An improved method for making a P. vulgaris bean extract that results in an extract having high α-amylase inhibitory activity and low hemagglutinin activity. The method involves treating the beans to selectively denature the hemagglutinin. A P. vulgaris bean extract is provided, having high α-amylase inhibitory activity and low hemagglutinin activity. A treatment for diabetes or method for reducing blood glucose level is disclosed using the P. vulgaris bean extract disclosed herein.
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