Buckwheat honey contains markedly higher levels of phenolic compounds and antioxidant activity than pale floral honeys.
In a comparison of seven floral honeys, the darkest, buckwheat among them, measured highest on the ORAC antioxidant assay, which tracked phenolic content closely.
What this does not claim: Measuring higher antioxidant activity in a test tube is not the same as producing a health effect in a person. The quantity of honey anyone actually eats is small, and no clinical benefit follows from the assay result on its own.
- Antioxidant capacity of honeys from various floral sources based on the determination of oxygen radical absorbance capacity and inhibition of in vitro lipoprotein oxidation in human serum samples — Journal of Agricultural and Food Chemistry (2002) · Laboratory (in vitro) study Link