A food material with blood circulation improvement action derived from purple potato

摘要

PROBLEM TO BE SOLVED: To obtain a blood circulation improver containing as active ingredient an aqueous solvent extract derived from purple sweet potatoes, and to obtain a food (material) containing an effective amount of the active ingredient. SOLUTION: The blood circulation improver and food (material) are obtained based on having found that purple sweet potatoes have the rat life-lengthening effect for rats under hypoxic conditions, cerebral blood flow (oxygen supply quantity)-increasing effect and blood vessel-relaxing effect as well as antioxidative ability having been known so far.