Not all mastic gum is genuine Chios resin. Here's how to tell authentic Pistacia lentiscus from filler blends, and our ranked picks by dose, purity testing, and value.
Mastic gum supplements vary enormously in sourcing, dose, and verification — and because genuine Chios-grown *Pistacia lentiscus* resin commands a real price premium, cheaper products sometimes cut corners on sourcing or dose accuracy. Here's what to look for and our ranked picks for 2026.
Authentic Chios sourcing. True therapeutic-grade mastic gum comes from *Pistacia lentiscus var. Chia* grown in the "mastic villages" of southern Chios — a designation protected under EU law. Products that clearly state Chios or Greek sourcing are more likely to reflect the resin used in the published clinical trials (Dabos 2010, Triantafyllou 2011, Kaliora 2007) than generic "mastic gum" of unspecified origin.
Dose matching the trial-tested range. Most human trials used doses between 1,000 mg and 2,200 mg/day. Products offering meaningfully less per serving (500 mg or below) require taking more capsules to reach a trial-relevant dose — not necessarily a dealbreaker, but worth factoring into cost-per-effective-dose comparisons.
Third-party or standardized testing. Because mastic resin is a natural product with variable active compound content (mastic and masticonic acid levels differ by harvest and processing), a standardized extract or a batch-tested product offers more consistency than untested raw powder.
Capsule-only, minimal fillers. Vegetarian/vegan capsules with short ingredient lists (resin plus a plant-based capsule shell) most closely resemble what was used in the clinical literature, which generally tested the resin itself rather than proprietary blends.