This invention disclosed is a tangerine peel extract with the effect of weight gain. This extract uses tangerine peel as the raw ingredient and is obtained through extraction processes using supercritical CO2, water, or organic solvents. The resulting extraction component contains a large quantity of flavonoids and terpenoids, which can effectively regulate the function of the spleen and stomach leading to desired weight gain. This invention also declares the preparation methods of the above mentioned tangerine peel extraction, which is simple in technique and highly effective in extraction. This invention also further declares the application of the above mentioned tangerine peel extraction in preparing healthcare food with the function of gaining weight.
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