict that in about 5 cases in 13, because that is what the trial found Dabos 2010. Retest at five weeks and not sooner: any earlier and you are reading suppression as clearance.
2. The prediction that cuts against the product, and against this site's card. At the label dose of 350 mg to 1 g a day, predict the breath test delta does not move at all. Four grams a day for two weeks moved it from 19.1 to 18.7 at P = 0.8 Bebb 2003 — four times the card's ceiling, and the number did not budge.
3. Comfort without clearance should be the usual outcome, and it should not be read as success. Predict upper-abdominal symptoms improve while the organism is still there. The mouse data say exactly this is possible: 1.5 log fewer bacteria and identical gastritis Paraschos 2007.
4. If eradication is real, ferritin is the delayed second signal. Chronic H. pylori gastritis is a recognized cause of iron deficiency, so predict ferritin and the iron panel drift upward over 3–6 months in someone who was both infected and iron-deplete — and predict nothing at all in someone whose ferritin was normal, because a marker with no deficit cannot correct. Predict hs-crp and cbc stay where they are; a resin acting on one organism in one organ has no published route to a systemic inflammatory change.
What nobody has tested yet
Nobody has given a human the extract the mice got. The 30-fold colonization drop belongs to polymer-free extract Paraschos 2007; all 61 humans who have taken this in a published trial took raw resin Dabos 2010 Bebb 2003. A three-arm study — raw resin, polymer-free extract, placebo — is an obvious experiment and it has never been run.
Nobody has measured what reaches gastric mucus. Triterpene acids have been quantified after oral dosing in mice Lemonakis 2011, but the number that decides this product is local: micrograms per milliliter of gastric mucus, against an MBC of 0.202 mg/mL Paraschos 2007, held for how many minutes. One gastroscopy series would answer it.
Nobody has explained why acid suppression made it worse. Pantoprazole plus mastic eradicated 0 of 13 while mastic alone eradicated 4 of 13 Dabos 2010. Raising gastric pH changes the ionization of a carboxylic-acid triterpene and therefore where it partitions between mucus, lumen and mucosa. That is a testable physical-chemistry prediction and nobody has tested it — which is striking, because a proton-pump inhibitor is exactly what most people buying this are already taking.
And nobody has run the dyspepsia trial at the eradication dose. The European recognition is for mild dyspeptic complaints Soulaidopoulos 2022; the doses with any measured antibacterial effect are grams Dabos 2010. Whether the symptom benefit needs the antibacterial dose, or happens at a fifth of it, is unresolved and decides what a bottle should say.
Mastic Gum — its own safety story, not its category's
The real hazard is a comfortable stomach with a live infection. Monotherapy cleared 4 of 13 and 5 of 13 Dabos 2010, and one trial cleared nobody at all Bebb 2003. Untreated H. pylori is a peptic ulcer and gastric cancer exposure that runs for decades, and the specific way this product hurts people is by making the symptom that would have sent them for a breath test go away.
The allergy is botanical, not vague. Pistacia lentiscus sits in the Anacardiaceae, alongside pistachio, cashew and mango. That is the family to check, and it is a more useful sentence than “may cause an allergic reaction”.
The tolerability record is 21 people at gram doses for two weeks. Eight completed 4 g/day for 14 days Bebb 2003 and 13 took 3.15 g/day for the same period Dabos 2010. That is the entire human safety file at doses with any evidence behind them. It covers a fortnight, and people take this for months.
It is absorbed, so “it only acts in the stomach” is not a safety argument. Triterpene acids are measurable systemically after oral mastic Lemonakis 2011. Anything with systemic exposure and no long-term human data is an open question rather than a reassurance, and mild antiplatelet activity has been attributed to this resin without ever being quantified in a person on an anticoagulant.
Sources read for this page
- Dabos KJ. The effect of mastic gum on Helicobacter pylori: a randomized pilot study.. Phytomedicine 2010 · PMID 19879118
- Paraschos S. In vitro and in vivo activities of Chios mastic gum extracts and constituents against Helicobacter pylori.. Antimicrob Agents Chemother 2007 · PMID 17116667
- Bebb JR. Mastic gum has no effect on Helicobacter pylori load in vivo.. J Antimicrob Chemother 2003 · PMID 12888582
- Huwez FU. Mastic gum kills Helicobacter pylori.. N Engl J Med 1998 · PMID 9874617
- Lemonakis N. Oral administration of chios mastic gum or extracts in mice: quantification of triterpenic acids by liquid chromatography-tandem mass spectrometry.. Planta Med 2011 · PMID 21870323
- Paraschos S. Chios gum mastic: A review of its biological activities.. Curr Med Chem 2012 · PMID 22414110
- Soulaidopoulos S. Overview of Chios Mastic Gum (Pistacia lentiscus) Effects on Human Health. Nutrients 2022 · PMID 35276949
How you would know if it worked
There is no blood test for this one. That is not a criticism — it is a fact about the effect, and it changes how you should judge it.
- What to watch: Upper-abdominal pain and post-meal fullness across a two-to-four-week course at the studied dose. That is the functional dyspepsia picture the small placebo-controlled trials used, and it is the only symptom set this resin has been measured against.
- How long before it means anything: Two to four weeks, which is the length those trials ran. Beyond that with no change, the course has already answered you.
- What will fool you: Symptom relief can mask an untreated Helicobacter pylori infection, and that is the dangerous false positive here — eradication rates for mastic as monotherapy are poor, so comfort is not evidence the organism has gone. Functional dyspepsia also remits and relapses on its own over exactly this timescale.
Run it one variable at a time. Starting three things in one week means a result you cannot attribute, which is the same as no result.
Mastic Gum — safety & side effects
- GI upset, and headache in some people.
- Allergy in people sensitive to pistachio or mango (same plant family).
- May have mild antiplatelet activity. Not established as safe in pregnancy or breastfeeding — not because harm is documented, but because these are the two populations systematically excluded from the trials. Absence of data is not reassurance. Generally well tolerated.
Not medical advice. If you take prescription medication or have a diagnosed condition, check this against it with a pharmacist or doctor — pharmacists are underused and free.
- When to take it, and what to take it with
- Which form actually absorbs
- Who it's worth it for
- Best-in-class brand pick
- Coach Cam's stacks and notes
- Fasted or with food, and when in the day
- Morning or night, and why that window
- Around training, or deliberately away from it
- What it must not share a window with
Everything above is free and stays free. Skool is where it becomes a plan — Mastic Gum in an order, with the rest of what you're running.
Unlock in Skool — $10/mo →Bloodwork to run alongside Mastic Gum
Baseline first, then again at 8–12 weeks.
| Marker | What it’s watching for |
|---|---|
| Complete Blood Count (CBC) with Differential | Anemia is the commonest sign of a gut absorbing badly |
| Ferritin | Iron is the first thing malabsorption takes |
| Vitamin B12 | The second thing, and the one with permanent consequences |
| hs-CRP (High-Sensitivity C-Reactive Protein) | Separates inflammatory bowel disease from IBS |
The Gut Health & Absorption panel covers these in one order — 11 markers, $208.80 with the discount applied.
Check results you already have → · All 103 markers A–Z
Mastic Gum — frequently asked questions
What is Mastic Gum?
Tree resin from the Greek island of Chios with a small but real evidence base in upper-GI symptoms.
What is the suggested dose of Mastic Gum?
350 mg–1 g daily, typically before meals, for 2–4 weeks. This is a general reference for education only — statements have not been evaluated by the FDA and this is not medical advice.
Where can I find Mastic Gum dosing and the full breakdown?
The suggested dose and the full evidence — clinical, correlative and theoretical — are on this page. What's inside Skool is when to take it, which form actually absorbs, the brand worth buying and Coach Cam's stacks.
Where can I buy Mastic Gum?
Coach Cam sources Mastic Gum from vetted, top-rated brands on iHerb — use the buy link on this page.
What Mastic Gum is used for
Mastic Gum appears under 2 goals in the goal router.
Related Gut & Digestion supplements
Where this goes next
The pages here are the frameworks. The protocols — the dosing, the order to correct things in, the week-by-week schedule and what to retest — are inside Skool.