The present invention relates to a method for producing chlorella extract with improved functionalities characterized by extracting chlorella powder using supercritical carbon dioxide as a solvent, the chlorella extract produced by the method and processed food including the chlorella extracts, wherein the chlorella extract of the present invention can provide extracts with improved functionalities such as antioxidant activities, chlorophyll content and anti-cancer effects compared to chlorella extracts produced by existing methods.
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