Seraglio et al. (2019) reviewed the published research on honeydew honey physicochemical characteristics and bioactivity ([1]). Honeydew honeys — including oak — present darker color, lower monosaccharides, higher pH, higher acidity, higher electrical conductivity (often 0.8–1.5 mS/cm vs blossom honey's <0.5), higher protein and mineral content, higher phenolic compound content, and higher oligosaccharide content. Oak honeydew typically sits in the upper half of the honeydew range on mineral content (potassium and magnesium prominent) and phenolic content.
Pita-Calvo and Vázquez (2018) cataloged the analytical methods used to authenticate honeydew honeys by botanical and geographical origin ([2]). Two oak-specific marker compounds anchor the variety chemically: quercitol and trans-oak lactone for general oak honey. Two additional markers — 2-aminoacetophenone and propylanisol — specifically distinguish holm oak (Quercus ilex) honey. These markers are the load-bearing chemistry for authenticating oak honeydew at the laboratory level, especially given the variety's premium pricing and the corresponding fraud risk.
The framing matters. Both references treat their findings as composition + in-vitro characterization. Neither demonstrates human-health outcomes. Oak honeydew is meaningfully different from floral honey on multiple measurable axes (mineral content, electrical conductivity, oligosaccharide content, phenolic content, distinctive marker chemistry) — that is what this page claims. Anything beyond that — immune support, respiratory benefit, "detox," lower-glycemic, "therapeutic," "medicinal" — is unsupported and stripped from this page on principle.