What Is Mastic Chewing Gum and What Is It Made Of? | Resin, Not Ordinary Gum

Mastic chewing gum is made from mastiha, a resin tapped from the bark of the mastic tree grown in southern Chios, Greece.

The first chew tastes piney and slightly bitter, then turns soft and pale as it warms—the giveaway that mastic gum begins as hardened tree resin, not a synthetic base. Knowing what’s in it decides whether you’re holding the real Chios article or a candy with a drop of resin for marketing.

Where Mastic Resin Comes From

Chios mastic is the air-dried resin of Pistacia lentiscus var. chia, an evergreen shrub-like tree cultivated in the southern Chios villages known as the Mastichochoria. The same species grown elsewhere doesn’t produce resin with the same profile.

Growers level and smooth the soil beneath each tree into a “table,” dusting it with calcium carbonate so falling resin stays clean. From mid-July through late August they score the bark repeatedly with a pointed tool, and the tree bleeds a sticky liquid that hardens into translucent tears over roughly 15 to 20 days. The first gathering happens after August 15, per the growers’ association. Workers then rinse, dry, sort, and package the resin by grain size.

The Chios Mastiha Growers Association began developing chewing gum in 1955, opened its own factory in 1957, and made the first ELMA gum that same year—the name stands for ELLiniki MAstiha, Greek mastiha. The European Commission lists both Chios Mastiha Oil and ELMA chewing gum as Protected Designation of Origin products, a legal geographic guarantee.

What Mastic Gum Is Made Of

Raw Chios mastic is a natural, air-dried resin with no additives, per its published technical specification. Its makeup breaks down into measurable fractions:

Those are typical batch ranges, not label values; harvest conditions shift them.

Finished gum is usually not pure resin. Commercial mastic chewing gum can blend the resin with sweeteners, gum base, flavorings, coating agents, or processing aids, and the exact recipe belongs to each manufacturer. The association describes ELMA production as a controlled run of stirred raw materials, molding, drying, and final coating, but no universal formula exists. Read the full ingredient panel rather than assuming a stick is 100% resin.

What Mastic Gum Is Used For, And What The Evidence Shows

Mastic has flavored food and served Greek medicine for more than 2,500 years, per the European Commission, and now sells as resin, powder, oil, gum, and dietary supplements. Human studies have examined possible gastrointestinal and oral-health uses, and a 2022 review describes exactly that scope.

The limits matter: the same review notes long-term safety hasn’t been studied enough and a maximum safe dose remains unknown. Clinical research does not establish mastic chewing gum as a replacement for dental treatment or prescribed medication—chew it because you like it, not as therapy.

For a shortlist of what’s actually on the market, this roundup of tested mastic chewing gum picks saves label-reading.

The Chios mastic technical specification is the source for the composition ranges above and confirms the resin carries no additives.

Common Mistakes And Safety Notes

Two mix-ups cause most confusion: treating “mastic” as a synonym for any chewing gum, and treating every resin product as Chios-grown. Mastic names a specific botanical resin; Chios mastiha refers only to the variety cultivated in southern Chios.

• Don’t stretch the percentages. The technical specification gives typical ranges, never a guaranteed label value.
• Check the whole panel. Sweeteners, flavorings, coatings, and allergens change from brand to brand.
• Watch for allergy signals. Mastic sits in the Anacardiaceae family, alongside cashew and pistachio, and published literature reports allergic contact dermatitis from some topical mastic products. Serious reactions from eating it are rarely reported.
• Don’t carry over supplement doses. With long-term safety and a safe maximum dose both unsettled, a supplement serving shouldn’t be assumed safe just because gum is.

Anyone with a known tree-nut or Anacardiaceae allergy should start with a small piece, and anyone managing a medical condition should ask a clinician before adding mastic supplements.