Three small trials form the whole case. The mastic gum evidence for upper gut comfort rests on studies of 20 to 80 people, most run before 2010, at 350 mg to 1 g daily for 2 to 4 weeks. Don't expect a strong effect.
mastic gum evidence: the trial list in full
One study used 350 mg three times a day. Another used 1 g once daily. A third ran for 2 weeks only. You'll notice the doses differ by a factor of 3 and the durations don't match either. That makes pooling them into one tidy number dishonest, so we won't.
Follow-up was short. Two weeks is not long enough to judge anything durable about a resin that people chew across a whole season, and nobody has run the longer trial that would settle it. Symptom scores moved in a favourable direction in most of these studies. The scales were different each time.
Why we stock it anyway
Tradition, not data. People on Chios have chewed this resin for centuries, and the safety record across that span looks reasonable, which counts for something even when it isn't a clinical claim. We say that out loud on the product page because you'll find plenty of sites that won't.
We also sell it because the alternative framing would be worse. Plenty of brands describe mastic gum with the confidence of a well-funded trial programme. Your expectations should match the file you just read. If you want a gut ingredient with heavy published support, this isn't it, and we'd rather you looked elsewhere.
How to weigh a 350 mg trial against your own expectations
Read the dose, then the duration, then the sample size, in that order. A 350 mg trial that ran for 2 weeks with 30 participants tells you very little about a 6 month plan. It's a signal, not a settled answer.
Check whether the study used a standardised resin or generic powder. Chios mastic is a protected product with a defined origin, and the chemistry varies with harvest conditions, so a study on one batch doesn't automatically transfer to a capsule bought elsewhere. Ask whether the brand names its raw material source. Most don't.
Check the endpoint last. Symptom questionnaires, breath tests and endoscopy findings are three different measurements, and a page that merges them into one claim has done something the researchers didn't.
Where the limit sits
Read labels slowly, because the wording is where honesty either shows up or doesn't. A carefully written page describes what a substance does in normal function. A stretched one implies an outcome. The difference is usually one verb.
For the sake of scale, 1 g daily for 4 weeks is 28 g of resin (28,000 mg). A typical 500 mg capsule count of 120 covers 60 days at that top dose. Capsules are slower than chewing the resin, and a 90 count bottle at 350 mg twice daily lasts 6 weeks. That arithmetic is the part you can actually verify before buying.
The honest summary we'd give a friend
You'll get a modest signal at best. Safety looks fine at these doses for most adults. It's a judgement call, and we've made ours in public, which is more than the category usually offers.
One caution. A trial on an ingredient is not a trial on the bottle. Capsule excipients, fillers and the exact resin grade all differ between brands, and none of the published work tested our finished product. We're not going to pretend otherwise to close a sale.
If you're taking anything else, or a clinician has already named your gut symptoms, that conversation belongs with them. Mastic gum doesn't slot into every routine, and knowing that in advance saves you $20.
Frequently asked questions
How good is the evidence?Show answerHide answer
Small trials, some decades old, with promising but limited findings.
Then why include it?Show answerHide answer
Because the traditional use is longstanding and the safety profile is reasonable.
Is this honest of you?Show answerHide answer
We would rather tell you the limits than let you assume stronger support than exists.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
