This invention relates to a method for producing a plant extract, quantified on pinitol, wherein a plant Desmodium adscendens is selected from the Desmodium family, wherein a fraction is extracted from Desmodium plant parts, wherein a plant extract is derived from said fraction thereof, which is remarkable in that a characterised extract is derived from Desmodium adscendens, from which a preparation of said plant extract is quantified on pinitol.