Omphacinon shows higher antioxidant content and stability than mature olive oil for potential topical applicationsUnripe Olive Oil Shows Potential for Oral and Skin Care

Omphacinon, the oil from unripe olives (Olea europaea L.), occupied a privileged position in Mediterranean materia medica from the Hellenistic period to the late Middle Ages. Sources in Greek, Latin, Aramaic, Hebrew, and Arabic record its use in oral hygiene, dermatological care, antiperspirant preparations, and as a base for medicinal ointments and perfumes; Dioscorides identifies it as the oil best suited to medicinal use. Despite cost and lower yield, ancient practitioners preferred unripe fruit. A preference persisting across more than a millennium and across different medical traditions raises a testable question: do the chemical features of unripe olive oil correspond to the medicinal-preventive advantages attributed to it in the historical record? We work across three bodies of evidence: primary sources (Theophrastus, Dioscorides, Pliny, Columella, the Geoponika, Paulus Aegineta, the Mishnah and Babylonian Talmud, Maimonides, Ibn al-Baytar), archaeological reports from production sites (Pompeii, Herculaneum, Delos, Paestum), and the modern analytical literature on unripe olive oil composition. Botanical names were verified against the Medicinal Plant Names Services (MPNS) and World Flora Online (March 2026); reporting follows the Four Pillars of Best Practice in Ethnopharmacology and the Consensus Statement on Phytochemical Characterisation (ConPhyMP) framework. Modern analyses point to a consistent picture: oil from unripe fruit carries higher levels of polyphenols, tocopherols, and squalene, with lower volatile content and greater oxidative stability than oil from ripe fruit. This profile makes chemical sense of several uses recorded in the historical sources. Antimicrobial activity is relevant to oral hygiene; squalene-mediated emollient effects are relevant to dermatological care; the antioxidant profile favors the oil as a stable carrier for medicated and aromatic preparations. The strength of the evidence varies. Oxidative stability and carrier oil functionality have firm chemical support. Oral health uses are mechanistically plausible and consistent with clinical data on olive oil. Dermatological uses rest on indirect evidence. Antiperspirant claims remain speculative, and the rabbinic claim of depilation is not adequately explained by current chemistry. Omphacinon is best treated as a candidate for evidence-based validation through controlled comparison with mature olive oil. It provides no grounds for therapeutic recommendation.