A method for providing a K2-enriched FU-LING extract is provided. The method comprises the following steps:(a) mixing a FU-LING with a solvent to provide a first mixture；(b) alkalizing the first mixture to provide a second mixture；(c) acidifying the second mixture to provide a third mixture,(d) alkalizing the third mixture to provide a forth mixture, wherein the forth mixture has a pH value of more than 7； and(e) neutralizing the forth mixture,wherein the K2 is at least one of tumulosic acid, dehydrotumulosic acid, polyporenic acid C and 3-epi-dehydrotumulosic acid.
