Category: polyphenol
Aliases: 4,4',5,5',6,6'-Hexahydroxydiphenic acid 2,6,2',6'-dilactone
Dimeric gallic-acid aglycone released from ellagitannin hydrolysis in the stomach / upper GI. Poorly absorbed intact (<1%); most activity attributed to gut-microbe-derived urolithins (A, B, C). Anti-oxidant + anti-inflammatory effects reported in vitro; direct clinical data modest.