Darker honeys contain more phenolic compounds and measure higher in antioxidant assays.
Consistently reported across compositional studies: phenolic content and measured antioxidant capacity correlate strongly with colour, and buckwheat, honeydew and chestnut honeys sit well above pale floral honeys.
What this does not claim: This is a measurement of the substance in a laboratory assay, not a demonstrated benefit to anyone eating it. No clinical trial has shown a health outcome difference between dark and pale honey. The absolute quantities are small relative to ordinary dietary sources, and honey remains approximately 80% sugar whatever its colour.
- Composition of American Honeys and related analytical work — United States Department of Agriculture · Peer-reviewed article