| abstract |
To provide a compound which can be ingested continuously and has an action of improving vascular endothelial function by enhancing the action of NO from vascular endothelial cells. A compound represented by the formula (I) (wherein R 1 , R 2 , R 3 and R 4 are each H or a gallate group) or a salt thereof, and vascular endothelial function improvement containing the compound Agent, food or drink, or pharmaceutical composition. |